Fuel pollution test method and device for fuel pump regulator of engine

Abstract

The invention discloses a fuel pollution test method and device for an engine fuel pump regulator. The method comprises the following steps that S1, the technical state of a test piece is obtained, a fuel pollution test device is obtained, and the fuel pollution test device is adjusted; s2, checking the fuel pollution test device, and cleaning the fuel pollution test device; s3, the working condition of the fuel pump regulator and the possible pollution condition of used fuel are obtained, and pollution components are determined; s4, acquiring fuel pollution test parameters; s5, setting a pollution amount calculation formula, and calculating a pollutant amount value; and S6, performing a fuel oil pollution test to obtain a fuel oil pollution test result, and judging whether the fuel oil pollution test is qualified or not. According to the invention, the fuel pollution test of the fuel pump regulator is realized, the working capability of the aero-engine fuel pump regulator after the aero-engine fuel pump regulator suffers from polluted fuel is assessed, the flight safety of the aero-engine under each typical mission profile of an aircraft is ensured, and the safety of the aero-engine is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of aerospace engine testing, and in particular relates to a fuel contamination testing method and device for an engine fuel pump regulator. Background Art

[0002] The engine fuel pump regulator is the core component of the engine fuel system, and fuel contamination is an important cause of engine fuel pump regulator failure. There are a large number of precision matching components inside the fuel pump regulator. If contaminated particles enter the relative sliding parts inside the fuel pump regulator, it will cause "stuck" phenomenon, resulting in the failure of these components. If there is free water in the fuel, it can not only oxidize with the test piece to cause corrosion, but also react with additives, oxygen, metals and other substances in the fuel to produce sticky colloid substances. These colloid substances will not only block the oil filter but also reduce the sliding performance of friction pairs such as valves, seriously reducing the service life of the pump regulator. When air dissolves in the fuel, it is very likely to cause cavitation, cavitation, air plug and other phenomena, which will reduce the life of the pump regulator at the least, and quickly cause serious wear and even failure of related parts in the pump regulator, making it unable to work normally. Contamination of the fuel pump regulator may directly affect the normal operation of the engine and even lead to accidents that affect flight safety. In recent years, the development of aircraft engines has paid more and more attention to safety. Therefore, in the development of the engine fuel system, in addition to taking certain measures in design to ensure that the fuel cleanliness is within the specified range, the engine fuel pump regulator's ability to withstand the fuel contamination limit should also be verified according to the relevant engine airworthiness requirements to ensure the safety of the engine. To this end, it is necessary to find a test method for the fuel contamination test of the aircraft engine fuel pump regulator to verify the ability of the engine fuel pump regulator to withstand the fuel contamination limit. At present, in the development of aircraft engines, no assessment test has been carried out on the fuel contamination limit of the aircraft engine fuel pump regulator, and there is no specific test method. Only clean fuel and protective measures are taken in design to ensure the cleanliness of the fuel used by the fuel pump regulator. For example, the industrial standard GJB241A3.7.3.3.2 only clarifies the composition of pollutants, but does not clarify the number of hours for conducting engine fuel system pollution tests; for example, the paper Research on Aircraft Engine Fuel System Pollution Test Scheme in the April 2013 issue of "Aviation Maintenance and Engineering" and the paper Engine Fuel System Oil Filter Pollution Test in the July 2022 issue of "Hydraulics, Pneumatics and Sealing" respectively proposed pollution test research on the fuel system or the fuel system oil filter, but did not propose a test method for the fuel pollution test of the fuel pump regulator. The current existing technology lacks a scientific fuel pollution test method for fuel pump regulators, and the fuel pollution test method for the fuel system and fuel system oil filter is not applicable to the fuel pump regulator.

[0003] Therefore, a fuel contamination test method for an aircraft engine fuel pump regulator is needed to quantify the amount of pollutants in the fuel pump regulator under different working conditions, so as to verify the tolerance of the fuel pump regulator to the fuel contamination limit under the most severe conditions under various mission profiles of the aircraft. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method and device for testing fuel contamination of an engine fuel pump regulator.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a fuel contamination test method for an engine fuel pump regulator, comprising the following steps:

[0007] S1. Obtain the technical status of the test piece, start the fuel contamination test device, and adjust the fuel contamination test device according to the technical status of the test piece;

[0008] S2. Calibrate and clean the fuel pollution test device;

[0009] S3, obtaining the working condition of the fuel pump regulator and the possible contamination of the used fuel, and determining the contamination components according to the working condition of the fuel pump regulator and the possible contamination of the used fuel;

[0010] S4. Obtaining fuel contamination test parameters, wherein the fuel contamination parameters include the maximum endurance time of the engine, the total amount of test fuel, the fuel flow rate in the take-off state, and the inlet pressure in the take-off state;

[0011] S5. Setting a pollution amount calculation formula, and calculating the pollutant amount value according to the fuel pollution parameter and the pollution amount calculation formula;

[0012] S6. Perform a fuel pollution test according to fuel pollution test parameters, pollutant amounts and pollutant components through a fuel pollution test device, obtain a fuel pollution test result, and determine whether the fuel pollution test is qualified according to the fuel pollution test result.

[0013] Preferably, the calibration fuel contamination test device comprises: a calibration instrument, a calibration equivalent nozzle and a calibration transmission seat.

[0014] Preferably, the obtaining of fuel contamination test parameters comprises the following steps:

[0015] Obtain the aircraft model, and determine the fuel tank size, engine typical mission cycle, and engine maximum flight time based on the aircraft model;

[0016] Determine the total amount of test fuel according to the size of the fuel tank;

[0017] Determine the takeoff fuel flow and takeoff inlet pressure based on the typical engine mission cycle.

[0018] The pollution amount calculation formula is as follows:

[0019]

[0020] Among them, M is the pollutant value, T is the maximum endurance of the engine, and F is the fuel flow rate at takeoff.

[0021] Preferably, the fuel pollution test is performed by the fuel pollution test device according to the fuel pollution test parameters, the pollutant amount and the pollutant composition, including the following steps:

[0022] Adding pollutants into the fuel pollution test device according to the pollutant amount and the pollutant composition, and installing the test piece into the fuel pollution test device;

[0023] Set the test hours according to the maximum endurance of the engine;

[0024] The inlet fuel flow rate and fuel pressure of the fuel pump regulator are set according to the fuel flow rate in the take-off state and the inlet pressure in the take-off state;

[0025] Conduct fuel contamination tests based on test hours, inlet fuel flow and fuel pressure;

[0026] When the fuel contamination test is performed, the fuel contamination test device continuously injects contaminants and fuel into the inlet pipeline of the fuel pump regulator.

[0027] Preferably, the fuel contamination test results include: fuel pump regulator performance parameters and precision parts clearance;

[0028] The judging whether the fuel contamination test is qualified according to the fuel contamination test result specifically refers to judging whether the performance parameters of the fuel pump regulator and the clearance of the precision parts meet the factory requirements of the fuel pump regulator.

[0029] Preferably, the fuel pump regulator performance parameters include: differential pressure valve, maximum speed port reduction value, minimum fuel supply change value, maximum fuel supply change value, speed sensitivity change value, cooperative working time deviation value of follow-up mechanism and fuel quantity deviation value of pressure distribution valve;

[0030] The precision parts clearance includes: the clearance value of the precision valve pair, the clearance value increase between the throttle start and the bushing, the clearance source between the hydraulic delay rod and the bushing, the radial clearance change value between the bearing pin and the bearing housing, and the wear amount of the swash plate bearing.

[0031] A fuel contamination test device for an engine fuel pump regulator, used to implement the above-mentioned fuel contamination test method, comprises: an oil injection module, a pollutant injection module, a control module and a blockage indication alarm; the oil injection module and the pollutant injection module are respectively connected to a test piece, the blockage indication alarm is connected to the test piece, and the control module is respectively connected to the oil injection module, the pollutant injection module, the test piece and the blockage indication alarm;

[0032] The oil injection module is used to inject fuel into the test piece;

[0033] The pollutant injection module is used to inject pollutants into the test piece;

[0034] The blockage indication alarm is used to indicate that the test piece is blocked and to start the test;

[0035] The control module is used to control the oil injection module, the pollutant injection module, the test piece and the fuel recovery module, receive the signal of the blockage indication alarm, and control the fuel contamination test.

[0036] Preferably, it also includes a fuel recovery module, which is connected to the test piece and the oil injection module respectively:

[0037] The fuel recovery module is used to recover the fuel used in the fuel contamination test and transport it to the oil injection module.

[0038] Preferably, the pollutant injection module comprises: a mud injection system and a salt water injection system; the mud injection system and the salt water injection system are respectively connected to the test piece;

[0039] The slurry injection system is used to inject slurry contaminants into the test piece;

[0040] The saline injection system is used to inject saline contaminants into a test piece.

[0041] The beneficial effects of the present invention are:

[0042] The fuel pump regulator fuel contamination test has been implemented to assess the working ability of the aircraft engine fuel pump regulator after being exposed to contaminated fuel, to ensure the flight safety of the aircraft engine under various typical mission profiles of the aircraft, and to ensure the safety of the aircraft engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flow chart of a method provided by an embodiment of the present invention;

[0044] Figure 2 It is a schematic diagram of the structure of a device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0046] like Figure 1 As shown, a fuel contamination test method for an engine fuel pump regulator includes the following steps:

[0047] S1. Obtain the technical status of the test piece, start the fuel contamination test device, and adjust the fuel contamination test device according to the technical status of the test piece;

[0048] In this embodiment, a fuel contamination test is conducted on the fuel pump regulator of the engine, and the test piece is the fuel pump regulator. The fuel pump regulator used for the test should meet the final technical status of the engine development, that is, the technical status of the test piece meets the final technical status of the engine development, so as to ensure the accuracy of the test. In order to avoid large economic losses, the fuel contamination test is not conducted on the whole engine. The fuel contamination test is carried out on a fuel contamination test device. The fuel contamination test device is adjusted according to the technical status of the test piece to ensure that the fuel contamination test device meets the technical status of the test piece, thereby ensuring the accuracy of the test.

[0049] S2. Calibrate and clean the fuel pollution test device;

[0050] Before conducting the fuel contamination test, in order to ensure the accuracy of the test data, the fuel contamination test device should be calibrated using fuel that meets the engine regulations. In this embodiment, the fuel contamination test device is calibrated using clean RP-2 fuel.

[0051] The calibration fuel pollution test device comprises: a calibration instrument, a calibration equivalent oil nozzle and a calibration transmission seat.

[0052] In order to ensure that the fuel contamination test device is not affected by other pollutants, the fuel contamination test device is cleaned before the test.

[0053] S3, obtaining the working condition of the fuel pump regulator and the possible contamination of the used fuel, and determining the contamination components according to the working condition of the fuel pump regulator and the possible contamination of the used fuel;

[0054] In this embodiment, the results of determining the pollution components are shown in the following table:

[0055]

[0056]

[0057] S4. Obtaining fuel contamination test parameters, wherein the fuel contamination parameters include the maximum endurance time of the engine, the total amount of test fuel, the fuel flow rate in the take-off state, and the inlet pressure in the take-off state;

[0058] The method of obtaining the fuel pollution test parameters comprises the following steps:

[0059] Obtain the aircraft model, and determine the fuel tank size, engine typical mission cycle, and engine maximum flight time based on the aircraft model;

[0060] Determine the total amount of test fuel according to the size of the fuel tank;

[0061] The total amount of test fuel is determined based on the size of the aircraft fuel tank where the engine is installed, so as to most realistically simulate the actual situation.

[0062] Determine the takeoff fuel flow and takeoff inlet pressure based on the typical engine mission cycle.

[0063] There are requirements for fuel flow when conducting fuel contamination test on fuel pump regulator. The fuel flow of fuel pump regulator is different when the engine is in different working states. The fuel contamination test method is to verify the ultimate ability of fuel pump regulator to resist fuel contamination. According to the mission cycle of typical flight mission profile provided by the aircraft, the fuel flow value under extreme conditions of typical mission cycle of the engine should be selected for testing. The test can generally be selected in the take-off state, when the engine is in the maximum or afterburner state, and the flow of fuel pump regulator is the largest. At this time, the value of fuel contaminants in the fuel pump regulator is the highest. Only by selecting the fuel flow corresponding to this state to conduct fuel contamination test on fuel pump regulator can the ultimate ability of fuel pump regulator to tolerate contaminated fuel be assessed.

[0064] In this embodiment, the maximum endurance time of the engine is obtained to be 10 hours, the total test fuel amount is 3 tons, the fuel flow rate in the take-off state is 8000 L / h, and the inlet pressure in the take-off state is 0.33 MPa.

[0065] S5. Setting a pollution amount calculation formula, and calculating the pollutant amount value according to the fuel pollution parameter and the pollution amount calculation formula;

[0066] The pollution amount calculation formula is as follows:

[0067]

[0068] Among them, M is the pollutant value, T is the maximum endurance of the engine, and F is the fuel flow rate at takeoff.

[0069] In the formula, 4.5g / 4500L is the pollution calculation coefficient, which is obtained by referring to European standards and model experience.

[0070] In this embodiment, the pollutant amount M is calculated to be 4.5 g / 4500 L×10(h)×8000(L / h)=80 g.

[0071] S6. Perform a fuel pollution test according to fuel pollution test parameters, pollutant amounts and pollutant components through a fuel pollution test device, obtain a fuel pollution test result, and determine whether the fuel pollution test is qualified according to the fuel pollution test result.

[0072] The fuel pollution test device is used to perform the fuel pollution test according to the fuel pollution test parameters, the pollutant amount and the pollutant composition, and comprises the following steps:

[0073] Adding pollutants into the fuel pollution test device according to the pollutant amount and the pollutant composition, and installing the test piece into the fuel pollution test device;

[0074] The test piece is installed at the test position in the fuel contamination test device, and the specific installation needs to be based on the structure of the fuel contamination test device. In this embodiment, the test piece is installed in the fuel contamination test device, and is respectively connected to the oil injection module, the pollutant injection module, the control module, the clogging indication alarm and the fuel recovery module.

[0075] Set the test hours according to the maximum endurance of the engine;

[0076] The fuel pump regulator fuel contamination test is to verify the ability of the fuel pump regulator to tolerate contaminated fuel under the maximum contamination level of the engine. Therefore, the maximum flight time of the aircraft equipped with the engine should be selected as the test hours. Because during the maximum flight time of the aircraft equipped with the engine, if the fuel pump regulator is damaged due to various reasons, such as wear of components, excess materials enter the fuel, and the used fuel is contaminated. However, the fuel filter cannot be cleaned or replaced during this period, and new fuel cannot be replaced. Therefore, only by verifying the ability of the fuel pump regulator to tolerate contaminated fuel during the maximum flight time can the safety of the entire engine and even the aircraft be guaranteed. The fuel contamination test time should start from the blockage indication alarm and end at the maximum flight time of the aircraft equipped with the engine. That is, in this embodiment, the test hours are set to 10h.

[0077] The inlet fuel flow rate and fuel pressure of the fuel pump regulator are set according to the fuel flow rate in the take-off state and the inlet pressure in the take-off state;

[0078] In this embodiment, the inlet fuel flow rate is set to 8000L / h and the fuel pressure is set to 0.33MPa.

[0079] Conduct fuel contamination tests based on test hours, inlet fuel flow and fuel pressure;

[0080] When the fuel contamination test is performed, the fuel contamination test device continuously injects contaminants and fuel into the inlet pipeline of the fuel pump regulator.

[0081] The fuel contamination test is carried out until the test hours are reached; during the fuel contamination test, if there is oil leakage or the fuel pump regulator does not work properly, the test must be terminated in advance.

[0082] The fuel contamination test results include: fuel pump regulator performance parameters and precision parts clearance;

[0083] Determining whether the fuel contamination test is qualified based on the fuel contamination test result specifically refers to: determining whether the performance parameters of the fuel pump regulator and the clearance of the precision parts meet the factory requirements of the fuel pump regulator.

[0084] The fuel pump regulator is disassembled and cleaned, and its parts are checked for damage. After reassembly, performance debugging is performed. The fuel pump regulator has undergone a fuel contamination test. Due to normal wear of the components in the pump, as long as the performance parameters and clearance of the precision parts of the fuel pump regulator meet the factory requirements of the fuel pump regulator, the fuel pump regulator is considered to have passed the fuel contamination test.

[0085] The fuel pump regulator performance parameters include: differential pressure valve, maximum speed port reduction value, minimum fuel supply change value, maximum fuel supply change value, speed sensitivity change value, cooperative working time deviation value of follow-up mechanism and fuel quantity deviation value of pressure distribution valve;

[0086] The precision parts clearance includes: the clearance value of the precision valve pair, the clearance value increase between the throttle start and the bushing, the clearance source between the hydraulic delay rod and the bushing, the radial clearance change value between the bearing pin and the bearing housing, and the wear amount of the swash plate bearing.

[0087] In this embodiment, the swash plate bearing is also allowed to have "vertical tree-shaped" marks on the steel ball raceway.

[0088] like Figure 2 A schematic diagram of a fuel contamination test device for an engine fuel pump regulator provided by the present invention, which is used to implement the above-mentioned fuel contamination test method, comprises: an oil injection module, a pollutant injection module, a control module and a blockage indication alarm; the oil injection module and the pollutant injection module are respectively connected to a test piece, the blockage indication alarm is connected to the test piece, and the control module is respectively connected to the oil injection module, the pollutant injection module, the test piece and the blockage indication alarm;

[0089] The oil injection module is used to inject fuel into the test piece;

[0090] The pollutant injection module is used to inject pollutants into the test piece;

[0091] The blockage indication alarm is used to indicate that the test piece is blocked and to start the test;

[0092] During the fuel contamination test, when the fuel and pollutants enter the test piece through the fuel injection module and the pollutant injection module respectively, the blockage indication alarm starts to alarm. The blockage indication alarm starts to count down after the alarm starts, and stops when the test hours are reached; during the fuel contamination test, if there is oil leakage or the fuel pump regulator does not work properly, the test should be terminated in advance.

[0093] The pollutant injection module includes: a mud injection system and a salt water injection system; the mud injection system and the salt water injection system are respectively connected to the test piece;

[0094] The slurry injection system is used to inject slurry contaminants into the test piece;

[0095] The saline injection system is used to inject saline contaminants into a test piece.

[0096] The control module is used to control the oil injection module, the pollutant injection module, the test piece and the fuel recovery module, receive the signal of the blockage indication alarm, and control the fuel contamination test.

[0097] It also includes a fuel recovery module, which is connected to the test piece and the oil injection module respectively:

[0098] The fuel recovery module is used to recover the fuel used in the fuel contamination test and transport it to the oil injection module.

[0099] The fuel recovery module converts the contaminated fuel into clean fuel through filtration, heat exchange and water removal, and delivers the clean fuel to the fuel injection module.

[0100] The present invention realizes the fuel contamination test of the fuel pump regulator, evaluates the working ability of the aircraft engine fuel pump regulator after being exposed to contaminated fuel, ensures the flight safety of the aircraft engine under various typical mission profiles of the aircraft, and ensures the safety of the aircraft engine.

Claims

1. A fuel contamination test method for an engine fuel pump regulator, characterized in that: The following steps are involved: S1. Obtain the technical status of the test piece, start the fuel contamination test device, and adjust the fuel contamination test device according to the technical status of the test piece; S2. Calibrate and clean the fuel pollution test device; S3, obtaining the working condition of the fuel pump regulator and the possible contamination of the used fuel, and determining the contamination components according to the working condition of the fuel pump regulator and the possible contamination of the used fuel; S4. Obtaining fuel contamination test parameters, wherein the fuel contamination parameters include the maximum endurance time of the engine, the total amount of test fuel, the fuel flow rate in the take-off state, and the inlet pressure in the take-off state; S5. Setting a pollution amount calculation formula, and calculating the pollutant amount value according to the fuel pollution parameter and the pollution amount calculation formula; S6. Perform a fuel pollution test according to fuel pollution test parameters, pollutant amounts and pollutant components through a fuel pollution test device, obtain a fuel pollution test result, and determine whether the fuel pollution test is qualified according to the fuel pollution test result.

2. The fuel contamination test method according to claim 1, characterized in that: The calibration fuel pollution test device comprises: a calibration instrument, a calibration equivalent oil nozzle and a calibration transmission seat.

3. The fuel contamination test method according to claim 1, characterized in that: The method of obtaining the fuel pollution test parameters comprises the following steps: Obtain the aircraft model, and determine the fuel tank size, engine typical mission cycle, and engine maximum flight time based on the aircraft model; Determine the total amount of test fuel according to the size of the fuel tank; Determine the takeoff fuel flow and takeoff inlet pressure based on the typical engine mission cycle.

4. The fuel contamination test method according to claim 1, characterized in that: The pollution amount calculation formula is as follows: Among them, M is the pollutant value, T is the maximum endurance of the engine, and F is the fuel flow rate at takeoff.

5. The fuel contamination test method according to claim 1, characterized in that: The fuel pollution test device is used to perform the fuel pollution test according to the fuel pollution test parameters, the pollutant amount and the pollutant composition, and comprises the following steps: Adding pollutants into the fuel pollution test device according to the pollutant amount and the pollutant composition, and installing the test piece into the fuel pollution test device; Set the test hours according to the maximum endurance of the engine; The inlet fuel flow rate and fuel pressure of the fuel pump regulator are set according to the fuel flow rate in the take-off state and the inlet pressure in the take-off state; Conduct fuel contamination tests based on test hours, inlet fuel flow and fuel pressure; When the fuel contamination test is performed, the fuel contamination test device continuously injects contaminants and fuel into the inlet pipeline of the fuel pump regulator.

6. The fuel contamination test method according to claim 1, characterized in that: The fuel contamination test results include: fuel pump regulator performance parameters and precision parts clearance; Determining whether the fuel contamination test is qualified based on the fuel contamination test result specifically refers to: determining whether the performance parameters of the fuel pump regulator and the clearance of the precision parts meet the factory requirements of the fuel pump regulator.

7. The fuel contamination test method according to claim 6, characterized in that: The fuel pump regulator performance parameters include: differential pressure valve, maximum speed port reduction value, minimum fuel supply change value, maximum fuel supply change value, speed sensitivity change value, cooperative working time deviation value of follow-up mechanism and fuel quantity deviation value of pressure distribution valve; The precision parts clearance includes: the clearance value of the precision valve pair, the clearance value increase between the throttle start and the bushing, the clearance source between the hydraulic delay rod and the bushing, the radial clearance change value between the bearing pin and the bearing housing, and the wear amount of the swash plate bearing.

8. An engine fuel pump regulator fuel contamination test device, characterized in that: Used to implement the fuel contamination test method according to any one of claims 1 to 7, comprising: an oil injection module, a pollutant injection module, a control module and a blockage indication alarm; the oil injection module and the pollutant injection module are respectively connected to the test piece, the blockage indication alarm is connected to the test piece, and the control module is respectively connected to the oil injection module, the pollutant injection module, the test piece and the blockage indication alarm; The oil injection module is used to inject fuel into the test piece; The pollutant injection module is used to inject pollutants into the test piece; The blockage indication alarm is used to indicate that the test piece is blocked and to start the test; The control module is used to control the oil injection module, the pollutant injection module, the test piece and the fuel recovery module, receive the signal of the blockage indication alarm, and control the fuel contamination test.

9. The fuel contamination testing device according to claim 8, characterized in that: It also includes a fuel recovery module, which is connected to the test piece and the oil injection module respectively: The fuel recovery module is used to recover the fuel used in the fuel contamination test and transport it to the oil injection module.

10. The fuel contamination testing device according to claim 8, characterized in that: The pollutant injection module includes: a mud injection system and a salt water injection system; the mud injection system and the salt water injection system are respectively connected to the test piece; The slurry injection system is used to inject slurry contaminants into the test piece; The saline injection system is used to inject saline contaminants into a test piece.

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