CN112964474B - Low-pressure fuel flow measurement system and method for aviation - Google Patents
Low-pressure fuel flow measurement system and method for aviation Download PDFInfo
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- CN112964474B CN112964474B CN202110173473.1A CN202110173473A CN112964474B CN 112964474 B CN112964474 B CN 112964474B CN 202110173473 A CN202110173473 A CN 202110173473A CN 112964474 B CN112964474 B CN 112964474B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
Abstract
The application belongs to the aviation fuel technology, and particularly relates to a low-pressure fuel flow measurement system and method for aviation. The low-pressure fuel flow measurement system for aviation comprises a fuel supply system, a pressure regulating system, a flow measurement system and an oil return system which are sequentially communicated. The fuel oil tank is arranged on the adjustable support, the adjustable support is provided with a vertical support frame, mounting platforms with different heights for mounting the fuel oil tank are arranged on the adjustable support, and the lowest position of the mounting platform is at least 0.2m away from the pressure regulating system. The low-pressure fuel flow measuring system for aviation can realize low-pressure fuel flow measurement of 1-25 kPa, has the advantages of simple structure, small volume, convenient disassembly and installation, convenient movement, low cost and easy implementation, and can measure the low-pressure fuel flow in different occasions.
Description
Technical Field
The application belongs to the aviation fuel technology, and particularly relates to a low-pressure fuel flow measurement system and method for aviation.
Background
In the prior art, the fuel flow measuring method in the aviation field is generally consistent with the fuel manifold or nozzle flow measuring method, and the pump is used for supplying oil, the oil supply pressure is about 3MPa, and the stable inlet oil pressure after the pressure regulating valve is about 50 kPa. At present, no universal and mature method and system for measuring the low-pressure fuel flow below 25kPa exist in China.
The head of the flame tube of the aero-engine selects an atomization device with a special structure, the flow property is verified by carrying out a fuel flow test under low pressure difference, the pressure difference between an inlet and an outlet is 10-20 kPa, and the fuel pump and the pressure regulating valve of the existing fuel flow tester can not meet the test requirement.
Disclosure of Invention
The purpose of the application is that: a system and method are provided that enable satisfactory low pressure fuel flow measurement.
The technical scheme of the application is as follows: the utility model provides an aviation is with low pressure fuel flow measurement system, its oil feeding system, pressure regulating system, flow measurement system and oil return system that communicates in order, wherein, oil feeding system includes the fuel tank of band-pass gas, adjustable support and stop valve, the fuel tank sets up on adjustable support, adjustable support has vertical support frame, and is provided with the mounting platform that is used for the fuel tank installation of different heights above, and this mounting platform minimum and pressure regulating system have 0.2 m's difference in height at least.
The adjustable bracket is provided with a height coordinate in the vertical direction so as to be capable of conveniently obtaining a height adjustment value of the fuel tank.
The flow measurement system comprises a low-pressure oil inlet sealing joint, a product to be measured, a low-pressure oil outlet sealing joint, a measuring cylinder, an electronic scale and a timer, wherein the oil inlet sealing joint and the oil outlet sealing joint adopt cylindrical copper joints due to small oil supply pressure, the inner wall surfaces of the two ends are screw threads, the outer wall surfaces are provided with rubber ring grooves, and the oil inlet sealing joint and the oil outlet sealing joint can be matched with a clamp for use, so that the oil inlet sealing joint and the oil outlet sealing joint are convenient to connect with the products to be measured of various interfaces.
The whole low-pressure fuel flow measurement system for aviation is detachable, the adjustable support is detachable into a fixing frame and an adjusting frame, the system with the fixing frame is small in size and light in weight, can be stored in a 30-inch suitcase, is portable to move, is simple to install, and can be used in various flow measurement environments.
The fixing frame is circumferentially positioned with the arc plate at the bottom of the fuel oil tank, the two sides are positioned by applying pretightening force with the flat plate through bolts, and when the fuel oil is injected into the fuel oil tank, the greater the surface pressure of the fuel oil tank and the fixing frame is, the greater the friction force is, the good stability is achieved, and the reliability is high.
The fuel oil tank is a sealed cylindrical fuel tank made of light alloy, fuel oil leakage is prevented, fuel oil capacity is judged through a liquid level observation window, the balanced pressure of the vent with the filter screen at the top ensures the oil outlet, meanwhile, the fuel oil is prevented from being polluted by redundant substances, and the fuel oil cleanliness requirement is ensured.
The flow measurement system adopts a small-range high-precision pressure gauge, adopts a pipeline with a smooth inner wall surface, the length of the pressure gauge from the pipeline of the part to be measured is 50-200 mm, and the pressure measurement is closer to the actual value
According to the measuring method based on the aviation low-pressure fuel flow measuring system, the position of the fuel tank on the adjustable bracket is adjusted, so that fuel in the fuel tank has different gravitational potential energy relative to the pressure regulating system, pressure difference is generated, and stable low-pressure output of 1-25 kPa can be generated after the pressure is regulated by the pressure regulating system, so that the flow measuring system can measure low-pressure flow.
The relation formula of the height and the oil pressure between the hydraulic oil tank and the pressure regulating system is as follows:
Δp=7644× Δh, where Δp is the required oil supply pressure in Pa and Δh is the difference in height between the hydraulic tank outlet and the pressure regulating system in m.
The beneficial effects of the application are as follows: the low-pressure fuel flow measuring system for aviation can realize low-pressure fuel flow measurement of 1-25 kPa, has the advantages of simple structure, small volume, convenient disassembly and installation, convenient movement, low cost and easy implementation, and can be used for low-pressure fuel flow measurement in different occasions.
Drawings
Figure 1 is a schematic diagram of the low-pressure fuel flow measuring system for aviation of the application,
wherein, 1-an oil supply system, 11-a fuel oil tank with a vent, 12-an adjustable bracket and 13-a stop valve; 2-pressure regulating system, 21-pressure regulating valve, 22-pressure gauge; 3-a measurement system; 4-oil return system, 41-oil filter and 42-oil return tank.
Figure 2 is a schematic view of the structure of the adjustable bracket,
the device comprises 11 parts of a fuel oil tank with a vent, 121 parts of a fixing frame, 122 parts of a height gauge, 123 parts of an adjusting frame and 13 parts of a stop valve.
Fig. 3 is a schematic diagram of a flow measurement system, wherein 31-measuring pipeline, 32-low pressure oil inlet sealing joint, 33-product to be measured, 34-low pressure oil outlet sealing joint, 35-measuring cylinder, 36-electronic scale, 37-timer.
Detailed Description
The present application will be described in further detail with reference to the drawings and the embodiments, in order to make the objects, technical solutions and advantages of the present application more apparent.
Referring to fig. 1, the low-pressure fuel flow measurement system for aviation of the present application includes an oil supply system, a pressure regulating system, a flow measurement system and an oil return system which are sequentially communicated. The fuel supply system comprises a fuel tank with a vent, an adjustable support and a stop valve, wherein the fuel tank is arranged on the adjustable support, the adjustable support is provided with a vertical support frame, an installation platform capable of moving up and down and used for installing the fuel tank is arranged on the adjustable support, and the lowest part of the installation platform is at least 0.2m high difference with the pressure regulating system.
Please refer to fig. 2, which is a schematic diagram of the adjustable bracket. The adjustable support is detachable to be a fixing frame and an adjusting frame, the fixing frame is arranged on the adjusting frame, the periphery of the fixing frame is of a frame structure, the bottom of the fixing frame is a bottom plate with a concave mounting surface and is used for mounting a fuel oil tank, the fixing frame and an arc plate at the bottom of the fuel oil tank are circumferentially positioned, the two sides of the fixing frame are positioned by applying pretightening force with a flat plate through bolts, after the fuel oil is injected into the fuel oil tank, the greater the surface pressure of the fixing frame is, the greater the friction force is, the stability is good, and the reliability is high. The system of this mount is small, and light in weight can accomodate to 30 cun travelling basket, removes portably, and the installation is simple, can be used to various flow measurement environment.
The vertical support frame of alignment jig is provided with the adjustment platform that can dismantle and be used for the mount installation, passes through the bolt fastening between this adjustment platform and the vertical support frame to the dismantlement installation of being convenient for.
The vertical support frame of the adjustable support is provided with a vertical height coordinate so as to conveniently obtain a height adjustment value of the fuel tank. The relation formula of the height and the oil pressure between the hydraulic oil tank and the pressure regulating system is as follows:
Δp=7644 Δh, where Δp is the required supply pressure in Pa and Δh is the height difference between the hydraulic tank outlet and the pressure regulating system in m.
Referring to fig. 3, the flow measurement system includes a low-pressure oil inlet sealing joint, a measurement pipe, a product to be measured, a low-pressure oil outlet sealing joint, a measuring cylinder, an electronic scale and a timer, wherein the low-pressure oil inlet sealing joint and the low-pressure oil outlet sealing joint are respectively connected to two ends of the product to be measured, and simultaneously the two ends of the low-pressure oil inlet sealing joint and the low-pressure oil outlet sealing joint are connected to the measurement pipe, the measuring cylinder is arranged on the measurement pipe connected with the low-pressure oil outlet sealing joint, the electronic scale is arranged under the measuring cylinder, and the electronic scale is connected with the timer. The low-pressure oil inlet and oil outlet sealing joint adopts a cylindrical copper joint, and is internally of a threaded structure and used for measuring sealing connection between a pipeline and a product to be measured. When the flow measurement system is used for measuring, a weight method is adopted, the weight of the fuel oil which flows through the product to be measured and reaches the measuring cylinder is measured by the electronic scale, the timer is used for timing, and the flow of the low-pressure unit time of the product to be measured is calculated.
The pressure regulating system comprises a pressure regulating valve and a small-range pressure gauge, and adopts a pipeline with a smooth inner wall surface for fine adjustment of oil supply pressure, wherein the length of the small-range pressure gauge from a pipeline to be measured is 50-200 mm, and the problem that the pipeline is overlong, increases flow resistance and influences measurement accuracy is avoided under the condition that the assembly requirement is met.
In addition, the oil return system comprises an oil filter and an oil return box and is used for system oil return.
When the method for measuring the flow rate of the low-pressure fuel for aviation is used, the position of the fuel tank on the adjustable bracket is adjusted, so that the fuel in the fuel tank has different gravitational potential energy relative to the pressure regulating system, pressure difference is generated, stable low-pressure output of 1-25 kPa can be generated after the pressure is regulated by the pressure regulating system, the low-pressure flow rate is measured by the flow measuring system, and the fuel flows to the oil return system for recovery after the measurement is completed.
In an embodiment, the adjustable bracket fixing frame in the aviation low-pressure fuel flow measuring system is a rectangular bracket for fixing a cylindrical fuel tank, and the bottom of the bracket fixing frame is 0.2m away from the bottom of the fuel tank, so that the minimum measuring height is ensured. The fixing frame and the oil drum can be stably placed on any plane. The adjusting frame is an adjustable bracket with vertical height coordinates, and the adjustable maximum height of a platform on which the fixing frame is placed is 2.5m. If the stable oil supply pressure is 1-15 kPa after the adjustment, an adjusting frame can be utilized, and the maximum oil supply pressure is 19kPa; if the required oil supply pressure is 15-25 kPa, the fixing frame can be independently placed on the platforms of the second floor and the third floor, so that the oil supply pressure can be met. Compared with the traditional integrated fuel measurement system, the system has the advantages of small volume, convenient movement and carrying, stable device, simple installation and good maintenance, and can be used for various environments.
In the embodiment, the fuel oil tank is cylindrical, the cylindrical surface is fixed by 4 concave arc-shaped thick grid plates at the bottom of the fixing frame, and the two ends of the cylinder are fixed by flat plates with bolts at the two ends, so that the connection stability of the fuel oil tank and the fixing frame is ensured. The wall surface of the fuel oil tank with the air inlet on the fuel oil tank is provided with an observation window, so that the position of the liquid level in the barrel can be observed, and the fuel oil can be conveniently added. The switchable oil inlet with a sealing structure is arranged above the fuel oil tank to prevent fuel oil leakage. The vent with a filter screen is arranged above the fuel oil tank, so that fuel oil can flow conveniently to balance oil pressure, and meanwhile, excessive materials are prevented from entering.
When in actual measurement, the elbow pipe component serving as a product to be measured is connected to a flow measurement system, the height is calculated according to the required pressure, the height difference between the liquid level of the fuel oil tank with the air inlet and the pressure gauge is adjusted to be 2.5 meters, the maximum pressure is 19kPa, the fuel supply pressure is finely adjusted to be 15kPa through a pressure regulating valve, the fuel flow of the elbow pipe combination is measured, and the flow measurement result is 400ml/min, namely the fuel is qualified.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application, and in addition, the unremoved portions of the present application are conventional techniques.
Claims (9)
1. The utility model provides an aviation low pressure fuel flow measurement system, its characterized in that includes oil feeding system, pressure regulating system, flow measurement system and the return oil system that communicates in order, wherein, oil feeding system includes the fuel tank of band-pass gas, adjustable support and stop valve, the fuel tank sets up on adjustable support, adjustable support has vertical support, and is provided with the mounting platform that is used for the fuel tank installation above, and this mounting platform minimum and pressure regulating system have 0.2 m's difference in height, flow measurement system includes low pressure oil feeding seal joint, measurement pipeline, the product of awaiting measuring, low pressure oil outlet seal joint, graduated flask, electronic scale, time-recorder, wherein, low pressure oil feeding seal joint, low pressure oil outlet seal joint are connected respectively at the product both ends of awaiting measuring, and simultaneously low pressure oil feeding seal joint, low pressure oil outlet seal joint both ends are connected on the measurement pipeline, are provided with the electronic scale connection time-recorder on the measurement pipeline that is connected with low pressure oil outlet seal joint, when flow measurement system measures, utilize the weight method to flow measurement system to flow through the product of awaiting measuring scale and the time-recorder of the product of awaiting measuring by low pressure time-recorder calculation.
2. The low-pressure fuel flow measurement system for aviation according to claim 1, wherein the adjustable bracket is provided with a vertical height coordinate so as to be capable of conveniently obtaining a fuel tank height adjustment value.
3. The aviation low-pressure fuel flow measurement system according to claim 2, wherein the adjustable bracket is detachably arranged as a fixing frame and an adjusting frame, the fixing frame is arranged on the adjusting frame, the periphery of the fixing frame is of a frame structure, the bottom of the fixing frame is a bottom plate with a concave mounting surface and is used for mounting a fuel tank, the fixing frame and a curved plate at the bottom of the fuel tank are circumferentially positioned, and the two sides of the fixing frame are positioned by applying pretightening force with a flat plate through bolts.
4. The low-pressure fuel flow measuring system for aviation according to claim 3, wherein the vertical support frame of the adjusting frame is provided with an adjusting platform which is detachably used for fixing the frame, and the adjusting platform is fixed with the vertical support frame through bolts.
5. The low-pressure fuel flow measuring system for aviation according to claim 1, wherein the low-pressure fuel inlet and outlet sealing joint adopts a cylindrical copper joint and is internally of a thread structure.
6. The aviation low-pressure fuel flow measuring system according to claim 1, wherein the pressure regulating system comprises a pressure regulating valve and a small-range pressure gauge, and adopts a pipeline with a smooth inner wall surface, and the length of the pipeline from the small-range pressure gauge to a product to be measured is 50-200 mm.
7. The aviation low-pressure fuel flow measuring system according to claim 1, wherein the hydraulic oil tank is a sealed cylindrical oil tank made of light alloy, fuel leakage is prevented, a liquid level observation window is arranged on the wall surface to judge the fuel capacity, and a vent balance pressure with a filter screen is arranged on the top to ensure the oil discharge.
8. A measurement method based on the aviation low-pressure fuel flow measurement system according to any one of claims 1 to 7, characterized in that the fuel tank position on the adjustable bracket is adjusted to enable the fuel in the fuel tank to have different gravitational potential energy relative to the pressure regulating system, so as to generate pressure difference, and after the pressure is regulated by the pressure regulating system, stable low-pressure output of 1 to 25kPa can be generated for the flow measurement system to perform low-pressure flow measurement.
9. The method for measuring the flow rate of low-pressure fuel for aviation according to claim 8, wherein the relation between the height of the hydraulic tank and the pressure regulating system and the oil pressure is expressed as follows:
Δp=7644× Δh, where Δp is the required oil supply pressure in Pa and Δh is the difference in height between the hydraulic tank outlet and the pressure regulating system in m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110173473.1A CN112964474B (en) | 2021-02-09 | 2021-02-09 | Low-pressure fuel flow measurement system and method for aviation |
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| CN202110173473.1A CN112964474B (en) | 2021-02-09 | 2021-02-09 | Low-pressure fuel flow measurement system and method for aviation |
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| CN112964474A CN112964474A (en) | 2021-06-15 |
| CN112964474B true CN112964474B (en) | 2023-10-13 |
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| CN112964474A (en) | 2021-06-15 |
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