CN111751112B - Test system and test method for air inlet test of fuel pump of aircraft engine - Google Patents
Test system and test method for air inlet test of fuel pump of aircraft engine Download PDFInfo
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- CN111751112B CN111751112B CN202010526095.6A CN202010526095A CN111751112B CN 111751112 B CN111751112 B CN 111751112B CN 202010526095 A CN202010526095 A CN 202010526095A CN 111751112 B CN111751112 B CN 111751112B
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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
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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
- G01M15/02—Details or accessories of testing apparatus
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Abstract
The invention belongs to the technical field of aero-engine tests, and particularly relates to a test system and a test method for an air inlet test of an aero-engine fuel pump; the device comprises a two-position two-way reversing valve a (1), a switch valve (2), a bubble volume metering device (3), a two-position two-way reversing valve b (4), a one-way valve (5), a two-position two-way reversing valve c (6), a two-position two-way reversing valve d (7), a visual transparent pipe section (8), a gas-liquid mixing device (9) and a gas-liquid ratio measuring instrument (10); the test system realizes the simulation of air inlet working conditions by a gas injection mode, controls the gas injection amount by adjusting the reversing frequency of the electromagnetic valve, and realizes the accurate measurement and control of gas-liquid ratio by a gas-liquid mixing device and a gas-liquid ratio measuring instrument; the test system has the advantages of small occupied space, high integration level and strong universality, and can be quickly combined with a fuel pump performance test bed to complete an air inlet test.
Description
Technical Field
The invention belongs to the technical field of aero-engine tests, and particularly relates to a test system and a test method for an aero-engine fuel pump air inlet test.
Background
The air inlet test needs to be carried out to simulate the corresponding working condition of an engine or to find out the flight envelope of the engine in the development process of the fuel pump of the aero-engine, and the air inlet test of the fuel pump comprises a continuous air inlet test and a fixed volume air inlet test. The air inlet test device needs to generate a certain proportion of oil-gas mixture to realize the working condition simulation. At present, no uniform air inlet test equipment exists in the industry.
The test device designs a gas inlet test system and a gas inlet test method, a required gas-liquid mixture is generated in a gas injection mode, the gas is uniformly distributed through a gas-liquid mixing device, the gas-liquid ratio of the gas-liquid mixture is measured through a gas-liquid ratio measuring instrument, and the gas-liquid ratio is accurately controlled through closed-loop control.
Disclosure of Invention
The technical problem solved by the invention is as follows: the air inlet test system and method for the fuel pump of the aircraft engine are provided, and high-precision control and measurement of a gas-liquid ratio are achieved.
The technical scheme of the invention is as follows: the test system for the air inlet test of the fuel pump of the aircraft engine comprises a two-position two-way reversing valve a, a switch valve, a bubble volume metering device, a two-position two-way reversing valve b, a one-way valve, a two-position two-way reversing valve c, a two-position two-way reversing valve d, a visual transparent pipe section, a gas-liquid mixing device and a gas-liquid ratio measuring instrument; the two-position two-way reversing valve a, the two-position two-way reversing valve d, the visual transparent pipe section, the gas-liquid mixing device and the gas-liquid ratio measuring instrument are sequentially connected to form a main pipeline; the two-position two-way reversing valve a, the bubble volume metering device, the two-position two-way reversing valve b, the two-position two-way reversing valve c and the two-position two-way reversing valve d are sequentially connected to form an air charging pipeline; one end of the one-way valve is connected with a constant-pressure constant-flow air source, and the other end of the one-way valve is connected with the two-position two-way reversing valve b and the two-position two-way reversing valve c; one end of the switch valve is connected with the two-position two-way reversing valve a and the bubble volume metering device, and the other end of the switch valve is communicated with the atmosphere.
The main pipeline consisting of the two-position two-way reversing valve a, the two-position two-way reversing valve d, the visual transparent pipe section, the gas-liquid mixing device and the gas-liquid ratio measuring instrument is obliquely arranged, and the included angle between the main pipeline and the horizontal plane is 0-90 degrees; the bubble volume metering device is vertically arranged.
The bubble volume metering device is a visual graduated volume metering device for metering the volume of gas injected.
The visual transparent pipe section is a transparent pipeline and is used for observing the gas-liquid mixing condition.
The gas-liquid mixing device is composed of multiple stages of splitter plates, uniform holes or blades are distributed on each stage of splitter plate, the number of the split parts is increased step by step, and the stage number and the design size of the splitter plates are determined according to the flow of a tested pump and the drift diameter of a pipeline of the testing device.
A test method of a test system for an air inlet test of an aircraft engine fuel pump,
during the air inlet test of single fixed gas capacity, two-position two-way reversing valve b gets electric, make the constant pressure air supply access system, realize oil extraction, the gas injection through the break-make of control switch valve, volume of gas injected is measured through bubble volume metering device, after the gas volume reaches the requirement, two-position two-way reversing valve b cuts off the power supply, two-position two-way reversing valve an and two-position two-way reversing valve d get electric simultaneously, gas-liquid mixture gets into the main line, get into the product under test through gas-liquid mixing device and gas-liquid ratio measuring apparatu, when need develop single fixed volume bubble air inlet test, detachable gas-liquid mixing device and gas-liquid ratio measuring apparatu.
A test method of a test system for an air inlet test of an aircraft engine fuel pump,
during a continuous air inlet test with fixed gas-liquid ratio, the two-position two-way reversing valve and the two-position two-way reversing valve are powered on, the high-frequency reversing of the two-position two-way reversing valve is used for realizing the quick connection of an air source into a system, and a gas-liquid mixture is fully mixed by a gas-liquid mixing device and enters a tested product after being measured by a gas-liquid ratio measuring instrument.
Control signal, t, of the two-position, two-way reversing valve1For a single valve energisation time, t2For a single power-off time, t1Determined by the response frequency of the two-position two-way reversing valve, the system pipe diameter and the flow of the tested product, t1The smaller the bubble volume. t is t1And t2The value range is obtained by calculating the response frequency, the system pipe diameter, the flow of the tested product and the gas-liquid ratio of the two-position two-way reversing valve, and t1The value of (a) should be as small as possible.
The gas-liquid ratio is set to be Li，k1And k is2Is the gas-liquid ratio coefficient of proportionality, and k is the default condition1＝0，k2＝1，t1Keeping the minimum value constant, and regulating t by a second PID controller2Realizing gas-liquid ratio closed-loop control; when t is2K is the minimum value of (a), when the deviation DeltaL is still larger than a certain set value1＝1，k2＝0，t2Keeping the minimum value unchanged, and regulating t by a first PID controller1Realize the gas-liquid ratio closed-loop control.
The innovation points of the invention are as follows: an air inlet test system is designed, and air inlet working condition simulation is realized through a gas injection mode.
The invention has the beneficial effects that: the designed test system can accurately control the gas-liquid ratio in the air inlet test of the engine fuel pump, and provides a test method for the investigation of the cavitation resistance of the fuel pump and the flight envelope test of the engine. The test system can realize negative pressure cavitation test, positive pressure air intake test, single air intake test with fixed air capacity, and continuous air intake test with fixed air-liquid ratio.
Drawings
FIG. 1 is a layout of the test system.
Wherein, 1 is a two-position two-way reversing valve a, 2 is a switch valve, 3 is a bubble volume metering device, 4 is a two-position two-way reversing valve b, 5 is a one-way valve, 6 is a two-position two-way reversing valve c, 7 is a two-position two-way reversing valve d, 8 is a visual transparent pipe section, 9 is a gas-liquid mixing device, and 10 is a gas-liquid ratio measuring instrument.
Fig. 2 is a hydraulic schematic diagram of the test system.
Fig. 3 is a view showing the structure of the gas-liquid mixing apparatus.
Fig. 4 shows the control signal for the two-position two-way selector valve 6.
FIG. 5 is a gas-to-liquid ratio closed loop control block diagram.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 and 2, the testing system of the invention comprises a two-position two-way reversing valve a1, a switch valve 2, a bubble volume metering device 3, a two-position two-way reversing valve b4, a check valve 5, a two-position two-way reversing valve c6, a two-position two-way reversing valve d7, a visual transparent pipe section 8, a gas-liquid mixing device 9 and a gas-liquid ratio measuring instrument 10; the main pipeline consisting of the two-position two-way reversing valve a1, the two-position two-way reversing valve d7, the visual transparent pipe section 8, the gas-liquid mixing device 9 and the gas-liquid ratio measuring instrument 10 is obliquely arranged, and the included angle between the main pipeline and the horizontal plane is 0-90 degrees; the bubble volume metering device 3 is vertically arranged, and a two-position two-way reversing valve a1, a two-position two-way reversing valve d7, a visual transparent pipe section 8, a gas-liquid mixing device 9 and a gas-liquid ratio measuring instrument 10 are sequentially connected to form a main pipeline; the two-position two-way reversing valve a1, the bubble volume metering device 3, the two-position two-way reversing valve b4, the two-position two-way reversing valve c6 and the two-position two-way reversing valve d7 are sequentially connected to form an air charging pipeline; one end of the check valve 5 is connected with a constant-pressure constant-flow air source, and the other end of the check valve is connected with a two-position two-way reversing valve b4 and a two-position two-way reversing valve c 6; one end of the switch valve 2 is connected with the two-position two-way reversing valve a1 and the bubble volume metering device 3, and the other end is communicated with the atmosphere.
The bubble volume metering device 3 is a visual graduated volume metering device for metering the volume of gas injected; the visual transparent pipe section 8 is a transparent pipeline and is used for observing the gas-liquid mixing condition; the structure diagram of the gas-liquid mixing device 9 is shown in fig. 3, and the gas-liquid mixing device is composed of a plurality of stages of splitter plates and is used for dividing bubbles and fully mixing the bubbles with oil liquid; the splitter vane is used for uniformly dividing bubbles, uniform holes or blades are distributed on each splitter vane stage, the number of dividing parts is increased step by step, and the stage number and the design size of the splitter vane are determined according to the flow of a tested pump and the pipeline drift diameter of a testing device.
The two-position two- way reversing valves 1, 4, 6 and 7 can be replaced by a plurality of switching valves for realizing reversing functions or other reversing valves with similar functions.
A test method of a test system for an air inlet test of an aircraft engine fuel pump,
during a single air inlet test with fixed air volume, the two-position two-way reversing valve b4 is powered on, a constant pressure air source is connected into the system, oil and air discharge and injection are realized by controlling the on-off of the switch valve 2, the volume of injected air is measured by the air bubble volume measuring device 3, the two-position two-way reversing valve b4 is powered off after the air volume meets the requirement, the two-position two-way reversing valve a1 and the two-position two-way reversing valve d7 are powered on simultaneously, an air-liquid mixture enters a main pipeline and enters a tested product through the air-liquid mixing device 9 and the air-liquid ratio measuring instrument 10, and when the single fixed volume air bubble air inlet test needs to be carried out, the air-liquid mixing device 9 and the air-liquid ratio measuring instrument 10 can be disassembled.
During a continuous air inlet test with a fixed gas-liquid ratio, the two-position two-way reversing valve 1 and the two-position two-way reversing valve 7 are powered on, a gas source is quickly connected into a system through high-frequency reversing of the two-position two-way reversing valve 6, and a gas-liquid mixture is fully mixed by the gas-liquid mixing device 9 and enters a tested product after being metered by the gas-liquid ratio measuring instrument 10.
The control signal of the two-position two-way directional valve 6 is shown in FIG. 4, t1For a single valve energisation time, t2For a single power-off time, t1Determined by the response frequency of the two-position two-way reversing valve 6, the pipe diameter of the system and the flow of the tested product, t1The smaller the bubble volume. t is t1And t2The value range is obtained by calculating the response frequency, the system pipe diameter, the flow of the tested product and the gas-liquid ratio of the two-position two-way reversing valve 6, and t1The value of (a) should be as small as possible.
The gas-liquid ratio control principle block diagram is shown in FIG. 4, and the set value of the gas-liquid ratio is Li，k1And k is2Is the gas-liquid ratio coefficient of proportionality, and k is the default condition1＝0，k2＝1，t1T is adjusted by the second PID controller 12 while maintaining the minimum value2Realizing gas-liquid ratio closed-loop control; when t is2K is the minimum value of (a), when the deviation DeltaL is still larger than a certain set value1＝1，k2＝0，t2T is adjusted by the first PID controller 11, maintaining the minimum value constant1Realize the gas-liquid ratio closed-loop control.
Claims (6)
1. The test system for the air intake test of the fuel pump of the aircraft engine is characterized by comprising a two-position two-way reversing valve a (1), a switch valve (2), a bubble volume metering device (3), a two-position two-way reversing valve b (4), a one-way valve (5), a two-position two-way reversing valve c (6), a two-position two-way reversing valve d (7), a visual transparent pipe section (8), a gas-liquid mixing device (9) and a gas-liquid ratio measuring instrument (10); a two-position two-way reversing valve a (1), a two-position two-way reversing valve d (7), a visual transparent pipe section (8), a gas-liquid mixing device (9) and a gas-liquid ratio measuring instrument (10) are sequentially connected to form a main pipeline; the two-position two-way reversing valve a (1), the bubble volume metering device (3), the two-position two-way reversing valve b (4), the two-position two-way reversing valve c (6) and the two-position two-way reversing valve d (7) are sequentially connected to form an air charging pipeline; check valve (5)One end of the valve is connected with a constant pressure and constant flow air source, and the other end of the valve is connected with a two-position two-way reversing valve b (4) and a two-position two-way reversing valve c (6); one end of the switch valve (2) is connected with the two-position two-way reversing valve a (1) and the bubble volume metering device (3), and the other end is communicated with the atmosphere; the gas-liquid mixing device (9) consists of a plurality of stages of splitter plates, uniform holes or blades are distributed on each stage of splitter plate, the number of the split parts is increased step by step, and the stage number and the design size of the splitter plates are determined according to the flow of a tested pump and the drift diameter of a pipeline of a testing device; a control signal of the two-position two-way reversing valve c (6),t 1the single-time electrifying time of the two-position two-way reversing valve c (6),t 2is the single power-off time of the two-position two-way reversing valve c (6),t 1determined by the response frequency of the two-position two-way reversing valve c (6), the pipe diameter of the system and the flow rate of the tested product,t 1the smaller the bubble volume;t 1andt 2the value range is obtained by calculating the response frequency of the two-position two-way reversing valve c (6), the pipe diameter of the system, the flow rate of the tested product and the gas-liquid ratio,t 1the value of (A) should be as small as possible; the gas-liquid ratio is a set valueL i，k 1Andk 2is a gas-liquid ratio coefficient, under the default condition,k 1=0，k 2=1，t 1maintaining the minimum value constant, and adjusting by a second PID controller (12)t 2Realizing gas-liquid ratio closed-loop control; when in uset 2Is taken as the minimum value, deviation DeltaL is stillWhen the temperature is higher than a certain set value,k 1=1，k 2=0，t 2maintaining the minimum value constant, and adjusting by a first PID controller (11)t 1Realize the gas-liquid ratio closed-loop control.
2. The test system for the air inlet test of the fuel pump of the aircraft engine according to claim 1, wherein a main pipeline consisting of the two-position two-way reversing valve a (1), the two-position two-way reversing valve d (7), the visual transparent pipe section (8), the gas-liquid mixing device (9) and the gas-liquid ratio measuring instrument (10) is obliquely arranged, and the included angle between the main pipeline and the horizontal plane is 0-90 degrees; the bubble volume metering device (3) is vertically arranged.
3. The test system for air intake tests of fuel pumps of aircraft engines according to claim 1, characterized in that the bubble volume metering device (3) is a visual graduated volume metering device for metering the volume of injected gas.
4. The test system for the air intake test of an aircraft engine fuel pump according to claim 1, characterized in that the visually transparent tube section (8) is a transparent tube for observing the mixture of gas and liquid.
5. The testing method of the testing system for the air intake test of the fuel pump of the aircraft engine according to any one of claims 1 to 4,
during the air inlet test of single fixed gas capacity, two-position two-way reversing valve b (4) gets electric, make the constant pressure air supply access system, realize oil extraction, the gas injection through the break-make of control switch valve (2), measure the volume of the gas of injection through bubble volume metering device (3), after the gas volume reaches the requirement, two-position two-way reversing valve b (4) outage, two-position two-way reversing valve a (1) and two-position two-way reversing valve d (7) are electrified simultaneously, the gas-liquid mixture gets into the main pipeline, get into the product under test through gas-liquid mixing device (9) and gas-liquid ratio measuring apparatu (10), when need carrying out single fixed volume bubble air inlet test, detachable gas-liquid mixing device (9) and gas-liquid ratio measuring apparatu (10).
6. The testing method of the testing system for an air intake test of an aircraft engine fuel pump of claim 5,
during a continuous air inlet test with a fixed gas-liquid ratio, the two-position two-way reversing valve a (1) and the two-position two-way reversing valve d (7) are powered on, a gas source is quickly connected into the system by high-frequency reversing of the two-position two-way reversing valve c (6), and a gas-liquid mixture is fully mixed by a gas-liquid mixing device (9) and metered by a gas-liquid ratio measuring instrument (10) and then enters a tested product.
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| CN202010526095.6A CN111751112B (en) | 2020-06-10 | 2020-06-10 | Test system and test method for air inlet test of fuel pump of aircraft engine |
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| CN202010526095.6A CN111751112B (en) | 2020-06-10 | 2020-06-10 | Test system and test method for air inlet test of fuel pump of aircraft engine |
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| CN111751112B true CN111751112B (en) | 2022-05-13 |
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