An apparatus and method for testing an aircraft engine fuel system for contamination

Abstract

The present application relates to a kind of equipment and method for aero-engine fuel system pollution test.The present application includes fuel component import injection pollution pipeline, the injection pollution section being provided with first injection interface and second injection interface;Fuel component, its import end is communicated with fuel component import injection pollution pipeline;Ultrasonic oscillator, install in injection pollution section and between first injection interface and second injection interface;Clean fuel supply system, for providing set pressure and flow according to the requirement of test operating profile Clean fuel;Mud injection system, for injecting set amount of fuel containing solid pollutants according to the flow proportion of clean fuel To first injection interface;Salt water injection system, for injecting set amount of fuel containing salt water pollutants according to the flow proportion of clean fuel To second injection interface.The present application can improve the injection precision of engine fuel system pollution test, while reducing the operation difficulty of injection, reduce test cost.

Description

Technical Field

[0001] This invention relates to the field of aerospace technology, and in particular to an apparatus and method for testing contamination in aircraft engine fuel systems. Background Technology

[0002] The engine fuel system is an important component of an aircraft engine. Contamination of the fuel system can directly affect the normal operation of the engine and may even cause flight safety accidents. Therefore, in the development of the engine fuel system, in addition to taking certain measures in the design to ensure that the fuel cleanliness is within the specified range, it is also necessary to carry out engine fuel system contamination tests in accordance with the relevant requirements for engine airworthiness to verify the ability of the engine fuel system and its components to withstand extreme contamination.

[0003] According to the relevant general specifications for aero-engines, engines should be able to start and operate when using contaminated fuel. Solid contaminants in the fuel consist of iron oxides, crushed quartz, road dust, and cotton fibers, while liquid contaminants include brine. The key to successfully conducting contamination tests is to accurately inject solid contaminants, brine, and clean fuel into the engine fuel inlet in a uniform proportion. Patent application publication number CN 119198098 A mentions a mud injection system for solid contaminant injection and a brine injection system for brine injection, but does not describe their structures.

[0004] In the SAE 749C aircraft turbine engine fuel system component contaminated fuel durability test procedure, refer to Figure 2 As shown, a method for conveying and injecting solid contaminants is introduced. After the solid contaminants are prepared, they are loaded onto a conveyor belt at a rate of grams per inch, and then conveyed to a mud tank for storing solid contaminants. The belt drive speed and the inlet flow rate of the fuel system components are dynamically matched. An agitator built into the mud tank is used to mix the contaminants. This injection method requires that solid contaminants other than cotton fibers should be fully tumbled and mixed, and then evenly distributed along the length of the conveyor. Cotton fibers should be evenly distributed as a separate component along the conveyor, or evenly distributed below other solid particles. The solid contaminant delivery device proposed in SAE 749C is complex and costly. Considering issues such as humidity at the site, cotton fibers may stick to the conveyor belt. It has high requirements for the test site environment, poor reliability, and is difficult to operate. Furthermore, the agitator built into the mud tank causes bubbles to be generated in the oil, which may further lead to uneven injection of contaminants and insufficient injection accuracy.

[0005] The SAE749C aircraft turbine engine fuel system component contaminated fuel durability test procedure introduces a brine injection method. A brine solution of a certain concentration is stored in a brine tank and injected directly into the inlet of the engine fuel system component through a metering pump. Since the brine content in the fuel is required to be 0.01%, the brine content is very small. Direct injection into the inlet pipeline makes it difficult to inject the brine evenly into the test component inlet, resulting in insufficient contamination injection precision.

[0006] During engine fuel system contamination tests, the flow rate of the inlet pipe varies depending on the fuel system components and the operating conditions of the same fuel system components. The smaller the flow rate, the more obvious the deposition and adhesion of contaminants in the inlet pipe, which can lead to uneven contaminant injection, insufficient injection precision, and the need for frequent disassembly and cleaning of the injection pipe. Summary of the Invention

[0007] Therefore, the present invention provides an apparatus and method for testing contamination in aero-engine fuel systems, which can improve the accuracy of contamination injection in engine fuel system contamination tests, while reducing the difficulty of contamination injection operations and lowering test costs.

[0008] To solve the above-mentioned technical problems, the present invention provides an apparatus for testing contamination in an aircraft engine fuel system, comprising: The fuel component inlet sludge injection pipeline is equipped with a sludge injection section having a first injection port and a second injection port; The fuel component has its inlet end connected to the fuel component's inlet sewage injection pipe; An ultrasonic oscillator is installed in the sludge injection section and located between the first injection port and the second injection port, for applying ultrasonic waves to the oil in the sludge injection section to cause the oil to vibrate. A clean fuel supply system is used to provide clean fuel at a set pressure and flow rate according to the requirements of the test operating condition spectrum; A mud injection system is used to inject a set amount of fuel containing solid contaminants into the first injection port in proportion to the flow rate of clean fuel. The brine injection system is used to inject a set amount of fuel containing brine contaminants into the second injection port in proportion to the flow rate of clean fuel.

[0009] In one embodiment of the present invention, the mud injection system includes a mud tank, a first circulating pump, a first filter, a first switching valve, a second switching valve, a first radiator, and a first metering pump; The first end of the mud oil tank is connected to the first injection port via the first metering pump. The second end of the mud oil tank is sequentially connected to the first radiator, the first filter, the first switching valve, the first circulating pump, and the first end of the mud oil tank. The first radiator, the second switching valve, and the first circulating pump are connected in sequence; The clean fuel supply system includes a first interface that communicates with the third end of the mud tank.

[0010] In one embodiment of the present invention, the mud tank is provided with a solid pollutant fuel filling port and a solid pollutant fuel discharge port, and the mud tank is provided with a first liquid level upper line and a first liquid level lower line.

[0011] In one embodiment of the present invention, the brine injection system includes a brine tank, a second circulation pump, a second filter, a third switching valve, a fourth switching valve, a second radiator, and a second metering pump; The first end of the brine tank is connected to the second injection port via the second metering pump; The first end of the brine tank is sequentially connected to the second radiator, the second filter, the third switching valve, the second circulation pump, and the second end of the brine tank. The second radiator, the fourth switching valve, and the second circulating pump are connected in sequence; The clean fuel supply system includes a second interface connected to the third end of the brine tank.

[0012] In one embodiment of the present invention, the brine injection system further includes a brine tank and a third metering pump, wherein the fourth end of the brine tank is connected to the brine tank via the third metering pump.

[0013] In one embodiment of the present invention, the brine tank is provided with a brine filling port and a brine discharge port; the brine fuel tank is provided with a brine contaminant fuel discharge port; and the brine fuel tank is provided with a second upper liquid level line and a second lower liquid level line.

[0014] In one embodiment of the present invention, the sludge injection section is inclined to the horizontal plane, and the height of the first injection port is higher than the height of the second injection port.

[0015] In one embodiment of the present invention, the angle of the sludge injection section relative to the horizontal plane is 45°.

[0016] In one embodiment of the present invention, the fuel component inlet sludge injection pipeline further includes a horizontal section connected to the sludge injection section. The horizontal section is connected to the inlet end of the fuel component. A return oil pipeline is provided between the outlet end of the fuel component and the fuel tank of the clean fuel supply system. A third filter, an oil-water separator, a third radiator, and a flow meter are sequentially arranged on the return oil pipeline.

[0017] The present invention also provides a method for testing contamination in an aircraft engine fuel system, utilizing the aforementioned equipment for testing contamination in an aircraft engine fuel system, the method comprising the following steps: Preparation of fuel oil contaminated by mud: Before the test begins, clean fuel is injected into the mud tank to the upper limit of the first liquid level. Fuel containing solid contaminants is prepared in a measuring cup according to the set ratio and poured into the mud tank through the solid contaminant fuel filling port. The first switching valve is closed and the second switching valve is opened. The first circulation pump is started to circulate the solid contaminants in the mud tank so that they are evenly distributed. Preparation of fuel contaminated with brine: Before the test begins, clean fuel is injected into the brine tank to the upper limit of the second liquid level. A brine of a set concentration is prepared in the brine tank. The brine is injected into the brine tank in proportion through the third metering pump. In the brine tank, the brine and clean fuel are mixed. The third switching valve is closed and the fourth switching valve is opened. The second circulation pump is started. The oil-water mixture in the brine tank is fully homogenized through circulation. Injection of contaminated fuel during the test: According to the instructions of the control system, the first metering pump is started to inject fuel containing solid contaminants into the fuel component inlet sludge injection line through the first injection interface at a set flow rate; the second metering pump is started to inject fuel containing brine contaminants into the fuel component inlet sludge injection line through the second injection interface at a set flow rate. During the test, the ultrasonic oscillator applies ultrasonic waves of a set frequency to the oil in the sewage injection section. The vibration level is adjusted according to different flow rates to prevent contaminants from adhering and depositing on the pipe wall, so that the contaminants are evenly mixed and enter the inlet end of the fuel component with the fluid. Fuel circulation and fluid replenishment: During the experiment, when the fuel level in the mud tank is lower than the first lower limit, clean fuel is added to the first upper limit through the clean fuel supply system. The prepared mud fuel is then poured into the mud tank in the same manner as above, with a predetermined interval between the two operations. The brine tank is used continuously after one preparation. End of experiment and cleaning: After the test, the first circulation pump and the first metering pump were stopped, the solid pollutant fuel discharge port was opened, and the contaminated fuel in the mud tank was released. At the same time, clean fuel was injected into the mud tank to the first liquid level line, the first switching valve was opened and the second switching valve was closed, the first circulation pump was started, and the circulation was carried out for a predetermined time to clean the mud tank and the corresponding pipeline, so that the fuel in the mud tank was filtered into clean fuel, in preparation for the start of the next test. After the test, the second circulation pump and the second metering pump are stopped, the brine contaminated fuel discharge port is opened, and the contaminated fuel in the brine tank is released. At the same time, clean fuel is injected into the brine tank to the second liquid level line. The third switching valve is opened and the fourth switching valve is closed. The second circulation pump is started and circulated for a predetermined time to clean the brine tank and corresponding pipelines, so that the fuel in the brine tank is filtered into clean fuel, in preparation for the start of the next test.

[0018] The technical solution of the present invention has the following advantages compared with the prior art: The present invention provides an equipment and method for testing contamination in an aircraft engine fuel system. This method enables solid contaminants and brine to be fully mixed with clean fuel, forming a uniform contaminated fuel that enters the fuel component inlet, thus improving the accuracy of contamination injection during the test. After the test, the fuel tanks and pipelines of the mud injection system and the brine injection system can be self-cleaned. The injection of solid contaminants and brine is simple in principle, easy to implement, and has no strict requirements on the humidity of the test site. It also eliminates the need for frequent disassembly and cleaning of the contamination injection pipelines.

[0019] This invention, by installing an ultrasonic oscillator in the fuel component inlet contamination pipeline, ensures that solid contaminants and brine contaminants are fully mixed and evenly distributed before entering the fuel component. This avoids the problem of contaminants adhering to the pipe wall or localized deposition, significantly improving the mixing uniformity and injection accuracy of contaminated fuel, and ensuring the accuracy and repeatability of test data.

[0020] After the test, the mud injection system and brine injection system can be controlled by switching valves and cooperate with the circulation pump to achieve automatic cleaning of the oil tank and pipelines. This can remove residual contaminants without disassembly, allowing the system to quickly return to a clean state and prepare for the next test, reducing the amount of manual cleaning work. Attached Figure Description

[0021] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the device used for testing contamination in the fuel system of an aircraft engine according to the present invention.

[0023] Figure 2This is a schematic diagram illustrating a solid contaminant transfer and refueling method as described in SAE 749C.

[0024] Figure 3 This is a schematic diagram of the mud injection system of the equipment for testing contamination in aero-engine fuel systems according to the present invention.

[0025] Figure 4 This is a schematic diagram of the brine injection system of the device for testing contamination in the fuel system of an aircraft engine, according to the present invention.

[0026] Figure 5 This invention relates to the structure of the fuel component inlet contamination pipeline for an equipment used in aero-engine fuel system contamination testing.

[0027] Explanation of reference numerals on the accompanying drawings: 101. Scraper; 102. Discharge roller; 103. Plastic guide chute; 104. Feed box; 105. Rewinding roller; 106. Drive unit; 107. Explosion-proof heating source; 108. Contaminant placement device; 109. Roller; 110. Fuel flow signal; 111. Explosion-proof DC speed-regulating geared motor; 1. Fuel component inlet sludge injection pipe; 11. Sludge injection section; 12. First injection port; 13. Second injection port; 2. Fuel components; 3. Ultrasonic oscillator; 4. Clean fuel supply system; 41. First interface; 42. Second interface; 5. Mud injection system; 51. Mud tank; 511. Solid pollutant fuel filler port; 512. Solid pollutant fuel discharge port; 513. First liquid level upper line; 514. First liquid level lower line; 52. First circulation pump; 53. First filter; 54. First switching valve; 55. Second switching valve; 56. First radiator; 57. First metering pump; 6. Brine injection system; 61. Brine tank; 611. Second liquid level upper line; 612. Second liquid level lower line; 613. Brine contaminant fuel discharge port; 62. Second circulation pump; 63. Second filter; 64. Third switching valve; 65. Fourth switching valve; 66. Second radiator; 67. Second metering pump; 68. Brine tank; 681. Brine filling port; 682. Brine discharge port; 69. Third metering pump; 7. Control system. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0029] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0030] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0032] Example 1 Reference Figure 1 , Figure 5 As shown, this embodiment provides an apparatus for testing contamination in an aircraft engine fuel system, comprising: The fuel component inlet sewage injection pipeline 1 is provided with a sewage injection section 11 having a first injection port 12 and a second injection port 13; Fuel component 2, the inlet end of which is connected to the fuel component inlet sewage injection pipe 1; An ultrasonic oscillator 3 is installed in the sludge injection section 11 and located between the first injection port 12 and the second injection port 13. It is used to apply ultrasonic waves to the oil in the sludge injection section 11 to make the oil vibrate. The vibration level can be adjusted according to different flow rates. By applying ultrasonic waves of a certain frequency, the ultrasonic waves propagate in the oil, causing the oil to vibrate within a certain range, and further making the contaminants and fuel uniformly mixed before flowing into the inlet end of the fuel component 2. Clean fuel supply system 4 is used to provide clean fuel at a set pressure and flow rate according to the requirements of the test operating condition spectrum; The mud injection system 5 is used to inject a set amount of fuel containing solid contaminants into the first injection port 12 in proportion to the flow rate of clean fuel. The brine injection system 6 is used to inject a set amount of fuel containing brine contaminants into the second injection port 13 in proportion to the flow rate of clean fuel.

[0033] Specifically, refer to Figure 3 As shown, the mud injection system 5 includes a mud tank 51, a first circulation pump 52, a first filter 53, a first switching valve 54, a second switching valve 55, a first radiator 56, and a first metering pump 57. The first end of the mud oil tank 51 is connected to the first injection port 12 via the first metering pump 57. The second end of the mud oil tank 51 is sequentially connected to the first radiator 56, the first filter 53, the first switching valve 54, the first circulating pump 52, and the first end of the mud oil tank 51. The first radiator 56, the second switching valve 55, and the first circulating pump 52 are connected in sequence; The clean fuel supply system 4 includes a first interface 41 connected to the third end of the mud tank 51, so that a portion of the clean fuel enters the mud tank 51 of the mud injection system 5 through the first interface 41 according to the requirements of the control system 7 (such as PLC), forming a uniformly mixed polluted fuel in the mud injection system 5.

[0034] Specifically, the mud tank 51 is provided with a solid pollutant fuel filling port 511 and a solid pollutant fuel discharge port 512, and the mud tank 51 is provided with a first liquid level upper line 513 and a first liquid level lower line 514.

[0035] During the test, the mud injection system 5 ensures the uniform distribution of pollutants in the mud tank 51 through the continuous circulation of the first circulation pump 52, which improves the injection accuracy of solid pollutants in the test. At the same time, the mixed pollutant fuel oil only needs to be poured into the mud tank 51 on time, making the operation relatively simple and reliable. It does not require the replication transmission device proposed by SAE749C and has low requirements for environmental conditions such as humidity.

[0036] Specifically, refer to Figure 4 As shown, the brine injection system 6 includes a brine tank 61, a second circulation pump 62, a second filter 63, a third switching valve 64, a fourth switching valve 65, a second radiator 66, and a second metering pump 67. The first end of the brine tank 61 is connected to the second injection port 13 via the second metering pump 67. The first end of the brine tank 61 is sequentially connected to the second radiator 66, the second filter 63, the third switching valve 64, the second circulation pump 62, and the second end of the brine tank 61. The second radiator 66, the fourth switching valve 65, and the second circulating pump 62 are connected in sequence; The clean fuel supply system 4 includes a second interface 42 that communicates with the third end of the brine tank 61, so that a portion of the clean fuel enters the brine tank 61 of the brine injection system 6 through the second interface 42 as required by the control system 7, forming a uniformly mixed contaminated fuel in the brine injection system 6.

[0037] Specifically, the brine injection system 6 further includes a brine tank 68 and a third metering pump 69, and the fourth end of the brine tank 61 is connected to the brine tank 68 through the third metering pump 69.

[0038] Specifically, the brine tank 68 is provided with a brine filling port 681 and a brine discharge port 682; the brine fuel tank 61 is provided with a brine contaminant fuel discharge port 613, and the brine fuel tank 61 is provided with a second upper liquid level line 611 and a second lower liquid level line 612.

[0039] The brine injection system 6 is used to prepare contaminated fuel containing a certain concentration of brine and to ensure that the contaminated fuel is injected into the fuel component 2 in a stable and reliable manner at a certain adjustable and controllable flow rate.

[0040] Specifically, refer to Figure 5 As shown, the sludge injection section 11 is inclined to the horizontal plane, and the height of the first injection port 12 is higher than the height of the second injection port 13. Preferably, the angle of the sludge injection section 11 relative to the horizontal plane is 45°.

[0041] By setting the angle of the sludge injection section 11 relative to the horizontal plane to 45° and installing an ultrasonic oscillator 3 after the solid contaminant injection point, the vibration level can be adjusted according to different flow rates. By applying ultrasonic waves of a certain frequency, the ultrasonic waves propagate in the oil, causing the oil to vibrate within a certain range, thereby causing contaminant particles to detach from the wall surface and better enter the fuel component 2 with the liquid flow. This avoids the solid contaminants injected into the fuel component inlet sludge injection pipe 1 at low flow rates from adhering and accumulating on the inner wall of the pipe, and then being flushed into the inlet end of the engine fuel component 2 at high flow rates, resulting in uneven sludge injection. This improves the sludge injection accuracy and reduces the adhesion of contaminants on the sludge injection pipe, thus reducing the frequency of disassembly and cleaning of the sludge injection pipe.

[0042] Specifically, the fuel component inlet sludge injection pipe 1 also includes a horizontal section connected to the sludge injection section 11. This horizontal section is connected to the inlet end of the fuel component 2. A return oil pipe is provided between the outlet end of the fuel component 2 and the fuel tank of the clean fuel supply system 4. A third filter, an oil-water separator, a third radiator, and a flow meter are sequentially installed on the return oil pipe. After passing through the fuel component 2, the contaminated fuel passes through the third filter, oil-water separator, third radiator, flow meter, and other components, forming clean fuel that returns to the fuel tank of the clean fuel system.

[0043] This equipment for testing contamination in aircraft engine fuel systems allows solid contaminants and brine to be thoroughly mixed with clean fuel, forming a uniform contaminated fuel that enters the fuel component 2 inlet, thus improving the accuracy of contamination injection during testing. After the test, the tanks and pipelines of the mud injection system 5 and the brine injection system 6 can be self-cleaned. The injection of solid contaminants and brine is simple in principle, easy to implement, and has no strict requirements on the humidity of the test site. There is no need to frequently disassemble and clean the contamination injection pipelines.

[0044] Example 2 The present invention also provides a method for testing contamination in an aircraft engine fuel system, utilizing the aforementioned equipment for testing contamination in an aircraft engine fuel system, the method comprising the following steps: (1) Preparation of fuel oil contaminated by mud: Before the test begins, clean fuel is injected into the mud tank 51 to the first liquid level line 513. Fuel containing solid pollutants is prepared in a measuring cup according to a set ratio and poured into the mud tank 51 through the solid pollutant fuel filling port 511. The first switching valve 54 is closed and the second switching valve 55 is opened. The first circulation pump 52 is started to circulate the solid pollutants in the mud tank 51 so that they are evenly distributed.

[0045] (2) Preparation of fuel oil contaminated by brine: Before the test begins, clean fuel is injected into the brine tank 61 to the second liquid level upper line 611. A brine of a set concentration is prepared in the brine tank 68. The brine is injected into the brine tank 61 in proportion through the third metering pump 69. In the brine tank 61, the brine and clean fuel are mixed. The third switching valve 64 is closed and the fourth switching valve 65 is opened. The second circulation pump 62 is started to circulate the brine tank 61 to make the oil-water mixture in the brine tank 61 fully uniform.

[0046] (3) Injection of contaminated fuel during the test: According to the instructions of the control system 7, the first metering pump 57 is started to inject fuel containing solid contaminants into the fuel component inlet sludge injection line 1 through the first injection port 12 at a set flow rate; the second metering pump 67 is started to inject fuel containing brine contaminants into the fuel component inlet sludge injection line 1 through the second injection port 13 at a set flow rate. During the test, the ultrasonic oscillator 3 applies ultrasonic waves of a set frequency to the oil in the sewage injection section 11. The vibration level is adjusted according to different flow rates to prevent contaminants from adhering and depositing on the pipe wall, so that the contaminants are evenly mixed and enter the inlet end of the fuel component 2 with the fluid. (4) Fuel circulation and fluid replenishment: During the experiment, when the fuel level in the mud tank 51 is lower than the first lower level 514, clean fuel is added to the first upper level 513 through the clean fuel supply system 4. The prepared mud fuel is then poured into the mud tank 51 in the same manner as above, and the interval between the two operations is predetermined; for example, by reasonably setting the volume of the tank, the time interval between the two operations is greater than two hours.

[0047] The brine tank 61 can be used continuously after one preparation. In this embodiment, before the test starts, the ratio of brine to clean fuel in the brine tank 61 is 1:9. After the test starts, according to the requirements of the control system 7, the brine is injected into the inlet pipe of the fuel component 2 through the second metering pump 67 at a flow rate of 10 times. Since the brine concentration in the pollutants is very low, after the brine tank 61 completes one preparation, it can meet the test requirements for more than 100 hours without the need for multiple operations during the test.

[0048] It should be noted that during the test, the brine injection system 6 ensures the uniform distribution of contaminants in the brine tank 61 through the continuous circulation of the second circulation pump 62. In addition, since the brine injection volume is very small, in the contamination test of the fuel component 2 of a certain model of engine, the minimum brine injection volume is only 7ml / min. If the brine enters the inlet pipe of the fuel component 2 in the form of droplets, the brine cannot fully mix with the fuel in the inlet pipe, causing it to quickly settle to the bottom of the pipe and roll along the wall, resulting in large sampling errors and low contamination injection accuracy. The brine injection system pre-mixes the oil and brine in the brine tank 61 at a ratio of 9:1 and stirs it with the second circulation pump 62 to form an oil-water emulsion. Then, it is injected into the system at a flow rate of 10 times (referring to 10 times the amount of brine before mixing when the oil and brine are mixed at a ratio of 9:1). This improves the injection accuracy without changing the injection volume.

[0049] (5) End of test and cleaning: After the test, the first circulation pump 52 and the first metering pump 57 are stopped, the solid pollutant fuel discharge port 512 is opened to release the contaminated fuel in the mud tank 51; at the same time, clean fuel is injected into the mud tank 51 to the first liquid level line 513, the first switching valve 54 is opened and the second switching valve 55 is closed, the first circulation pump 52 is started, and the circulation is carried out for a predetermined time to clean the mud tank 51 and the corresponding pipeline, so that the fuel in the mud tank 51 is filtered into clean fuel, in preparation for the start of the next test; After the test, the second circulation pump 62 and the second metering pump 67 are stopped, the brine contaminated fuel discharge port is opened, and the contaminated fuel in the brine tank 61 is released. At the same time, clean fuel is injected into the brine tank 61 to the second liquid level line 611. The third switching valve 64 is opened and the fourth switching valve 65 is closed. The second circulation pump 62 is started and circulated for a predetermined time to clean the brine tank 61 and the corresponding pipeline, so that the fuel in the brine tank 61 is filtered into clean fuel, preparing for the start of the next test.

[0050] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for testing contamination in an aircraft engine fuel system, characterized in that, include: The fuel component inlet sewage injection pipeline (1) is provided with a sewage injection section (11) having a first injection port (12) and a second injection port (13). The fuel component (2) has its inlet end connected to the fuel component inlet sewage injection pipe (1); An ultrasonic oscillator (3) is installed in the sludge injection section (11) and located between the first injection port (12) and the second injection port (13) for applying ultrasonic waves to the oil in the sludge injection section (11) to make the oil vibrate. Clean fuel supply system (4) is used to provide clean fuel at a set pressure and flow rate according to the requirements of the test operating condition spectrum; The mud injection system (5) is used to inject a set amount of fuel containing solid contaminants into the first injection port (12) in proportion to the flow rate of clean fuel. The brine injection system (6) is used to inject a set amount of fuel containing brine contaminants into the second injection port (13) in proportion to the flow rate of clean fuel. The mud injection system (5) includes a mud tank (51), a first circulation pump (52), a first filter (53), a first switching valve (54), a second switching valve (55), a first radiator (56), and a first metering pump (57). The first end of the mud oil tank (51) is connected to the first injection port (12) via the first metering pump (57). The second end of the mud oil tank (51) is sequentially connected to the first radiator (56), the first filter (53), the first switching valve (54), the first circulating pump (52), and the first end of the mud oil tank (51). The first radiator (56), the second switching valve (55), and the first circulating pump (52) are connected in sequence; The clean fuel supply system (4) includes a first interface (41) that communicates with the third end of the mud tank (51). The mud tank (51) is provided with a solid pollutant fuel filling port (511) and a solid pollutant fuel discharge port (512), and the mud tank (51) is provided with a first liquid level upper line (513) and a first liquid level lower line (514). The brine injection system (6) includes a brine tank (61), a second circulation pump (62), a second filter (63), a third switching valve (64), a fourth switching valve (65), a second radiator (66), and a second metering pump (67). The first end of the brine tank (61) is connected to the second injection port (13) via the second metering pump (67). The first end of the brine tank (61) is sequentially connected to the second radiator (66), the second filter (63), the third switching valve (64), the second circulating pump (62), and the second end of the brine tank (61); The second radiator (66), the fourth switching valve (65), and the second circulating pump (62) are connected in sequence; The clean fuel supply system (4) includes a second interface (42) that communicates with the third end of the brine tank (61). The sludge injection section (11) is inclined to the horizontal plane, and the height of the first injection port (12) is higher than the height of the second injection port (13).

2. The equipment for testing contamination in an aircraft engine fuel system according to claim 1, characterized in that, The brine injection system (6) also includes a brine tank (68) and a third metering pump (69), and the fourth end of the brine tank (61) is connected to the brine tank (68) through the third metering pump (69).

3. The equipment for testing contamination in an aircraft engine fuel system according to claim 2, characterized in that, The brine tank (68) is provided with a brine filling port (681) and a brine discharge port (682); the brine oil tank (61) is provided with a brine pollutant fuel discharge port (613); and the brine oil tank (61) is provided with a second upper liquid level line (611) and a second lower liquid level line (612).

4. The equipment for testing contamination in an aircraft engine fuel system according to claim 1, characterized in that, The angle of the sewage injection section (11) relative to the horizontal plane is 45°.

5. The equipment for testing contamination in an aircraft engine fuel system according to claim 1, characterized in that, The fuel component inlet sludge injection pipeline (1) also includes a horizontal section connected to the sludge injection section (11). The horizontal section is connected to the inlet end of the fuel component (2). A return oil pipeline is provided between the outlet end of the fuel component (2) and the oil tank of the clean fuel supply system (4). A third filter, an oil-water separator, a third radiator, and a flow meter are sequentially provided on the return oil pipeline.

6. A method for testing contamination in an aircraft engine fuel system, characterized in that, Using the apparatus for testing contamination in an aircraft engine fuel system according to any one of claims 1-5, the testing method includes the following steps: Preparation of fuel oil contaminated by mud: Before the test begins, clean fuel is injected into the mud tank (51) to the first liquid level line (513). Fuel containing solid pollutants is prepared in a measuring cup according to the set ratio and poured into the mud tank (51) through the solid pollutant fuel filling port (511). The first switching valve (54) is closed and the second switching valve (55) is opened. The first circulation pump (52) is started to circulate the solid pollutants in the mud tank (51) so that they are evenly distributed. Preparation of fuel contaminated with brine: Before the test begins, clean fuel is injected into the brine tank (61) to the upper limit of the second liquid level (611). A brine of a set concentration is prepared in the brine tank (68). The brine is injected into the brine tank (61) in proportion by the third metering pump (69). The brine and clean fuel are mixed in the brine tank (61). The third switching valve (64) is closed and the fourth switching valve (65) is opened. The second circulation pump (62) is started. The oil-water mixture in the brine tank (61) is fully homogenized through circulation. Injection of contaminated fuel during the test: According to the instructions of the control system, the first metering pump (57) is started to inject fuel containing solid contaminants into the fuel component inlet sewage injection line (1) through the first injection port (12) at a set flow rate; the second metering pump (67) is started to inject fuel containing brine contaminants into the fuel component inlet sewage injection line (1) through the second injection port (13) at a set flow rate. During the test, the ultrasonic oscillator (3) applies ultrasonic waves of a set frequency to the oil in the sewage injection section (11). The vibration level is adjusted according to different flow rates to prevent contaminants from adhering and depositing on the pipe wall, so that the contaminants are evenly mixed and enter the inlet end of the fuel component (2) with the fluid. Fuel circulation and fluid replenishment: During the experiment, when the fuel level in the mud tank (51) is lower than the first lower level (514), clean fuel is added to the first upper level (513) through the clean fuel supply system (4). The prepared mud fuel is poured into the mud tank (51) in the same way as above, and the interval between the two operations is a predetermined time. The brine tank (61) is used continuously after one preparation. End of experiment and cleaning: After the test, the first circulation pump (52) and the first metering pump (57) are stopped, the solid pollutant fuel discharge port (512) is opened, and the polluted fuel in the mud tank (51) is discharged. At the same time, clean fuel is injected into the mud tank (51) to the first liquid level line (513), the first switching valve (54) is opened and the second switching valve (55) is closed, the first circulation pump (52) is started, and the circulation is carried out for a predetermined time to clean the mud tank (51) and the corresponding pipeline, so that the fuel in the mud tank (51) is filtered into clean fuel, and preparations are made for the start of the next test. After the test, control the second circulation pump (62) and the second metering pump (67) to stop working, open the brine contaminated fuel discharge port, and release the contaminated fuel in the brine tank (61); at the same time, inject clean fuel into the brine tank (61) to the second liquid level upper line (611), control the opening of the third switching valve (64) and the closing of the fourth switching valve (65), start the second circulation pump (62), circulate for a predetermined time, clean the brine tank (61) and the corresponding pipeline, so that the fuel in the brine tank (61) is filtered into clean fuel, and prepare for the start of the next test.

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