CN110895205B - On-spot calibration system of test bench flow measurement of aeroengine - Google Patents

On-spot calibration system of test bench flow measurement of aeroengine Download PDF

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Publication number
CN110895205B
CN110895205B CN201811059840.XA CN201811059840A CN110895205B CN 110895205 B CN110895205 B CN 110895205B CN 201811059840 A CN201811059840 A CN 201811059840A CN 110895205 B CN110895205 B CN 110895205B
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assembly
measurement
volume
valve
passive
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CN110895205A (en
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宋志强
杨水旺
黄相华
谭逢喜
高新方
李启明
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Beijing Zhenxing Metrology and Test Institute
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Beijing Zhenxing Metrology and Test Institute
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00Testing of engines
    • G01M15/14Testing gas-turbine engines or jet-propulsion engines

Abstract

The invention provides a flow measurement field calibration system for a test bed of an aerospace engine, which comprises a fuel supply unit, a turbine flowmeter assembly, an engine test bed, a measurement and control unit, a field calibration assembly and a volume tube checking assembly, wherein the field calibration assembly comprises a decompression unit, a degassing unit and a passive volume tube which are sequentially connected, the decompression unit is used for reducing the fuel pressure in a pipeline, the degassing unit is used for removing gas in fuel in the pipeline, the passive volume tube is used for acquiring the volume of flow in the pipeline so as to calibrate the turbine flowmeter assembly, and the volume tube checking assembly is used for checking the effective volume of the passive volume tube. By applying the technical scheme of the invention, the technical problem of low accuracy of field measurement of the engine flow caused by the influence of field environment factors such as pressure, bubbles, vibration and the like in the prior art is solved.

Description

On-spot calibration system of test bench flow measurement of aeroengine
Technical Field
The invention relates to the technical field of flow measurement, in particular to a field calibration system for flow measurement of a test bed of an aerospace engine.
Background
The ground simulation test of the test bed of the space engine is an important component of the engineering of a development system of the space engine, wherein the flow is one of important parameters for evaluating the function, the performance and the stability of the space engine. The accurate measurement of the flow is crucial to determining the performance of the space engine, the measured value is directly used for calculating main performance parameters such as thrust, mixing ratio and characteristic speed of the space engine, and is also a main basis for determining parameters such as the missile-borne propellant quantity, the missile storage tank volume and the like, and important indexes such as the working time of the space engine, the flying speed of a missile, the range and the like are determined, so that the flow measurement precision of a test bed of the space engine is higher and higher in recent years, and the requirement of the original common test bed for 1.0% flow precision is improved to 0.5%.
The existing test bed of the aerospace engine comprises a large number of flowmeters, the flowmeters are mainly turbine flowmeters, used media comprise kerosene, lubricating oil and the like, and the media enter a pipeline under the action of a fuel pump and high-pressure gas, so that the media contain a certain amount of impurities such as bubbles and the like, and the pipeline vibration exists during testing, so that the precision of a flow measurement system of the test bed of the aerospace engine is influenced. At present, the calibration work of a flow measurement system of a test bed of an aerospace engine is usually carried out in a laboratory, namely a flowmeter is disassembled and sent to the laboratory, but in the actual use process, the flow measured by the calibrated flowmeter is different from the actual flow, namely, the flowmeter with the accuracy grade of 0.5 is adopted, the error caused in the actual field use can be increased to +/-5% to +/-10%, the overlarge flow measurement error of the test bed of the aerospace engine is caused, the propellant quantity and the storage tank volume of the aerospace engine are influenced, and further the working time of the aerospace engine, the flying speed and the range of a missile are influenced. Meanwhile, the field test conditions are complex, the flowmeter is difficult to disassemble and transport, and the field calibration work of the flow measurement system is not carried out yet.
Moreover, the field test environment of the test bed of the aerospace engine is very severe, and the accuracy of the volume of the standard section of the passive volume tube in a source tracing period (3 years) can be reduced when the test bed of the aerospace engine works in the field test environment for a long time, so that the accuracy of the field calibration of the flow measurement of the test bed of the aerospace engine is reduced.
Disclosure of Invention
The invention provides a field calibration system for measuring flow of a test bed of an aerospace engine, which can solve the technical problems that in the prior art, the flow measurement accuracy of the aerospace engine is low and the volume precision of a standard section of a passive volume tube in a field test environment is reduced due to the influence of field environment factors of the test bed of the aerospace engine such as vibration, pressure, bubbles and the like.
According to an aspect of the present invention, there is provided an engine test bed flow measurement field calibration system, including: the fuel supply unit is used for supplying fuel to the engine test bed flow measurement field calibration system; the turbine flowmeter assembly is connected with the fuel supply unit pipeline and is used for measuring the flow in the pipeline; the system comprises an engine test bed and a measurement and control unit, wherein the engine test bed is connected with the measurement and control unit, and the measurement and control unit is used for acquiring flow data of the engine test bed and a turbine flowmeter assembly; the field calibration assembly comprises a pressure reduction unit, a degassing unit and a passive volume pipe which are sequentially connected, wherein the pressure reduction unit is used for reducing the pressure of fuel in a pipeline, the degassing unit is used for removing gas in the fuel in the pipeline, and the passive volume pipe is used for acquiring the volume of flow in the pipeline so as to calibrate the turbine flowmeter assembly; the volume tube checking assembly is used for checking the effective volume of the passive volume tube, and when the passive volume tube is checked, the volume tube checking assembly is connected with two ends of the passive volume tube; the turbine flowmeter assembly is selectively connected with a decompression unit in an engine test bed or a field calibration assembly, and when the field calibration system is in a normal test working state, the turbine flowmeter assembly is connected with the engine test bed; when the field calibration system is in a first measurement state, the turbine flowmeter assembly is connected with a pressure relief unit in the field calibration assembly, and the field calibration assembly is used for calibrating the turbine flowmeter assembly.
Further, the volumetric tube check assembly includes: the water storage tank is used for supplying and recovering water for checking the passive volume pipe; the first power unit is respectively connected with the water storage tank and the passive volume pipe and is used for inputting water in the water storage tank into the passive volume pipe; and the measuring component is respectively connected with the passive volume pipe and the water storage tank and is used for measuring the volume of the passive volume pipe.
Further, the measurement assembly includes: the first switch is connected with the passive volume tube; the commutator is connected with a first switch, and the first switch is used for controlling whether the passive type volume tube is communicated with the commutator; the volume tube checking assembly is used for checking the effective volume of the passive volume tube according to the standard volume provided by the main standard; and the second switch is arranged between the main standard device and the water storage tank and is used for controlling whether the main standard device is communicated with the water storage tank or not.
Further, the volume tube check assembly includes a plurality of measurement assemblies having different measurement volumes, and the passive volume tube is selectively connectable to any one of the plurality of measurement assemblies.
Further, the on-site calibration system further comprises a cleaning system, the cleaning system is used for cleaning the on-site calibration assembly when the fuel medium in the pipeline is replaced, and when the on-site calibration system is in a cleaning state, the cleaning system is connected with two ends of the passive volume pipe in the on-site calibration assembly.
Further, the cleaning system comprises a cleaning assembly, wherein the cleaning assembly is used for storing liquid for cleaning the on-site calibration assembly; the first valve component and the second valve component are used for opening or closing the cleaning component, the first valve component and the second valve component are respectively connected with two ends of the cleaning component, and when the field calibration system is in a cleaning state, the second valve component is connected with the passive volume pipe in the field calibration component; and the second power unit is used for inputting the liquid in the cleaning assembly into the passive volume pipe, is connected with the first valve assembly, and is connected with the passive volume pipe in the field calibration assembly when the field calibration system is in a cleaning state.
The field calibration assembly further comprises a mass flow meter and an electric switch valve, the mass flow meter is used for measuring the mass flow of fuel in a pipeline of the field calibration assembly, the electric switch valve is used for controlling the opening and closing of the fuel in the pipeline of the field calibration assembly, the mass flow meter is respectively connected with the electric switch valve and the passive volume pipe, when the field calibration system is in a first measurement state, the electric switch valve is connected with the degassing unit, when the field calibration system is in a volume pipe checking state, the electric switch valve is connected with a first power unit in the volume pipe checking assembly, and when the field calibration system is in a cleaning state, the electric switch valve is connected with a second power unit in the cleaning system; the electric control valve is used for controlling the flow of fuel in the pipeline and is connected with the passive volume pipe, when the field calibration system is in a first measurement state, the electric control valve is connected with the fuel supply unit, when the field calibration system is in a volume pipe checking state, the electric control valve is connected with a first switch in the volume pipe checking assembly, and when the field calibration system is in a cleaning state, the electric control valve is connected with the cleaning system.
Furthermore, the field calibration assembly further comprises a numerical control system, the numerical control system is respectively connected with the passive volume pipe and the turbine flowmeter assembly to acquire data of the passive volume pipe and the turbine flowmeter assembly, and the field calibration assembly calibrates the turbine flowmeter assembly according to the acquired data.
Furthermore, the field calibration system also has a second measurement state, and when the field calibration system is in the second measurement state, the field calibration component is connected with the measurement and control unit so as to calibrate the measurement and control unit.
Furthermore, the numerical control system also comprises a signal sending unit, the signal sending unit is connected with the measurement and control unit, and when the field calibration system is in a second measurement state, the signal sending unit sends a measurement signal to the measurement and control unit so as to calibrate the measurement and control unit.
By applying the technical scheme of the invention, the field calibration of the turbine flowmeter assembly is realized through the field calibration assembly, the influence of pressure on the flow measurement of the test bed of the aerospace engine is effectively reduced or eliminated by arranging the decompression unit in the field calibration system, the influence of bubbles on the flow measurement of the test bed of the aerospace engine is effectively reduced or eliminated by arranging the air elimination unit in the field calibration system, the accuracy of the flow measurement of the test bed of the aerospace engine is improved by arranging the passive volume tube, the passive volume tube has higher flow measurement precision, the performance is more stable when the test is carried out under the environmental conditions of pressure and vibration, and the influence of the pressure and the vibration on the flow measurement of the test bed of the aerospace engine is effectively reduced. The mode can effectively reduce or eliminate the influence of environmental factors such as pressure, bubbles and vibration on the flow measurement of the test bed of the space engine, realizes the calibration of a turbine flowmeter and a measurement and control unit in the flow measurement system of the test bed of the space engine, and effectively improves the flow measurement precision of the test bed of the space engine. Moreover, through setting up the volume pipe and checking the subassembly, can realize regularly checking passive formula volume pipe standard volume, prevent that passive formula volume pipe from measuring accuracy reduces under site environment's influence, further improve the degree of accuracy of on-the-spot calibration system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 shows a system block diagram of an aerospace engine test bed flow measurement field calibration system provided in accordance with a specific embodiment of the invention;
FIG. 2 is a schematic structural diagram illustrating a field calibration system for flow measurement of a test bed of an aerospace engine provided in accordance with an embodiment of the invention;
FIG. 3 is a schematic structural diagram illustrating a volumetric tube checking assembly of a flow measurement field calibration system of an aerospace engine test bed according to an embodiment of the invention;
FIG. 4 is a schematic structural diagram illustrating a cleaning system of a field calibration system for flow measurement of a test bed of an aerospace engine provided in accordance with an embodiment of the invention;
FIG. 5 is a schematic diagram illustrating two measurement states of an on-site calibration system for flow measurement of an aircraft engine test bed according to an embodiment of the invention;
FIG. 6 is a schematic diagram illustrating a calibration of a measurement and control unit according to an embodiment of the present invention;
FIG. 7 illustrates a schematic structural view of a turbine flow meter assembly provided in accordance with a specific embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a fuel supply unit; 20. a turbine flow meter assembly; 30. an engine test bed; 40. a measurement and control unit; 50. a field calibration component; 51. a pressure reducing unit; 52. a degassing unit; 53. a passive volume tube; 54. a mass flow meter; 55. an electrically operated on-off valve; 56. an electric control valve; 57. a numerical control system; 60. a volume tube check component; 61. a water storage tank; 62. a first power unit; 63. a measurement assembly; 631. a first switch; 632. a commutator; 633. a master etalon; 634. a second switch; 70. cleaning the system; 71. cleaning the assembly; 72. a first valve assembly; 73. a second valve component; 74. a second power unit.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
As shown in fig. 1 to 7, according to an embodiment of the present invention, an on-site calibration system for measuring flow rate of an aerospace engine test bed is provided, and includes a fuel supply unit 10, a turbine flow meter assembly 20, an engine test bed 30, a measurement and control unit 40, an on-site calibration assembly 50, and a volumetric tube checking assembly 60. The fuel supply unit 10 is used for supplying fuel for the on-site calibration system for measuring the flow of the engine test bed, the turbine flowmeter assembly 20 is connected with the fuel supply unit 10 in a pipeline, the turbine flowmeter assembly 20 is used for measuring the flow in the pipeline, the engine test bed 30 is connected with the measurement and control unit 40, the measurement and control unit 40 is used for collecting the flow data of the engine test bed 30 and the turbine flowmeter assembly 20, the on-site calibration assembly 50 comprises a decompression unit 51, a degassing unit 52 and a passive volume pipe 53 which are sequentially connected, the decompression unit 51 is used for reducing the fuel pressure in the pipeline, the degassing unit 52 is used for removing gas in the fuel in the pipeline, the passive volume pipe 53 is used for collecting the volume of the flow in the pipeline for calibrating the turbine flowmeter assembly 20, the volume pipe check assembly 60 is used for checking the effective volume of the passive volume pipe 53, when the volume check is carried out on the passive volume pipe 53, the volumetric tube checking assembly 60 is connected to both ends of the passive volumetric tube 53. The turbine flowmeter assembly 20 is selectively connected with the decompression unit 51 in the engine test bed 30 or the field calibration assembly 50, the turbine flowmeter assembly 20 is connected with the engine test bed 30 when the field calibration system is in a normal test running working state, the turbine flowmeter assembly 20 is connected with the decompression unit 51 in the field calibration assembly 50 when the field calibration system is in a first measurement state, and the field calibration assembly 50 is used for calibrating the turbine flowmeter assembly 20.
By applying the configuration mode, the field calibration of the turbine flowmeter assembly 20 is realized through the field calibration assembly 50, the influence of pressure on the flow measurement of the test bed of the aerospace engine is effectively reduced or eliminated by arranging the decompression unit 51 in the field calibration system, the influence of bubbles on the flow measurement of the test bed of the aerospace engine is effectively reduced or eliminated by arranging the air elimination unit 52 in the field calibration system, the flow measurement accuracy of the test bed of the aerospace engine is improved by arranging the passive volume tube 53, the passive volume tube 53 has higher flow measurement precision, the measurement performance is more stable under the environmental conditions of pressure and vibration, and the influence of the pressure and the vibration on the flow measurement of the test bed of the aerospace engine is effectively reduced. Compared with the prior art, the on-site calibration system provided by the invention can effectively reduce or eliminate the influence of environmental factors such as pressure, bubbles and vibration on the flow measurement of the test bed of the aerospace engine, realizes the calibration of the turbine flowmeter in the flow measurement system of the test bed of the aerospace engine, and effectively improves the flow measurement precision of the test bed of the aerospace engine. Furthermore, by providing the volume tube checking assembly 60, the standard volume of the passive volume tube 53 can be periodically checked, so that the passive volume tube 53 is prevented from being reduced in measurement precision under the influence of the field environment, the reliability of quantity value transmission is improved, and the accuracy of the field calibration system is further improved.
As an embodiment of the present invention, the pressure reducing unit 51 is a pressure reducing valve, and the degassing unit 52 is a degassing filter, and when the fuel flows through the pressure reducing valve, the pressure reducing valve reduces the pressure of the high-pressure fuel in the pipeline to below 3MP, and the pressure reduction is favorable for the precipitation of bubbles and the protection of the passive volume pipe 53. The degassing filter separates gas in the medium, thereby achieving the purpose of reducing or eliminating the influence of bubbles on the flow measurement of the test bed of the space engine.
Further, as shown in fig. 3, in order to realize the volume check of the passive volume pipe 53 by the volumetric method, the volume pipe checking assembly 60 may be configured as a water storage tank 61, a first power unit 62, and a measuring assembly 63, wherein the water storage tank 61 is used for supplying and recovering water for checking the passive volume pipe 53, the first power unit 62 is connected to the water storage tank 61 and the passive volume pipe 53, respectively, the first power unit 62 is used for inputting the water in the water storage tank 61 into the passive volume pipe 53, the measuring assembly 63 is connected to the passive volume pipe 53 and the water storage tank 61, respectively, and the measuring assembly 63 is used for measuring the volume of the passive volume pipe 53.
With this arrangement, the first power unit 62 drives the water in the water storage tank 61 into the pressure stabilizing system and then enters the passive volume pipe 53, the passive volume pipe 53 starts to operate normally, the water in the passive volume pipe 53 flows into the measuring component 63, and the standard volume of the passive volume pipe 53 is checked according to the volume calculated by the measuring component 63. As an embodiment of the present invention, a first circulation pump may be used as the first power unit 62, and water in the water storage tank 61 is supplied to the passive type volume pipe 53 by the first circulation pump in the process of checking the volume pipe by the volume method, by which the automation and the working efficiency of the system can be effectively improved.
Further, as shown in fig. 3, in order to improve the measurement accuracy of the volumetric tube checking process, the measuring assembly 63 may be configured as a first switch 631, a commutator 632, a main standard 633 and a second switch 634, wherein the first switch 631 is connected to the passive volumetric tube 53, the commutator 632 is connected to the first switch 631, the first switch 631 is used to control whether the passive volumetric tube 53 and the commutator 632 are communicated, the main standard 633 is connected to the commutator 632, the main standard 633 is used to provide a standard volume, the volumetric tube checking assembly 60 checks the effective volume of the passive volumetric tube 53 according to the standard volume provided by the main standard 633, the second switch 634 is disposed between the main standard 633 and the water storage tank 61, and the second switch 634 is used to control whether the main standard 633 and the water storage tank 61 are communicated.
With this configuration, when the passive volume pipe 53 is checked, the second switch 634 is turned off, the first switch 631 and the first power unit 62 are turned on, the first power unit 62 inputs water in the water storage tank 61 into the passive volume pipe 53, the passive volume pipe 53 starts to operate normally, water in the passive volume pipe 53 flows through the first switch 631 and flows into the main standard 633 through the diverter 632, when the passive volume pipe 53 stops operating, the first switch 631 is turned off, the volume of the passive volume pipe 53 is checked according to the volume of water in the main standard 633, and after the check is completed, the second switch 634 is turned on to return water in the main standard 633 to the water storage tank 61.
As a specific embodiment of the present invention, a standard metal measuring device may be used as the main standard 633, the volume of the passive volume tube 53 may be checked by a difference between the liquid volume in the standard metal measuring device and the standard volume of the passive volume tube 53, in the process of checking the standard volume of the volume tube, an error caused by temperature, pressure and other factors needs to be corrected by a volume tube volume formula, and in the process of field calibration, the volume tube volume may also be corrected and compensated by the formula, where the volume tube volume formula is:
Figure BDA0001796770990000101
wherein VpsIs the volume value of the volume tube in the standard state and has the unit of L and VsIs a standard indicator value with the unit of L, betasThe coefficient of volume expansion of the material of the standard gauge is expressed by the unit of 1/DEG C, betawIs the volume expansion coefficient of water, with the unit of 1/DEG C, ts,tp,trRespectively, the standard gauge, the wall temperature of the volume tube, and the temperature at the measuring rod, in degrees Celsius, ppIs the gauge pressure of the liquid in the volume tube, and has the unit Pa, D is the nominal inner diameter of the volume tube, and has the unit m, E is the elastic modulus of the material of the volume tube, and has the unit Pa, D is the wall thickness of the volume tube, and has the unit m, alphapThe linear expansion coefficient of the material of the volume tube is 1/DEG C, alpharThe linear expansion coefficient of the material of the measuring rod is measured, and the unit is 1/DEG C, FwIs the compressibility factor of water, in unitsThe standard volume of the passive volume pipe 53 can be calculated more accurately by adopting the method at 1/Pa, so that the accuracy of the volume check of the passive volume pipe 53 is improved, and the measurement precision of a flow measurement field calibration system is improved.
Further, as shown in fig. 3, in order to satisfy the capability of checking the volume of the passive volume tube 53 having various standard volumes, the volume tube checking assembly 60 includes a plurality of measuring assemblies 63, the measuring assemblies 63 have different measuring volumes, and the passive volume tube 53 is selectively connected to any one of the measuring assemblies 63.
With this arrangement, when the volume of the passive volume tube 53 is checked, different measuring units 63 can be selected according to the volume of the passive volume tube 53 for the volume check. As an embodiment of the present invention, the volumetric tube checking assembly 60 includes three measuring assemblies 63, the first measuring assembly includes a first switch, a first commutator, a 5L standard metal measuring device, and a second switch, the second measuring assembly includes a third switch, the second commutator, a 20L standard metal measuring device, and a fourth switch, and the third measuring assembly includes a fifth switch, a third commutator, a 36L standard metal measuring device, and a sixth switch. When the passive type volume pipe with the standard volume of 5L is checked, the second switch is closed, the first switch and the first circulating pump are opened, the first circulating pump inputs water in the water storage tank 61 into the passive type volume pipe 53, the passive type volume pipe 53 starts to work normally, water in the passive type volume pipe 53 flows into the 5L standard metal measuring device through the first switch and the first commutator, when the passive type volume pipe 53 stops working, the first switch is closed, the volume of the passive type volume pipe 53 is checked according to the volume of the water in the 5L standard metal measuring device, and after checking is finished, the second switch is opened to enable the water in the 5L standard metal measuring device to flow back to the water storage tank 61.
When the passive type volume pipe with the standard volume of 20L is checked, the fourth switch is closed, the third switch and the first circulating pump are opened, the first circulating pump inputs water in the water storage tank 61 into the passive type volume pipe 53, the passive type volume pipe 53 starts to work normally, water in the passive type volume pipe 53 flows into the 20L standard metal measuring device through the third switch and the second commutator, when the passive type volume pipe 53 stops working, the third switch is closed, the volume of the passive type volume pipe 53 is checked according to the volume of the water in the 20L standard metal measuring device, and after the checking is finished, the fourth switch is opened to enable the water in the 20L standard metal measuring device to flow back to the water storage tank 61.
When the passive type volume pipe with the standard volume of 36L is checked, the sixth switch is closed, the fifth switch and the first circulating pump are opened, the first circulating pump inputs water in the water storage tank 61 into the passive type volume pipe 53, the passive type volume pipe 53 starts to work normally, water in the passive type volume pipe 53 flows into the 36L standard metal measuring device through the fifth switch and the third reverser, when the passive type volume pipe 53 stops working, the fifth switch is closed, the volume of the passive type volume pipe 53 is checked according to the volume of the water in the 36L standard metal measuring device, and after the check is finished, the sixth switch is opened to enable the water in the 36L standard metal measuring device to flow back to the water storage tank 61.
In addition, in order to make the structure more compact, the second and third commutators may be set as the same commutator, and the third and fifth switches may be set as the same switch. This kind of mode can realize carrying out the volume to the passive form volume pipe 53 of different standard volumes and check, has avoided changing measurement element 63 when carrying out the volume to different volume passive form volume pipes 53 and check, and is easy and simple to handle and has improved work efficiency.
Further, to clean the in-situ calibration system, the in-situ calibration system further comprises a cleaning system 70, the cleaning system 70 being adapted to clean the in-situ calibration assembly 50 when the fuel medium in the pipeline is replaced, the cleaning system 70 being adapted to connect to both ends of the passive volume tube 53 in the in-situ calibration assembly 50 when the in-situ calibration system is in a cleaning state. By adopting the configuration mode, the cleaning system 70 is arranged to clean the field calibration system when the medium is replaced, and the mode can prevent various media from polluting the calibration system and further improve the accuracy of the field calibration system.
Further, as shown in FIG. 4, to open and close the purge system 70 and to transfer the fluid in the purge system 70 into the passive volume tube 53 of the in situ calibration assembly 50, the cleaning system 70 may be configured as a cleaning assembly 71, a first valve assembly 72, a second valve assembly 73 and a second power unit 74, wherein, the first valve component 72 and the second valve component 73 are used for opening or closing the cleaning component 71, the first valve component 72 and the second valve component 73 are respectively arranged at two ends of the cleaning component 71, when the field calibration system is in the purge state, the purge assembly 71 is connected to one end of the passive volume tube 53 through the first valve assembly 72 and to the other end of the passive volume tube 53 through the second valve assembly 73, the second power unit 74 is disposed between the first valve assembly 72 and one end of the passive volume tube 53, and the second power unit 74 is used to transfer the liquid in the purge assembly 71 into the passive volume tube 53.
With this arrangement, when cleaning the field calibration assembly 50, the first valve assembly 72 and the second valve assembly 73 are opened, the second power unit 74 sends the fluid in the cleaning system 70 to the field calibration assembly 50, and the passive volume tube 53 reciprocates for cleaning.
Further, as shown in fig. 4, in order to clean the residual oily medium in the field calibration assembly 50, the cleaning assembly 71 includes a cleaning agent tank, the first valve assembly 72 includes a first valve, and the second valve assembly 73 includes a second valve, wherein the first valve, the cleaning agent tank, and the second valve are sequentially arranged in series, the cleaning agent tank is used for storing cleaning agent, and the first valve, the second valve are used for controlling the opening and closing of the cleaning agent tank.
With this arrangement, when cleaning the field calibration assembly 50, the first and second valves are opened, the second power unit 74 delivers the cleaning agent in the cleaning agent tank to the field calibration assembly 50, and the passive volume tube 53 reciprocates for cleaning. As an embodiment of the present invention, the second power unit 74 is a second circulation pump having a power of 1kw, a head of 30m, and a volume of 1m for the cleaning agent tank3The cleaning agent box body is a water-based metal cleaning agent, has the advantages of good decontamination and oil removal effects, no damage to cleaning workpieces, no corrosion, no flash point, no combustion and explosion, no toxicity and no harm and the like, and can effectively carry out oil medium treatment on metalAnd (5) cleaning.
Further, as shown in fig. 4, in order to clean the cleaning agent remaining in the field calibration assembly 50 and determine the clean degree of the cleaning agent, and to clean the fuel media such as alcohol dissolved in water, the cleaning assembly 71 further includes a water tank, the first valve assembly 72 further includes a third valve, the second valve assembly 73 further includes a fourth valve, the third valve, the water tank and the fourth valve are sequentially connected in series, the water tank is connected in parallel with the cleaning agent tank, the water tank is used for storing water for cleaning, and the third valve and the fourth valve are used for controlling the opening and closing of the water tank.
With this arrangement, when the field calibration unit 50 is cleaned, the third valve and the fourth valve are opened, the second power unit 74 sends the cleaning water in the water tank to the field calibration unit 50, and the passive volume pipe 53 reciprocates for cleaning. As an embodiment of the present invention, the water tank has a volume of 1m3The water tank can be directly cleaned by water for the medium of which the fuel medium is alcohol before the medium is replaced, and the medium of which the fuel medium is oil such as kerosene and the like before the medium is replaced can be cleaned by the cleaning agent and then cleaned again by the water in the water tank, so that the on-site calibration assembly 50 can be cleaned more thoroughly, the residues of the fuel medium such as alcohol and the cleaning agent in the on-site calibration assembly 50 are avoided, and meanwhile, whether the cleaning agent meets the requirement on the on-site calibration assembly 50 can be judged by observing whether the water tank contains an oil film or not.
Further, as shown in fig. 4, in order to further improve the accuracy of the measurement of the on-site calibration system after the fuel medium is replaced, the cleaning assembly 71 further includes a medium tank, the first valve assembly 72 further includes a fifth valve, the second valve assembly 73 further includes a sixth valve, the fifth valve, the medium tank and the sixth valve are sequentially arranged in series, the medium tank is respectively arranged in parallel with the water tank and the cleaning agent tank, the medium tank is used for storing the replaced fuel medium, and the fifth valve and the sixth valve are used for controlling the opening and closing of the medium tank.
With this arrangement, the fifth and sixth valves are opened during cleaning of the field calibration assembly 50The fuel medium in the medium tank is stored after replacement, the second power unit 74 feeds the fuel medium in the medium tank into the field calibration assembly 50, and the passive volume tube 53 reciprocates for cleaning. As an embodiment of the present invention, the medium tank has a volume of 1m3The medium box can effectively prevent liquid of different fuel media required by the next test from remaining in the field calibration assembly 50, and further improves the measurement precision of the field calibration system.
Further, as shown in fig. 1, in order to correct the influence of bubbles and adjust the flow rate in the on-site pipeline of the test bed of the space engine, the on-site calibration assembly 50 further includes a mass flow meter 54, an electric switch valve 55 and an electric control valve 56, wherein the mass flow meter 54 is used for measuring the mass flow rate of the fuel in the on-site calibration assembly 50, the electric switch valve 55 is used for controlling the on-off of the fuel in the on-site calibration assembly 50, the mass flow meter 54 is respectively connected with the electric switch valve 55 and the passive volume tube 53, when the on-site calibration system is in a first measurement state, the electric switch valve 55 is connected with the air elimination unit 52, when the on-site calibration system is in a volume tube check state, the electric switch valve 55 is connected with the first power unit 62 in the volume tube check assembly 60, when the on-site calibration system is in a cleaning state, the electric switch valve 55 is connected with the second power unit 74 in the cleaning system 70, the electrical control valve 56 is used for controlling the flow rate of fuel in the pipeline, the electrical control valve 56 is connected to the passive volume pipe 53, the electrical control valve 56 is connected to the fuel supply unit 10 when the on-site calibration system is in the first measurement state, the electrical control valve 56 is connected to the first switch 631 in the volume pipe check module 60 when the on-site calibration system is in the volume pipe check state, and the electrical control valve 56 is connected to the second valve assembly 73 in the purge system 70 when the on-site calibration system is in the purge state.
By applying the configuration mode, the mass flow of the fuel measured by the mass flow meter 54 corrects the measured volume of the passive volume pipe 53 of the on-site calibration system so as to reduce the influence of bubbles, the flow in the on-site calibration system is controlled by the electric switch valve 55 and the electric regulating valve 56 so as to provide back pressure for the on-site calibration assembly 50, thereby being beneficial to the smooth movement of the piston of the passive volume pipe 53, preventing cavitation and further reducing the influence of bubbles on flow measurement. Further, the mass flow meter 54 may estimate the flow in the pipeline prior to the actual flow measurement, so as to select a specific mass flow calibration point for calibrating the turbine flowmeter assembly 20. This approach enables the turbine meter assembly 20 to be calibrated at selected flow calibration points by estimating the fuel flow in the pipeline.
Further, as shown in fig. 1, in order to further improve the accuracy of the on-site calibration system for measuring flow of the test bed of the aerospace engine, the on-site calibration assembly 50 further includes a numerical control system 57, the numerical control system 57 is respectively connected to the passive volume pipe 53 and the turbine flowmeter assembly 20 to acquire data of the passive volume pipe 53 and the turbine flowmeter assembly 20, and the on-site calibration assembly 50 calibrates the turbine flowmeter assembly 20 according to the acquired data.
By adopting the configuration mode, the numerical control system 57 controls the electric switch valve 55 and the electric regulating valve 56 of the calibration system for the flow measurement field of the test bed of the engine, and the calibration system for the flow measurement field of the test bed of the aerospace engine is controlled in an automatic mode. Furthermore, the time corresponding to the standard volume of the fuel flowing through the passive volume pipe 53 is obtained by measuring the photoelectric switch signal of the passive volume pipe 53 through the numerical control system 57, so that the volume flow of the engine test bed is measured, and the flow measured by the passive volume pipe 53 is compared with the flow measured by the turbine flowmeter assembly 20 to calibrate the turbine flowmeter assembly 20. In addition, the numerical control system 57 can measure the pressure and the temperature in the passive volume tube 53, and the measurement state of the calibration system for the flow measurement field of the engine test bed can be monitored in such a way.
Further, as shown in fig. 5, in order to avoid that the field test channel of the flow collection and processing system of the test bed of the aerospace engine is long, and the influence of environmental factors causes drift and error to the flow collection and processing channel, the field calibration system further has a second measurement state, and when the field calibration system is in the second measurement state, the field calibration component 50 is connected with the measurement and control unit 40 to calibrate the measurement and control unit 40.
By applying the configuration mode, the measurement and control unit 40 is calibrated by sending a standard frequency signal by the measurement and control unit 40 of the field calibration assembly 50, so that the problem that the measurement and control unit 40 of the engine test bed cannot be calibrated due to incapability of being detached is solved, and a flow measurement result with higher precision can be obtained by testing and calibrating the rear-end acquisition channel of the turbine flowmeter assembly 20.
Further, as shown in fig. 6, in order to simulate the frequency signal output by the turbine flowmeter assembly 20 to calibrate the measurement and control unit 40, the numerical control system 57 further includes a signal sending unit, the signal sending unit is connected with the measurement and control unit 40, and when the field calibration system is in the second measurement state, the signal sending unit sends a measurement signal to the measurement and control unit 40 so as to calibrate the measurement and control unit 40.
As a specific embodiment of the present invention, a function generator may be used as the signal sending unit, the measurement and control unit 40 includes a data acquisition system and a computer/secondary meter, during the calibration process of the measurement and control unit 40, the function generator generates a standard frequency signal to simulate a frequency signal output by the turbine flowmeter assembly 20, and the standard frequency signal enters the data acquisition system of the measurement and control unit 40 and displays a flow value through the computer/secondary meter. The method comprises the steps of selecting calibration points for calibration when the turbine flowmeter assembly 20 is calibrated to obtain a relationship between frequency and flow, obtaining a conversion relationship between the frequency and the flow of each calibration point through least square fitting, and comparing the relationship between the frequency and the flow measured by the measurement and control unit 40 with a flow real value corresponding to the frequency sent by the function generator to obtain errors of each measurement channel. Moreover, a sectional calibration compensation mode is adopted to compensate the rear-end processing system of the turbine flowmeter assembly 20, the computer/secondary instrument coefficient of the calibration section calibration measurement and control unit 40 is divided according to requirements, and the compensation calibration is carried out on a flowmeter rear-end channel.
Further, in order to reduce the influence of pressure and vibration on the test bed flow measurement field calibration system, the pressure reduction unit 51, the air elimination unit 52, the electric switch valve 55, the mass flow meter 54, the passive volume tube 53, and the electric control valve 56 are connected in sequence through a metal bellows hose. By applying the configuration mode, the influence of pressure on the test bed flow field calibration system can be reduced by utilizing the pressure resistance of the metal corrugated hose, and the influence of a field vibration environment on the test bed flow measurement accuracy can be prevented by adopting the flexible connection of the metal corrugated hose between any two adjacent parts in the field calibration assembly. Moreover, the corrugated metal hose can prevent the influence of whole pipeline expend with heat and contract with cold deformation to the pipe connection, and this kind of mode can reduce pressure, vibration, temperature effectively to the influence of test bed flow measurement precision.
Further, as shown in fig. 7, in order to enable the on-site calibration system for flow measurement of test bed of the aerospace engine to be suitable for calibration of different flow ranges, the turbine flowmeter assembly 20 is configured to be a plurality of turbine flowmeters, a plurality of switch valves and a plurality of regulating valves, the plurality of turbine flowmeters, the plurality of switch valves and the plurality of regulating valves are correspondingly arranged, and the flow ranges of the plurality of turbine flowmeters are different. The turbine flowmeter assembly 20 is connected to the engine test bed 30 via a metal bellows when the field calibration system is in a normal operating condition, and the turbine flowmeter is connected to the field calibration assembly 50 via a metal bellows when the field calibration system is in a first measurement condition.
By applying the configuration mode, the calibration system for the flow measurement field of the test bed of the aerospace engine is suitable for measurement and calibration in a plurality of flow ranges by arranging a plurality of turbine flowmeters with different models, a plurality of switch valves and a plurality of regulating valves. As a specific embodiment of the present invention, when the working pressure is below 3MPa, the turbine flowmeter assembly 20 is configured with four turbine flowmeters with different flow measurement ranges, the first turbine flowmeter can be selected to achieve flow measurement and calibration within the flow range of 0.95L/min to 100L/min, the second turbine flowmeter can be selected to achieve flow measurement and calibration within the flow range of 100L/min to 250L/min, the third turbine flowmeter can be selected to achieve flow measurement and calibration within the flow range of 250L/min to 400L/min, the fourth turbine flowmeter can be selected to achieve flow measurement and calibration within the flow range of 400L/min to 570L/min, according to the mode, the turbine flow meters in different flow ranges are selected, so that the flow measurement and calibration in the flow range of 0.95L/min to 570L/min can be realized.
Furthermore, the two ends of the metal corrugated hose are in threaded connection, so that the corrugated hose connection between the turbine flowmeter assembly 20 and the engine test bed 30 can be disconnected under the condition that an engine test bed test is not carried out, the turbine flowmeter assembly 20 and the field calibration assembly 50 are connected through the corrugated hose, and the mode provides convenience for the access of the field calibration assembly 50, is simple and convenient to operate and is high in efficiency.
For further understanding of the present invention, the on-site calibration system for flow measurement of test bed of an aerospace engine according to the present invention will be described in detail with reference to fig. 1 to 7.
As shown in fig. 1 to 7, the flow measurement field calibration system includes a fuel supply unit 10, a turbine flowmeter assembly 20, an engine test bed 30, a measurement and control unit 40, a field calibration assembly 50, a volume tube checking assembly 60, and a cleaning system 70, wherein the fuel power station serves as the fuel supply unit 10, and during operation, the fuel power station delivers fuel to each pipeline, the fuel is fuel oil, wherein the turbine flowmeter assembly 20 includes a plurality of turbine flowmeters, a plurality of switching valves, and a plurality of regulating valves, and by providing a plurality of turbine flowmeters, a plurality of switching valves, and a plurality of regulating valves, the turbine flowmeter assembly 20 can realize flow measurement in a range of 0.95L/min to 570L/min, the engine test bed 30 is connected with the measurement and control unit 40, and the measurement and control unit 40 includes a data acquisition system and a computer/secondary meter, wherein the data acquisition system is used for acquiring flow data of the engine test bed 30 and the turbine flowmeter assembly 20, a computer/secondary meter is used to display the measured flow.
The field calibration assembly 50 comprises a pressure reduction unit 51, an air elimination unit 52, an electric switch valve 55, a mass flow meter 54, a passive volume pipe 53 and an electric regulating valve 56 which are sequentially connected by a corrugated metal hose, wherein the passive volume pipe 53 is made of 304 stainless steel materials, the passive volume pipe 53 comprises a piston and a cylinder body, the piston and the cylinder body are sealed by a flooding plug, and the contact part between the flooding plug and the cylinder body is made of nitrile rubber. Wherein the electrical on-off valve 55 is selectively connected to the air-bleeding unit 52 and one end of the purge system 70, the electrical on-off valve 55 is connected to the air-bleeding unit 52 when the on-site calibration system is in the first measurement state, the electrical on-off valve 55 is connected to the first power unit 62 of the volumetric tube check assembly 60 when the on-site calibration system is in the volume tube check state, the electrical on-off valve 55 is connected to the second power unit 74 of the purge system 70 when the on-site calibration system is in the purge state, the electrical control valve 56 is connected to the passive volumetric tube 53, the electrical control valve 56 is connected to the fuel supply unit 10 when the on-site calibration system is in the first measurement state, the electrical control valve 56 is connected to the first switch 631 of the volumetric tube check assembly 60 when the on-site calibration system is in the volume tube check state, and the cleaning system is in the purge state, the electric control valve 56 is connected to the second valve assembly 73 of the purge system 70, and the electric control valve 56 is used to control the amount of fuel flow in the line. A pressure reducing valve can be used as the pressure reducing unit 51, an air elimination filter can be used as the air elimination unit 52, the pressure reducing valve can reduce the pressure of high-pressure fuel oil in a pipeline to be lower than 3MPa, the reduction of the pressure is beneficial to the precipitation of air bubbles, and meanwhile, the passive volume pipe 53 is also protected. The degassing filter is used for separating gas in fuel oil, the electric switch valve 55 is used for controlling the opening and closing of the fuel oil in the pipeline of the field calibration assembly 50, and the mass flow meter 54 is used for measuring the mass flow of the fuel in the pipeline of the field calibration assembly 50 so as to further correct the influence of bubbles on the test bed flow measurement field calibration system and estimate the test bed flow before calibration test.
The turbine flowmeter assembly 20 is selectively connected to a pressure relief valve in the engine test bed 30 or the field calibration assembly 50, and the turbine flowmeter assembly 20 is connected to the engine test bed 30 through a metal bellows when the field calibration system is in a normal test operation state. When the field calibration system is in the first measurement state, the turbine flowmeter assembly 20 is connected to the pressure reducing valve in the field calibration assembly 50 through a metal bellows, and the field calibration assembly 50 is used to calibrate the turbine flowmeter assembly 20. The field calibration system also has a second measurement state, and when the field calibration system is in the second measurement state, the field calibration component 50 is connected to the measurement and control unit 40 to calibrate the measurement and control unit 40.
As shown in fig. 1 and fig. 6, the field calibration assembly 50 further includes a numerical control system 57, wherein the numerical control system 57 includes a signal transmission unit, a function generator can be used as the signal transmission unit, the function generator generates a standard frequency signal to simulate a frequency signal output by the turbine flowmeter assembly 20, and the standard frequency signal enters a data acquisition system of the measurement and control unit 40 and displays a flow value through a computer/secondary meter. The method comprises the steps of selecting calibration points for calibration when the turbine flowmeter assembly 20 is calibrated to obtain a relationship between frequency and flow, obtaining a conversion relationship between the frequency and the flow of each calibration point through least square fitting, and comparing the relationship between the frequency and the flow measured by the measurement and control unit 40 with a flow real value corresponding to the frequency sent by the function generator to obtain errors of each measurement channel. Moreover, a sectional calibration compensation mode is adopted to compensate the rear-end processing system of the turbine flowmeter assembly 20, the computer/secondary instrument coefficient of the calibration section calibration measurement and control unit 40 is divided according to requirements, the compensation calibration is carried out on the rear-end channel of the flowmeter, and the accuracy of the calibration system on the flow measurement site of the test bed of the space engine is improved.
The volume tube checking assembly 60 comprises a water storage tank 61, a first power unit 62 and three measuring assemblies 63, a first circulating pump can be adopted as the first power unit 62, a standard metal measuring device is adopted as the main standard device 633, the first measuring assembly comprises a first switch, a first commutator, a 5L standard metal measuring device, a second switch, the second measuring assembly comprises a third switch, a second commutator, a 20L standard metal measuring device, a fourth switch, the third measuring assembly comprises a fifth switch, a third commutator, a 36L standard metal measuring device and a sixth switch. When the passive type volume pipe with the standard volume of 5L is checked, the second switch is closed, the first switch and the first circulating pump are opened, the first circulating pump inputs water in the water storage tank 61 into the passive type volume pipe 53, the passive type volume pipe 53 starts to work normally, water in the passive type volume pipe 53 flows into the 5L standard metal measuring device through the first switch and the first commutator, when the passive type volume pipe 53 stops working, the first switch is closed, the volume of the passive type volume pipe 53 is checked according to the volume of the water in the 5L standard metal measuring device, and after checking is finished, the second switch is opened to enable the water in the 5L standard metal measuring device to flow back to the water storage tank 61. When the passive type volume pipe with the standard volume of 20L is checked, the fourth switch is closed, the third switch and the first circulating pump are opened, the first circulating pump inputs water in the water storage tank 61 into the passive type volume pipe 53, the passive type volume pipe 53 starts to work normally, water in the passive type volume pipe 53 flows into the 20L standard metal measuring device through the third switch and the second commutator, when the passive type volume pipe 53 stops working, the third switch is closed, the volume of the passive type volume pipe 53 is checked according to the volume of the water in the 20L standard metal measuring device, and after the checking is finished, the fourth switch is opened to enable the water in the 20L standard metal measuring device to flow back to the water storage tank 61. When the passive type volume pipe with the standard volume of 36L is checked, the sixth switch is closed, the fifth switch and the first circulating pump are opened, the first circulating pump inputs water in the water storage tank 61 into the passive type volume pipe 53, the passive type volume pipe 53 starts to work normally, water in the passive type volume pipe 53 flows into the 36L standard metal measuring device through the fifth switch and the third reverser, when the passive type volume pipe 53 stops working, the fifth switch is closed, the volume of the passive type volume pipe 53 is checked according to the volume of the water in the 36L standard metal measuring device, and after the check is finished, the sixth switch is opened to enable the water in the 36L standard metal measuring device to flow back to the water storage tank 61. In order to make the structure more compact, the second commutator and the third commutator are set as the same commutator, and the third switch and the fifth switch are set as the same switch.
The cleaning system 70 comprises a cleaning assembly 71, a first valve assembly 72, a second valve assembly 73, a second power unit 74, and a second circulating pump which can be used as the second power unit 74 and has a power of 1kw and a head of 30m, and the cleaning system comprises a cleaning assembly 74The assembly 71 is used for storing a liquid for cleaning the field calibration assembly 50, and a water-based metal cleaning agent can be used as a cleaning liquid, the first valve assembly 72 and the second valve assembly 73 are used for opening or closing the cleaning assembly 71, the first valve assembly 72 and the second valve assembly 73 are respectively arranged at two ends of the cleaning assembly 71, when the field calibration system is in a cleaning state, the cleaning assembly 71 is connected with the electric switch valve 55 through the first valve assembly 72 and is connected with the electric regulating valve 56 through the second valve assembly 73, the second circulating pump is arranged between the first valve assembly 72 and the electric switch valve 55, and the second circulating pump is used for conveying the liquid in the cleaning assembly 71 into the passive volume pipe 53 of the numerical control system 57. Wherein the cleaning component 71 comprises a cleaning agent box with a volume of 1m3The first valve assembly 72 comprises a first valve, the second valve assembly 73 comprises a second valve, the first valve, the cleaning agent box and the second valve are sequentially connected in series, the cleaning agent box is used for storing cleaning agents, and the first valve and the second valve are used for controlling the cleaning agent box to open and close. Furthermore, the cleaning assembly 71 further comprises a water tank having a volume of 1m3The first valve assembly 72 further comprises a third valve, the second valve assembly 73 further comprises a fourth valve, the third valve, the water tank and the fourth valve are sequentially arranged in series, the water tank and the cleaning agent tank are arranged in parallel, the water tank is used for storing cleaning water, and the third valve and the fourth valve are used for controlling the water tank to be opened and closed. Furthermore, the cleaning assembly 71 comprises a medium tank having a volume of 1m3The first valve assembly 72 further comprises a fifth valve, the second valve assembly 73 further comprises a sixth valve, the fifth valve, the medium box and the sixth valve are sequentially arranged in series, the medium box is respectively arranged in parallel with the water tank and the cleaning agent box, the medium box is used for storing the replaced fuel medium, and the fifth valve and the sixth valve are used for controlling the opening and closing of the medium box. The control unit is used for controlling the opening and closing of the first valve assembly 72, the second circulation pump and the second valve assembly 73.
The cleaning method of the calibration system in situ using flow measurement of the present invention is described in detail below. Firstly, the electric switch valve 55 is disconnected from the air elimination filter, the electric switch valve 55 is connected with a circulating pump in the cleaning system 70, and the electric regulating valve 56 is connected with a second valve component 73 in the cleaning system 70; secondly, the control unit controls the opening of the first valve, the second valve and the second power unit 74; the third and the second power units 74 input the water-based metal cleaning agent in the cleaning agent tank into the electric switch valve 55, the mass flow meter 54, the passive volume pipe 53 and the electric regulating valve 56 in sequence to clean the electric switch valve 55, the mass flow meter 54, the passive volume pipe 53 and the electric regulating valve 56; fourthly, the control unit closes the first valve and the second valve and opens the third valve and the fourth valve; the fifth and the second power units 74 input the water in the water tank into the electric switch valve 55, the mass flow meter 54, the passive volume pipe 53 and the electric regulating valve 56 in sequence to clean the electric switch valve 55, the mass flow meter 54, the passive volume pipe 53 and the electric regulating valve 56 with water; sixthly, the control unit closes the third valve and the fourth valve and opens the fifth valve and the sixth valve; the seventh and the second power units 74 sequentially input the replaced fuel media in the media tank into the electric switch valve 55, the mass flow meter 54, the passive volume pipe 53 and the electric regulating valve 56 to clean the electric switch valve 55, the mass flow meter 54, the passive volume pipe 53 and the electric regulating valve 56; eighth, the control unit closes the fifth valve, the sixth valve, and the second power unit 74. When the fuel medium before replacement is a water-soluble substance such as alcohol, the second and third steps can be omitted.
In conclusion, compared with the prior art, the on-site calibration system provided by the invention has the advantages that the influence of environmental factors such as pressure, bubbles and vibration on the flow measurement of the test bed of the aerospace engine is effectively reduced or eliminated, the on-site calibration on the flow measurement system of the test bed of the aerospace engine is realized, and the flow measurement precision of the test bed of the aerospace engine is effectively improved. Moreover, through setting up the volume pipe and checking the subassembly, can realize regularly checking passive form volume pipe standard volume, solve the problem that passive form volume pipe measurement accuracy reduces under the influence of site environment, further improve the degree of accuracy of on-the-spot calibration system.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. An engine test bed flow measurement field calibration system, characterized in that engine test bed flow measurement field calibration system includes:
a fuel supply unit (10), the fuel supply unit (10) being configured to provide fuel to an engine test bed flow measurement field calibration system;
a turbine flow meter assembly (20), the turbine flow meter assembly (20) being in line connection with the fuel supply unit (10), the turbine flow meter assembly (20) being for measuring flow within a line;
the system comprises an engine test bed (30) and a measurement and control unit (40), wherein the engine test bed (30) is connected with the measurement and control unit (40), and the measurement and control unit (40) is used for collecting flow data of the engine test bed (30) and the turbine flowmeter assembly (20);
the on-site calibration assembly (50) comprises a pressure reduction unit (51), a degassing unit (52) and a passive volume pipe (53) which are connected in sequence, wherein the pressure reduction unit (51) is used for reducing the pressure of fuel in a pipeline, the degassing unit (52) is used for removing gas in the fuel in the pipeline, and the passive volume pipe (53) is used for collecting the volume of flow in the pipeline for calibrating the turbine flow meter assembly (20);
a volume tube checking assembly (60), wherein the volume tube checking assembly (60) is used for checking the effective volume of the passive volume tube (53), and when the passive volume tube (53) is checked for volume, the volume tube checking assembly (60) is connected with two ends of the passive volume tube (53);
wherein the turbine flowmeter assembly (20) is selectively connectable to the decompression unit (51) in the engine test stand (30) or the field calibration assembly (50), the turbine flowmeter assembly (20) being connected to the engine test stand (30) when the field calibration system is in a normal test run mode of operation; when the on-site calibration system is in a first measurement state, the turbine flowmeter assembly (20) is connected with the decompression unit (51) in the on-site calibration assembly (50), the on-site calibration assembly (50) is used for calibrating the turbine flowmeter assembly (20), the on-site calibration system further has a second measurement state, and when the on-site calibration system is in the second measurement state, the on-site calibration assembly (50) is connected with the measurement and control unit (40) so as to calibrate the measurement and control unit (40).
2. The engine test bed flow measurement field calibration system of claim 1, wherein the volumetric tube audit assembly (60) comprises:
a water tank (61), said water tank (61) being adapted to supply and to recover water for checking said passive volumetric tube (53);
a first power unit (62), wherein the first power unit (62) is respectively connected with the water storage tank (61) and the passive volume pipe (53), and the first power unit (62) is used for inputting the water in the water storage tank (61) into the passive volume pipe (53);
a measuring assembly (63), the measuring assembly (63) being connected to the passive volume pipe (53) and the water storage tank (61), respectively, the measuring assembly (63) being configured to measure the volume of the passive volume pipe (53).
3. The engine test bed flow measurement field calibration system according to claim 2, characterized in that the measurement assembly (63) comprises:
a first switch (631), the first switch (631) being connected with the passive volume tube (53);
a diverter (632), the diverter (632) being connected to the first switch (631), the first switch (631) being configured to control whether communication between the passive volume tube (53) and the diverter (632) is established;
a primary standard (633), the primary standard (633) being coupled to the diverter (632), the primary standard (633) being configured to provide a standard volume, the volumetric tube check assembly (60) checking the effective volume of the passive volumetric tube (53) according to the standard volume provided by the primary standard (633);
a second switch (634), the second switch (634) being disposed between the primary standard (633) and the water storage tank (61), the second switch (634) being used to control whether communication between the primary standard (633) and the water storage tank (61) is established.
4. The engine test bed flow measurement in-situ calibration system of claim 2, wherein the volumetric tube check assembly (60) includes a plurality of the measurement assemblies (63), the measurement assemblies (63) having different measurement volumes, and the passive volumetric tube (53) is selectively connectable to any one of the measurement assemblies (63).
5. The engine test bed flow measurement in-situ calibration system of claim 3, further comprising a purge system (70), the purge system (70) being configured to purge the in-situ calibration assembly (50) when changing fuel media in the pipeline, the purge system (70) being configured to connect to both ends of the passive volume tube (53) in the in-situ calibration assembly (50) when the in-situ calibration system is in a purge state.
6. The engine test bed flow measurement in-situ calibration system of claim 5, wherein the purging system (70) comprises:
a cleaning assembly (71), the cleaning assembly (71) being configured to store a liquid for cleaning the field calibration assembly (50);
a first valve component (72) and a second valve component (73), wherein the first valve component (72) and the second valve component (73) are used for opening or closing the cleaning assembly (71), the first valve component (72) and the second valve component (73) are respectively connected with two ends of the cleaning assembly (71), and when the field calibration system is in a cleaning state, the second valve component (73) is connected with the passive volume pipe (53) in the field calibration assembly (50);
a second power unit (74), the second power unit (74) for delivering the liquid in the wash assembly (71) into the passive volume tube (53), the second power unit (74) being connected to the first valve assembly (72), the second power unit (74) being connected to the passive volume tube (53) in the field calibration assembly (50) when the field calibration system is in a wash state.
7. The engine test bed flow measurement in-situ calibration system of claim 6, wherein the in-situ calibration assembly (50) further comprises:
a mass flow meter (54) and an electrically operated on-off valve (55), the mass flow meter (54) for measuring the mass flow of fuel in the line of the field calibration assembly (50), the electric switch valve (55) is used for controlling the opening and closing of the fuel in the pipeline of the field calibration assembly (50), the mass flow meter (54) is respectively connected with the electric switch valve (55) and the passive volume pipe (53), when the on-site calibration system is in a first measurement state, the electric switching valve (55) is connected with the degassing unit (52), the electrically operated on-off valve (55) is connected to the first power unit (62) in the volumetric tube check assembly (60) when the field calibration system is in a volumetric tube check state, the electrically operated on-off valve (55) is connected to the second power unit (74) in the cleaning system (70) when the field calibration system is in a cleaning state;
an electric control valve (56), the electric control valve (56) is used for controlling the flow of fuel in the pipeline, the electric control valve (56) is connected with the passive volume pipe (53), when the field calibration system is in a first measurement state, the electric control valve (56) is connected with the fuel supply unit (10), when the field calibration system is in a volume pipe checking state, the electric control valve (56) is connected with a first switch (631) in the volume pipe checking assembly (60), and when the field calibration system is in a cleaning state, the electric control valve (56) is connected with the cleaning system (70).
8. The engine test bed flow measurement in-situ calibration system of claim 7, wherein the in-situ calibration assembly (50) further comprises a numerical control system (57), the numerical control system (57) being connected to the passive volume tube (53) and the turbine flow meter assembly (20) respectively to acquire the passive volume tube (53) and the turbine flow meter assembly (20) data, the in-situ calibration assembly (50) calibrating the turbine flow meter assembly (20) according to the acquired data.
9. The engine test bed flow measurement field calibration system according to claim 8, characterized in that the numerical control system (57) further comprises a signal transmission unit, the signal transmission unit is connected with the measurement and control unit (40), and when the field calibration system is in a second measurement state, the signal transmission unit transmits a measurement signal to the measurement and control unit (40) for calibrating the measurement and control unit (40).
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