An in vitro fuel filling system and filling method for core engine testing

Abstract

The present application provides an external fuel filling system and method for core engine testing, belonging to the technical field of core engine testing. The external fuel filling system includes: a front switching valve, an oil-gas separator, a small-dose check valve, a small-dose switching valve, a small-dose oiler, a small-dose main safety pressure relief valve, a small-dose secondary safety pressure relief valve, a small-dose regulating valve, a large-dose check valve, a large-dose switching valve, a large-dose oiler, a large-dose main safety pressure relief valve, a large-dose secondary safety pressure relief valve, a large-dose regulating valve, an oil leak collector, a rear check valve, a fuel flow meter, and a solenoid valve. Compared with core engine fuel supply methods in the prior art, the external fuel filling system and method provided by the present application have the advantages of a large fuel quantity adjustment range and flexible adjustment, can well meet the needs of core engine testing, and further improve the safety and reliability of core engine testing.

Description

Technical Field

[0001] The present application belongs to the technical field of core engine testing, and in particular relates to an in vitro fuel filling system and filling method for core engine testing. Background Art

[0002] An aircraft engine core primarily consists of three components: the high-pressure compressor, the combustion chamber, and the high-pressure turbine. When conducting independent core engine testing, these three components are supplemented with the air intake casing, central transmission system, turbine rear casing, accessory casing, fuel control system, lubrication system, and starting system. During testing, air enters the high-pressure compressor, where it is compressed and then injected into the combustion chamber where fuel is burned, generating high-temperature combustion gases. These gases expand and generate work in the high-pressure turbine, driving the coaxial high-pressure compressor. Simultaneously, the fuel control system is driven by the power takeoff shaft, continuously delivering fuel to the combustion chamber for injection and combustion.

[0003] Normally, when supplying fuel, the core engine fuel control system must follow the pre-set speed-fuel control law, that is, the speed and fuel supply amount have a one-to-one correspondence. Based on the premise that the above relationship remains basically unchanged, the fuel supply amount at the same speed can be slightly adjusted, but the amplitude is limited. When conducting certain special types of core engine tests, it is necessary to supply fuel to the combustion chamber that exceeds the normal supply limit while keeping the speed basically unchanged. However, the fuel supply of the core engine's own fuel control system cannot be significantly increased, which will not meet the test requirements and make it impossible to carry out related test content. In addition, under the condition that the speed remains basically unchanged, the fuel supply of the core engine's own fuel control system must be given according to the fuel supply law and cannot be flexibly adjusted during the core engine test. Summary of the Invention

[0004] The purpose of this application is to provide an in vitro fuel filling system and filling method for core engine testing to solve or alleviate at least one problem in the background technology.

[0005] The technical solution of the present application is: an external fuel filling system for core engine testing, the external fuel filling system comprising: a front switch valve, an oil-gas separator, a small-dose check valve, a small-dose switch valve, a small-dose oiler, a small-dose main safety pressure relief valve, a small-dose secondary safety pressure relief valve, a small-dose regulating valve and a large-dose check valve, a large-dose switch valve, a large-dose oiler, a large-dose main safety pressure relief valve, a large-dose secondary safety pressure relief valve, a large-dose regulating valve, an oil leakage collector, a rear check valve, a fuel flow meter, and a solenoid valve;

[0006] Among them, the front switch valve, oil-gas separator, rear check valve, fuel flow meter and solenoid valve are arranged in sequence. The front end of the front switch valve is connected to the test bench fuel source, and the end of the solenoid valve is connected to the core engine fuel main pipe.

[0007] The small-dose check valve, the small-dose switch valve and the small-dose regulating valve are sequentially connected to form a small-dose oil injection channel, and the large-dose check valve, the large-dose switch valve and the large-dose regulating valve are sequentially connected to form a large-dose oil injection channel. The small-dose oil injection channel and the large-dose oil injection channel are arranged in parallel between the oil-gas separator and the rear check valve;

[0008] A small-dose lubricator, a small-dose main safety pressure relief valve, and a small-dose secondary safety pressure relief valve are connected between the small-dose switch valve and the small-dose regulating valve; a large-dose lubricator, a large-dose main safety pressure relief valve, and a large-dose secondary safety pressure relief valve are connected between the large-dose switch valve and the large-dose regulating valve; the other ends of the small-dose lubricator and the large-dose lubricator are connected to the driving device respectively, and the other ends of the small-dose main safety pressure relief valve, the small-dose secondary safety pressure relief valve, the large-dose main safety pressure relief valve, and the large-dose secondary safety pressure relief valve are all connected to the oil leakage collector.

[0009] Furthermore, the front switch valve, oil-gas separator, small-dose check valve, small-dose switch valve, small-dose oiler, small-dose main safety pressure relief valve, small-dose secondary safety pressure relief valve, small-dose regulating valve and oil leakage collector, rear check valve, fuel flow meter, and solenoid valve constitute a small-dose oil injection system;

[0010] The front switch valve, oil-gas separator, small-dose check valve, large-dose switch valve, large-dose oiler, large-dose main safety pressure relief valve, large-dose secondary safety pressure relief valve, large-dose regulating valve and oil leakage collector, rear check valve, fuel flow meter, and solenoid valve constitute a large-dose oil injection system.

[0011] Furthermore, the front switch valve, the small-dose switch valve, and the large-dose switch valve are all electric switch valves.

[0012] Furthermore, the small-dose regulating valve and the large-dose regulating valve are electric regulating valves.

[0013] Furthermore, the regulation accuracy of the small-dose switch valve is higher than that of the large-dose switch valve.

[0014] Furthermore, the connection position between the external fuel filling system and the core engine fuel main pipe is set between the fuel control system and the core engine combustion chamber and close to the rear end of the fuel supply check valve on one side of the core engine combustion chamber.

[0015] On the other hand, the technical solution provided by the present application is: an in vitro fuel filling method for core engine testing, the in vitro fuel filling method adopts any of the in vitro fuel filling systems for core engine testing described above, the in vitro fuel filling method includes small-dose fuel extraction, small-dose fuel injection, large-dose fuel extraction, and large-dose fuel injection, wherein:

[0016] The small-dose fuel pumping process is as follows: before starting to pump oil, the front switch valve and the small-dose switch valve are set to the open state, the small-dose regulating valve, the solenoid valve, the large-dose switch valve, and the large-dose regulating valve are set to the closed state, and the small-dose main safety pressure relief valve, the small-dose secondary safety pressure relief valve, the large-dose main safety pressure relief valve, and the large-dose secondary safety pressure relief valve are in the closed state; according to the required fuel injection amount, the length of the piston in the small-dose oiler moving to the left is calculated, and then the piston of the small-dose oiler is driven to move to the left by the driving device. At this time, the fuel in the bench fuel source flows into the pipeline through the front switch valve, and the air mixed in the fuel is discharged when passing through the oil-gas separator, and flows into the rodless chamber of the small-dose oiler through the small-dose switch valve. When the required fuel amount is reached, the driving device stops moving, and the extracted fuel is stored in the rodless chamber of the small-dose oiler, completing the small-dose fuel pumping;

[0017] The small-dose fuel injection process is as follows: before starting fuel injection, the front switch valve, the small-dose switch valve, the large-dose switch valve, and the large-dose regulating valve are set to a closed state, the small-dose regulating valve and the solenoid valve are set to an open state, and the small-dose main safety pressure relief valve, the small-dose secondary safety pressure relief valve, the large-dose main safety pressure relief valve, and the large-dose secondary safety pressure relief valve are in the closed position; based on the required fuel injection amount and injection time, the rightward movement length and movement speed of the piston in the small-dose fuel injector are calculated, and then the piston of the small-dose fuel injector is driven to move to the right by the driving device. At this time, the fuel stored in the rodless chamber of the small-dose fuel injector will flow to the core engine fuel main pipe through the small-dose regulating valve, the rear check valve, the fuel flow meter, and the solenoid valve, thereby achieving small-dose fuel injection;

[0018] The large-dose fuel pumping process is as follows: before starting to pump oil, the front switch valve and the large-dose switch valve are set to the open state, the small-dose switch valve, the small-dose regulating valve, the large-dose regulating valve, and the solenoid valve are set to the closed state, and the small-dose main safety pressure relief valve, the small-dose secondary safety pressure relief valve, the large-dose main safety pressure relief valve, and the large-dose secondary safety pressure relief valve are in the closed state; according to the required fuel injection amount, the length of the piston in the large-dose oiler moving to the left is calculated, and then the piston of the large-dose oiler is driven to move to the left by the driving device. At this time, the fuel in the bench fuel source flows into the pipeline through the front switch valve, and the air mixed in the fuel is discharged when passing through the oil-gas separator, and flows into the rodless chamber of the large-dose oiler through the large-dose switch valve. When the required fuel amount is reached, the driving device stops moving, and the extracted fuel is stored in the rodless chamber of the large-dose oiler, completing the large-dose fuel pumping;

[0019] The high-dose fuel injection process is as follows: before starting the injection, the front switch valve, the small-dose switch valve, the small-dose regulating valve, and the high-dose switch valve are set to the closed state, the large-dose regulating valve and the solenoid valve are set to the open state, and the small-dose main safety pressure relief valve, the small-dose secondary safety pressure relief valve, the large-dose main safety pressure relief valve, and the large-dose secondary safety pressure relief valve are in the closed position; based on the required fuel injection amount and injection time, the rightward movement length and movement speed of the piston in the high-dose lubricator are calculated, and then the piston of the high-dose lubricator is driven to move to the right by the driving device. At this time, the fuel stored in the rodless chamber of the high-dose lubricator will flow to the core engine fuel main pipe through the high-dose regulating valve, the rear check valve, the fuel flow meter, and the solenoid valve, thereby realizing high-dose fuel injection.

[0020] Furthermore, during the small-dose fuel pumping process, the small-dose check valve is used to effectively prevent the fuel in the rodless chamber from flowing back into the rig fuel source;

[0021] During the large-dose fuel pumping process, the large-dose check valve is used to effectively prevent the fuel in the rodless chamber from flowing back into the bench fuel source.

[0022] Furthermore, during the small-dose fuel injection process, when the required injection volume is reached, the drive device stops operating, and the fuel remaining in the rodless chamber of the small-dose fuel injector will no longer enter the core engine fuel manifold;

[0023] When overpressure occurs in the oil injection pipeline, the small-dose main safety pressure relief valve opens first to relieve pressure. If the pipeline is still in an overpressure state, the small-dose secondary safety pressure relief valve opens to further relieve pressure, thereby protecting the safety of the oil injection system.

[0024] When the piston of the small-dose lubricator moves and stops, the rear check valve is used to prevent the fuel in the core engine fuel main from flowing back into the oil injection pipeline.

[0025] Furthermore, during the high-dose fuel injection process, when the required injection volume is reached, the drive device stops operating, and the fuel stored in the rodless chamber of the high-dose fuel injector will no longer enter the core engine fuel manifold;

[0026] When overpressure occurs in the oil injection pipeline, the large-dose main safety pressure relief valve opens first to relieve pressure. If the pipeline is still in an overpressure state, the large-dose secondary safety pressure relief valve opens to further relieve pressure, thereby protecting the safety of the oil injection system.

[0027] When the piston of the high-dose lubricator moves and stops, the rear check valve is used to effectively prevent the fuel in the core engine fuel main from flowing back into the oil injection pipeline.

[0028] Compared with the core engine fuel supply method in the prior art, the in vitro fuel filling system and filling method provided in this application have the advantages of large fuel quantity adjustment range and flexible regulation, which can well meet the needs of core engine testing and further improve the safety and reliability of core engine testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0030] Figure 1 Schematic diagram of the extracorporeal fuel filling system of this application.

[0031] Figure 2 This is a schematic diagram of the connection position between the external fuel filling system and the core engine fuel main pipe in this application.

[0032] Reference numerals:

[0033] 100-External fuel filling system

[0034] 10-Front switch valve

[0035] 20-Oil and gas separator

[0036] 31-Small dose check valve

[0037] 32-Small dose switch valve

[0038] 33-Small dose oiler

[0039] 34-Small dose main safety relief valve

[0040] 35-Small dose secondary safety pressure relief valve

[0041] 36-Small dose regulating valve

[0042] 41-High-dose check valve

[0043] 42-Large dose switch valve

[0044] 43-Large dose oiler

[0045] 44-High-dose main safety relief valve

[0046] 45-High-dose secondary safety pressure relief valve

[0047] 46-Large dose regulating valve

[0048] 50-Oil leak collector

[0049] 60-rear check valve

[0050] 70-Fuel flow meter

[0051] 80-Solenoid Valve DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0053] In response to the problem in the existing technology that the fuel supply method for the core engine cannot significantly increase the fuel supply amount when the speed remains basically unchanged, or the fuel supply amount cannot be flexibly adjusted when the speed remains basically unchanged, the present application provides an in vitro fuel filling system and filling method for core engine testing to overcome the above problems.

[0054] like Figure 1 As shown, the external fuel filling system 100 provided by the present application includes a front switch valve 10, an oil-gas separator 20, a small-dose check valve 31, a small-dose switch valve 32, a small-dose oil injector 33, a small-dose main safety pressure relief valve 34, a small-dose secondary safety pressure relief valve 35, a small-dose regulating valve 36, a large-dose check valve 41, a large-dose switch valve 42, a large-dose oil injector 43, a large-dose main safety pressure relief valve 44, a large-dose secondary safety pressure relief valve 45, a large-dose regulating valve 46, an oil leakage collector 50, a rear check valve 60, a fuel flow meter 70, and a solenoid valve 80. The front switch valve 10, oil-gas separator 20, rear check valve 60, fuel flow meter 70, and solenoid valve 80 are arranged in sequence. The front end of the front switch valve 10 is connected to the rig fuel source, and the rear end of the solenoid valve 80 is connected to the core engine fuel manifold. The small-dose check valve 31, the small-dose switch valve 32 and the small-dose regulating valve 36 are connected in sequence to form a small-dose oil injection channel, and the large-dose check valve 41, the large-dose switch valve 42 and the large-dose regulating valve 46 are connected in sequence to form a large-dose oil injection channel. The small-dose oil injection channel and the large-dose oil injection channel are arranged in parallel between the oil-gas separator 20 and the rear check valve 60. The small-dose oil injector 33, the small-dose main safety pressure relief valve 34, the small-dose oil injector 35 and the small-dose oil injector 36 are connected between the small-dose switch valve 32 and the small-dose regulating valve 36. A large-dose lubricator 43, a large-dose main safety pressure relief valve 44, and a large-dose secondary safety pressure relief valve 45 are connected between the large-dose secondary safety pressure relief valve 35, the large-dose switch valve 42, and the large-dose regulating valve 46. The other ends of the small-dose lubricator 33 and the large-dose lubricator 43 are respectively connected to the driving device, and the other ends of the small-dose main safety pressure relief valve 34, the small-dose secondary safety pressure relief valve 35, the large-dose main safety pressure relief valve 44, and the large-dose secondary safety pressure relief valve 45 are all connected to the oil leakage collector 50.

[0055] The front on-off valve 10, oil-gas separator 20, small-dose check valve 31, small-dose on-off valve 32, small-dose lubricator 33, small-dose main safety pressure relief valve 34, small-dose secondary safety pressure relief valve 35, small-dose regulating valve 36, oil leakage collector 50, rear check valve 60, fuel flow meter 70, and solenoid valve 80 form a small-dose lubrication system. The front on-off valve 10, oil-gas separator 20, large-dose check valve 41, large-dose on-off valve 42, large-dose lubricator 43, large-dose main safety pressure relief valve 44, large-dose secondary safety pressure relief valve 45, and large-dose regulating valve 46, oil leakage collector 50, rear check valve 60, fuel flow meter 70, and solenoid valve 80 form a large-dose lubrication system.

[0056] The front switch valve 10 is used to adjust the fuel flow rate of the platform fuel source, the oil-gas separator 20 can play the role of oil source supply and exhaust, the small dose check valve 31 and the large dose check valve 41 are used to prevent the fuel in the large and small dose fuel injection channels from flowing back, the small dose switch valve 32 and the large dose switch valve 42 are used to adjust the on-off and flow rate of the fuel flow in the large and small dose fuel injection channels, the small dose oiler 33 and the large dose oiler 43 realize the extraction and injection of fuel in each dose fuel injection channel under the action of the drive device, the small dose main safety pressure relief valve 34 and the large dose main safety pressure relief valve 44 are used to control the fuel pressure in each dose fuel injection channel. The pressure is released after the force exceeds the limit. At the same time, the small-dose secondary safety pressure relief valve 35 and the large-dose secondary safety pressure relief valve 45 are used for emergency pressure relief when the small-dose main safety pressure relief valve 34 and the large-dose main safety pressure relief valve 34 in their respective dosage oil injection channels fail unexpectedly or exceed the working range. The small-dose regulating valve 36 and the large-dose regulating valve 46 are used to adjust the amount of fuel injected into the pipeline. The rear check valve 60 is used to prevent the fuel in the core engine fuel main pipe from flowing back into the various oil injection channels. The fuel flow meter 70 is used to measure the actual amount of fuel flowing into the fuel main pipe. The solenoid valve 80 is used to cut off the fuel flow to the fuel main pipe in an emergency.

[0057] like Figure 2 As shown, the connection position between the external fuel filling system 100 and the core engine fuel main pipe is set between the fuel control system 200 and the core engine combustion chamber 400, and close to the rear side of the fuel supply check valve 300 on one side of the core engine combustion chamber.

[0058] In some embodiments of the present application, the front switch valve 10, the small-dose switch valve 32, and the large-dose switch valve 42 are all electric switch valves.

[0059] In addition, in some embodiments of the present application, the small-dose regulating valve 36 and the large-dose regulating valve 46 are electric regulating valves. Furthermore, the regulating accuracy of the small-dose regulating valve 36 is higher than that of the large-dose regulating valve 46.

[0060] The external fuel filling system 100 provided in this application has four working processes, namely, small-dose fuel extraction, small-dose fuel injection, large-dose fuel extraction, and large-dose fuel injection, wherein:

[0061] 1) Small-dose fuel pumping process

[0062] Before starting oil pumping, the front switch valve 10 and the small-dose switch valve 32 are set to the open state, the small-dose regulating valve 36, the solenoid valve 80, the large-dose switch valve 42, and the large-dose regulating valve 46 are set to the closed state, and the small-dose main safety pressure relief valve 34, the small-dose secondary safety pressure relief valve 35, the large-dose main safety pressure relief valve 44, and the large-dose secondary safety pressure relief valve 45 are also in the closed state because the pressure is far below the working pressure.

[0063] Based on the desired fuel injection volume, the leftward displacement of the piston in the small-dose lubricator 33 is calculated. The piston of the small-dose lubricator 33 is then driven to the left by the drive mechanism. Fuel from the platform fuel source now flows into the pipeline through the front on / off valve 10. Air mixed in the fuel is expelled through the oil-air separator 20 before flowing through the small-dose on / off valve 32 into the rodless chamber of the small-dose lubricator 33. When the desired fuel volume is reached, the drive mechanism stops, and the extracted fuel remains in the rodless chamber of the small-dose lubricator 33. The small-dose check valve 31 effectively prevents fuel in the rodless chamber from flowing back into the platform fuel source.

[0064] 2) Small-dose fuel injection process

[0065] Before starting oil filling, set the front switch valve 10, the small-dose switch valve 32, the large-dose switch valve 42, and the large-dose regulating valve 46 to the closed state, and the small-dose regulating valve 36 and the solenoid valve 80 to the open state. The small-dose main safety pressure relief valve 34, the small-dose secondary safety pressure relief valve 35, the large-dose main safety pressure relief valve 44, and the large-dose secondary safety pressure relief valve 45 are also in the closed position because the pressure is far below the working pressure.

[0066] Based on the desired fuel injection volume and injection time, the rightward movement length and speed of the piston in the small-dose lubricator 33 are calculated. The piston of the small-dose lubricator 33 is then driven to the right by the drive mechanism. At this point, the fuel in the rodless chamber of the small-dose lubricator 33 flows through the small-dose regulating valve 36, the rear check valve 60, the fuel flowmeter 70, and the solenoid valve 80 to the core engine fuel manifold, thereby achieving the small-dose fuel injection function. When the desired injection volume is reached, the drive mechanism stops, and the fuel in the rodless chamber of the small-dose lubricator 33 no longer enters the core engine fuel manifold. If overpressure occurs in the fuel injection line, the small-dose primary safety relief valve 34 opens first to relieve pressure. If the line remains overpressured, the small-dose secondary safety relief valve 35 opens to further relieve pressure, thereby protecting the fuel injection system. When the piston of the small-dose lubricator 33 is moving and stopped, the rear check valve 60 effectively prevents fuel from the core engine fuel manifold from flowing back into the fuel injection line.

[0067] 3) Large-dose fuel pumping process

[0068] Before starting oil pumping, the front switch valve 10 and the large-dose switch valve 42 are set to the open state, the small-dose switch valve 32, the small-dose regulating valve 36, the large-dose regulating valve 46, and the solenoid valve 80 are set to the closed state, and the small-dose main safety pressure relief valve 34, the small-dose secondary safety pressure relief valve 35, the large-dose main safety pressure relief valve 44, and the large-dose secondary safety pressure relief valve 45 are also in the closed state because the pressure is far below the working pressure.

[0069] Based on the desired fuel injection volume, the leftward displacement of the piston in the high-dose lubricator 43 is calculated. The piston of the high-dose lubricator 43 is then driven to the left by the drive mechanism. Fuel from the platform fuel source now flows through the front on / off valve 10 into the pipeline, where it passes through the oil-air separator 20, expelling any air mixed with it. The fuel then flows through the high-dose on / off valve 42 into the rodless chamber of the high-dose lubricator 43. When the desired fuel volume is reached, the drive mechanism stops, and the extracted fuel remains in the rodless chamber of the high-dose lubricator 43. The high-dose check valve 41 effectively prevents fuel in the rodless chamber from flowing back into the platform fuel source.

[0070] 4) High-dose fuel injection process

[0071] Before starting oil filling, set the front switch valve 10, the small-dose switch valve 32, the small-dose regulating valve 36, and the large-dose switch valve 42 to the closed state, and the large-dose regulating valve 46 and the solenoid valve 80 to the open state. The small-dose main safety pressure relief valve 34, the small-dose secondary safety pressure relief valve 35, the large-dose main safety pressure relief valve 44, and the large-dose secondary safety pressure relief valve 45 are also in the closed position because the pressure is far below the working pressure.

[0072] Based on the required fuel injection amount and injection time, the rightward movement length and speed of the piston in the high-dose lubricator 43 are calculated. The piston of the high-dose lubricator 43 is then driven to the right by the drive mechanism. At this point, the fuel in the rodless chamber of the high-dose lubricator 43 flows through the high-dose regulating valve 46, the rear check valve 60, the fuel flow meter 70, and the solenoid valve 80 to the core engine fuel manifold, thereby achieving high-dose fuel injection. When the required fuel injection amount is reached, the drive mechanism stops, and the fuel in the rodless chamber of the high-dose lubricator 43 no longer enters the core engine fuel manifold. If overpressure occurs in the fuel injection line, the high-dose primary safety relief valve 44 opens first to relieve pressure. If the line remains overpressured, the high-dose secondary safety relief valve 45 opens to further relieve pressure, thereby protecting the fuel injection system. When the piston of the high-dose lubricator 43 is moving and stopped, the rear check valve 60 effectively prevents fuel from the core engine fuel manifold from flowing back into the fuel injection line.

[0073] Compared with the core engine fuel supply method in the prior art, the in vitro fuel filling system and filling method provided in this application have the advantages of large fuel quantity adjustment range and flexible regulation, which can well meet the needs of core engine testing and further improve the safety and reliability of core engine testing.

[0074] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An in vitro fuel filling system for core engine testing, characterized in that: The external fuel filling system (100) comprises: a front switch valve (10), an oil-gas separator (20), a small-dose check valve (31), a small-dose switch valve (32), a small-dose oil injector (33), a small-dose main safety pressure relief valve (34), a small-dose secondary safety pressure relief valve (35), a small-dose regulating valve (36), a large-dose check valve (41), a large-dose switch valve (42), a large-dose oil injector (43), a large-dose main safety pressure relief valve (44), a large-dose secondary safety pressure relief valve (45), a large-dose regulating valve (46), an oil leakage collector (50), a rear check valve (60), a fuel flow meter (70), and a solenoid valve (80); The front switch valve (10), the oil-gas separator (20), the rear check valve (60), the fuel flow meter (70) and the solenoid valve (80) are arranged in sequence. The front end of the front switch valve (10) is connected to the platform fuel source, and the end of the solenoid valve (80) is connected to the core engine fuel main pipe. The small-dose check valve (31), the small-dose on-off valve (32) and the small-dose regulating valve (36) are sequentially connected to form a small-dose oil injection channel, the large-dose check valve (41), the large-dose on-off valve (42) and the large-dose regulating valve (46) are sequentially connected to form a large-dose oil injection channel, and the small-dose oil injection channel and the large-dose oil injection channel are arranged in parallel between the oil-gas separator (20) and the rear check valve (60); A small-dose oil injector (33), a small-dose main safety pressure relief valve (34), and a small-dose secondary safety pressure relief valve (35) are connected between the small-dose switch valve (32) and the small-dose regulating valve (36); a large-dose oil injector (43), a large-dose main safety pressure relief valve (44), and a large-dose secondary safety pressure relief valve (45) are connected between the large-dose switch valve (42) and the large-dose regulating valve (46); the other ends of the small-dose oil injector (33) and the large-dose oil injector (43) are respectively connected to a driving device; the other ends of the small-dose main safety pressure relief valve (34), the small-dose secondary safety pressure relief valve (35), the large-dose main safety pressure relief valve (44), and the large-dose secondary safety pressure relief valve (45) are all connected to an oil leakage collector (50).

2. The in vitro fuel filling system for core engine testing as claimed in claim 1, characterized in that: The front switch valve (10), the oil-gas separator (20), the small-dose check valve (31), the small-dose switch valve (32), the small-dose oil injector (33), the small-dose main safety pressure relief valve (34), the small-dose secondary safety pressure relief valve (35), the small-dose regulating valve (36), the oil leakage collector (50), the rear check valve (60), the fuel flow meter (70), and the solenoid valve (80) constitute a small-dose oil injection system; The front switch valve (10), the oil-gas separator (20), the high-dose check valve (41), the high-dose switch valve (42), the high-dose oil injector (43), the high-dose main safety pressure relief valve (44), the high-dose secondary safety pressure relief valve (45), the high-dose regulating valve (46), the oil leakage collector (50), the rear check valve (60), the fuel flow meter (70), and the solenoid valve (80) constitute a high-dose oil injection system.

3. The in vitro fuel filling system for core engine testing according to claim 1, characterized in that: The front switch valve (10), the small-dose switch valve (32), and the large-dose switch valve (42) are all electric switch valves.

4. The in vitro fuel filling system for core engine testing according to claim 1, characterized in that: The small-dose regulating valve (36) and the large-dose regulating valve (46) are electric regulating valves.

5. The in vitro fuel filling system for core engine testing according to claim 4, characterized in that: The regulation accuracy of the small-dose switch valve (32) is higher than the regulation accuracy of the large-dose switch valve (42).

6. The in vitro fuel filling system for core engine testing according to claim 1, characterized in that: The connection position between the external fuel filling system (100) and the core engine fuel main pipe is arranged between the fuel control system (200) and the core engine combustion chamber (400) and close to the rear end of the fuel supply check valve (300) on one side of the core engine combustion chamber.

7. An in vitro fuel filling method for core engine testing, characterized in that: The in vitro fuel filling system for core engine testing according to any one of claims 1 to 6 is used, wherein the in vitro fuel filling method includes small-dose fuel extraction, small-dose fuel injection, large-dose fuel extraction, and large-dose fuel injection, wherein: The small-dose fuel pumping process is as follows: before starting the pumping, the front switch valve (10) and the small-dose switch valve (32) are set to the open state, the small-dose regulating valve (36), the solenoid valve (80), the large-dose switch valve (42), and the large-dose regulating valve (46) are set to the closed state, and the small-dose main safety pressure relief valve (34), the small-dose secondary safety pressure relief valve (35), the large-dose main safety pressure relief valve (44), and the large-dose secondary safety pressure relief valve (45) are in the closed state; the small-dose fuel injection amount is calculated according to the required fuel injection amount. The piston of the small-dose oil injector (33) moves to the left by the length of the left movement of the piston, and then the piston of the small-dose oil injector (33) is driven to move to the left by the driving device. At this time, the fuel in the platform fuel source flows into the pipeline through the front switch valve (10), and the air mixed in the fuel is discharged when passing through the oil-gas separator (20). The fuel flows into the rodless cavity of the small-dose oil injector (33) through the small-dose switch valve (32). When the required amount of fuel is reached, the driving device stops and the extracted fuel is stored in the rodless cavity of the small-dose oil injector (33), completing the small-dose fuel extraction; The small-dose fuel injection process is as follows: before starting the injection, the front switch valve (10), the small-dose switch valve (32), the large-dose switch valve (42), and the large-dose regulating valve (46) are set to a closed state, the small-dose regulating valve (36) and the solenoid valve (80) are set to an open state, and the small-dose main safety pressure relief valve (34), the small-dose secondary safety pressure relief valve (35), the large-dose main safety pressure relief valve (44), and the large-dose secondary safety pressure relief valve (45) are in a closed position; according to the required fuel injection amount and injection time, the rightward movement length and movement speed of the piston in the small-dose fuel injector (33) are calculated, and then the piston of the small-dose fuel injector (33) is driven to move to the right by the driving device. At this time, the fuel stored in the rodless chamber of the small-dose fuel injector (33) will flow to the core engine fuel main pipe through the small-dose regulating valve (36), the rear check valve (60), the fuel flow meter (70), and the solenoid valve (80), thereby realizing the small-dose fuel injection; The large-dose fuel pumping process is as follows: before starting the pumping, the front switch valve (10) and the large-dose switch valve (42) are set to the open state, the small-dose switch valve (32), the small-dose regulating valve (36), the large-dose regulating valve (46), and the solenoid valve (80) are set to the closed state, and the small-dose main safety pressure relief valve (34), the small-dose secondary safety pressure relief valve (35), the large-dose main safety pressure relief valve (44), and the large-dose secondary safety pressure relief valve (45) are in the closed state; the large-dose fuel injection amount is calculated according to the required fuel injection amount. The piston of the large-dose oil injector (43) moves to the left by the length of the left movement, and then the piston of the large-dose oil injector (43) is driven to move to the left by the driving device. At this time, the fuel in the platform fuel source flows into the pipeline through the front switch valve (10), and the air mixed in the fuel is discharged when passing through the oil-gas separator (20). The fuel flows into the rodless cavity of the large-dose oil injector (43) through the large-dose switch valve (42). When the required amount of fuel is reached, the driving device stops and the extracted fuel is stored in the rodless cavity of the large-dose oil injector (43), completing the large-dose fuel extraction; The high-dose fuel injection process is as follows: before the injection begins, the front switch valve (10), the low-dose switch valve (32), the low-dose regulating valve (36), and the high-dose switch valve (42) are set to a closed state, the high-dose regulating valve (46) and the solenoid valve (80) are set to an open state, and the low-dose main safety pressure relief valve (34), the low-dose secondary safety pressure relief valve (35), the high-dose main safety pressure relief valve (44), and the high-dose secondary safety pressure relief valve (45) are in a closed position; according to the required fuel injection amount and injection time, the rightward movement length and movement speed of the piston in the high-dose fuel injector (43) are calculated, and then the piston of the high-dose fuel injector (43) is driven to move to the right by the driving device. At this time, the fuel stored in the rodless chamber of the high-dose fuel injector (43) will flow to the core engine fuel main pipe through the high-dose regulating valve (46), the rear check valve (60), the fuel flow meter (70), and the solenoid valve (80), thereby realizing high-dose fuel injection.

8. The in vitro fuel filling method for core engine testing according to claim 7, characterized in that: During the small-dose fuel pumping process, the small-dose check valve (31) is used to effectively prevent the fuel in the rodless chamber from flowing back into the platform fuel source; During the large-dose fuel pumping process, the large-dose check valve (41) is used to effectively prevent the fuel in the rodless chamber from flowing back into the platform fuel source.

9. The in vitro fuel filling method for core engine testing according to claim 7, characterized in that: During the small-dose fuel injection process, when the required injection amount is reached, the driving device stops operating, and the fuel stored in the rodless cavity of the small-dose fuel injector (33) will no longer enter the core engine fuel main pipe; When overpressure occurs in the oil injection pipeline, the small-dose main safety pressure relief valve (34) opens first to relieve pressure. If the pipeline is still in an overpressure state, the small-dose secondary safety pressure relief valve (35) opens to further relieve pressure, thereby protecting the safety of the oil injection system. When the piston of the small-dose oil injector (33) is in a moving and stopped state, the rear check valve (60) is used to prevent the fuel in the core engine fuel main pipe from flowing back into the oil injection pipeline.

10. The in vitro fuel filling method for core engine testing according to claim 7, characterized in that: During the large-dose fuel injection process, when the required injection amount is reached, the driving device stops operating, and the fuel stored in the rodless cavity of the large-dose fuel injector (43) will no longer enter the core engine fuel main pipe; When overpressure occurs in the oil injection pipeline, the large-dose main safety relief valve (44) opens first to relieve pressure. If the pipeline is still in an overpressure state, the large-dose secondary safety relief valve (45) opens to further relieve pressure, thereby protecting the safety of the oil injection system. When the piston of the high-dose oil injector (43) is in a moving and stopped state, the rear check valve (60) is used to effectively prevent the fuel in the core engine fuel main pipe from flowing back into the oil injection pipeline.

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