Fuel system for nozzle and fuel main tester

Abstract

The present invention proposes a fuel system for a nozzle and fuel main tester, comprising a plurality of oil circuits connected to the same fuel tank, each oil circuit being provided with a proportional flow valve and a variable frequency motor; a fuel heating and cooling device being provided at the oil outlet end of the plurality of oil circuits; the fuel heating and cooling device being connected to an oil storage type heat exchanger; one side of the oil outlet end of the plurality of oil circuits being connected to a plurality of test benches, and the other side being connected to an oil storage type heat exchanger; the present invention can meet the requirements of the fuel main test and the nozzle test for different temperatures and flow rates, while the fuel temperature can be quickly adjusted to the index temperature, with short preparation time, fast response speed and low energy consumption; and it shortens the transportation path of high and low temperature fuels, reduces the requirements of other fuel supply components in the oil circuit for high and low temperature working conditions, improves their service life and reliability, and can also effectively reduce the amount of ice crystals generated in the low temperature oil and reduce the risk of oil filter clogging.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation engine testing, and in particular to a fuel system for a nozzle and fuel main pipe tester. Background Art

[0002] The performance of aircraft engine nozzles and fuel manifolds is closely linked to engine combustion conditions, directly impacting engine power performance. Therefore, comprehensive performance testing of nozzles and fuel manifolds is essential during the manufacturing process. Currently, these tests primarily include fuel manifold flow rate testing, flow distribution testing, single-nozzle flow rate testing, single-nozzle spray cone angle testing, circumferential spray nonuniformity testing, atomization characteristics testing, and atomization characteristics testing under air mixing conditions. These tests typically require multiple test platforms, necessitating the design of separate fuel supply systems for each test platform. Different tests require different fuel temperature requirements, with some requiring similar fuel temperatures. Each independent fuel system requires heating or cooling the fuel in the tank from its initial temperature during testing, significantly increasing the response and preparation time of the fuel system and increasing energy consumption. Furthermore, the prolonged supply of low or high temperature fuel can impact the life of the entire fuel system. Summary of the Invention

[0003] In response to the above-mentioned problems existing in the prior art, the present invention proposes a fuel system for a fuel nozzle and fuel manifold tester. The present invention specifically adopts the following technical solutions:

[0004] A fuel system for a nozzle and fuel manifold tester is characterized in that it includes multiple oil circuits connected to the same fuel tank, each oil circuit is provided with a proportional flow valve and a variable frequency motor; a fuel heating and cooling device is provided at the oil outlet end of the multiple oil circuits; the fuel heating and cooling device is connected to an oil storage type heat exchanger; one side of the oil outlet end of the multiple oil circuits is connected to multiple test benches, and the other side is connected to the oil storage type heat exchanger.

[0005] Furthermore, the test bench includes a flow test bench, a performance test bench, and an air mixing test bench; and each of the oil circuits is connected to the same test bench or each oil circuit is connected to a separate test bench.

[0006] Furthermore, the heating part of the fuel heating and cooling device adopts an electric heating method, and the cooling part adopts a compressor cooling method.

[0007] Furthermore, the oil circuit is provided with a two-stage filtering device, including a high-pressure pipeline filter and a low-pressure pipeline filter.

[0008] Furthermore, a pressure measuring device is provided in front of the proportional control valve.

[0009] Furthermore, a mass flow meter is provided after the proportional control valve.

[0010] Furthermore, the fuel system is also provided with an oil return pipeline connected to the test bench; an oil return tank and a waste oil tank are connected in parallel on the oil return pipeline.

[0011] Furthermore, a liquid level sensor and a fuel replenishing pipeline are provided in the fuel tank.

[0012] Furthermore, the fuel tank is connected to an industrial oil cooling box; an oil drain valve is provided at the bottom of the fuel tank, and an air filter is provided at the top.

[0013] The beneficial effects of the present invention are as follows:

[0014] (1) The present invention is provided with a fuel heating and cooling device with an oil storage heat exchanger, and multiple oil circuits are designed to meet the different temperature requirements of the fuel main test and the nozzle test. At the same time, the fuel temperature can be quickly adjusted to the index temperature, with short preparation time, fast response speed, and low energy consumption; and the transportation path of high and low temperature fuel is shortened, and the requirements of other fuel supply components in the oil circuit for high and low temperature working conditions are reduced, thereby improving their service life and reliability. It can also effectively reduce the amount of ice crystals generated in low-temperature oil and reduce the risk of oil filter clogging.

[0015] (2) The present invention is provided with a series of components such as a proportional flow valve, a variable frequency motor, an accumulator, and an air valve, which can quickly adjust and stabilize the pressure in the oil circuit; a branch is provided on the return oil circuit to arrange a waste oil tank, which can classify and collect waste oil that is not suitable for reuse after low-temperature and high-temperature tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the fuel system principle proposed by the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", etc., indicating positions or positional relationships, are based on the positions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0018] As shown in the figure, the present invention proposes a fuel system for a nozzle and fuel manifold tester. The system includes three oil supply circuits, namely oil circuit 1, oil circuit 2, and oil circuit 3. The three oil circuits are connected to the same fuel tank, which is connected to an industrial oil cooler 9. The temperature of the fuel therein is automatically controlled by the industrial oil cooler 9 within a control range of 15-30°C, which can meet ordinary testing requirements. In this embodiment, the fuel tank has a designed capacity of 2000L and is made of stainless steel. The bottom has a certain inclination and is provided with a drain valve, and an air filter is provided on the top. The fuel system has an open structure, and the fuel pressure and temperature can be adjusted. A liquid level sensor is provided in the fuel tank to remind you to add fuel when the tank liquid level is lower than the required level. In this embodiment, the fuel is connected to the fuel tank through a solenoid valve from the oil depot pipeline. When the liquid level falls below a certain value, the fuel can be added manually or automatically.

[0019] After the fuel in the fuel tank is filtered by the air filter, it is sent to the oil circuit 1, 2, and 3 through the fuel pump. The three oil circuits are equipped with a proportional flow valve 5 controlled by a variable frequency motor 8, which can automatically adjust the pressure in the oil circuit. After the pressure is set before the test, the system can quickly adjust and stabilize the pressure. Therefore, the present invention is equipped with a pressure measuring device 6 in the front section of the proportional flow valve 5 in the oil circuit to monitor the real-time pressure in the oil circuit, and can feedback the pressure information for the PLC to control the variable frequency motor, so as to change the opening of the proportional flow valve 5 in real time and stabilize the pressure in the system. A safety valve 7 and an accumulator are provided to ensure normal pressure in the system; a mass flowmeter 4 is provided after the proportional flow valve to monitor the mass flow of fuel output from each oil circuit; the present invention also provides a two-stage filtering device, a high-pressure pipeline filter and a low-pressure pipeline filter, before and after the proportional flow valve, respectively. The high-pressure pipeline filter has an accuracy of 5μm, and the low-pressure pipeline filter has an accuracy of 80μm. A stainless steel filter element is used to ensure that no detached material clogs the nozzle, which can effectively control pollution of the fuel system, increase the service life of key components and the entire fuel system, and ensure operational reliability.

[0020] The oil outlet of each oil circuit is connected to each test bench, wherein oil circuit 2 is provided with two branches, one of which is connected to the same flow test platform 14 for the main tester with oil circuit 1 to supply oil thereto; and the other branch of oil circuit 2 is connected to the same fuel heating and cooling device 12 with oil circuit 3 3, in which an oil storage heat exchanger 17 is provided. The container of the oil storage heat exchanger is 400L, and the heating part of the fuel heating and cooling device adopts an electric heating scheme, and the cooling part adopts a compressor refrigeration scheme, and the oil temperature is made uniform by electromagnetic stirring. The design temperature range of the oil storage heat exchanger is -45 to 145°C; the fuel in oil circuit 2 and oil circuit 3 undergoes heat exchange in the oil storage heat exchanger, which can make the fuel The oil temperature is rapidly raised or lowered to the desired temperature, and then the fuel is fed into a number of different nozzle test platforms, such as the performance test platform 15, the flow test platform 16, and the air mixing test platform 13. Each of the above test platforms is connected to the same return oil pipeline, which is equipped with a return oil tank 10 and a waste oil tank 11 in parallel. The return oil tank 10 is connected to the fuel tank, and the waste oil tank is set separately. The main reason is that during low-temperature tests, a large amount of moisture in the air condenses into liquid or solid water and enters the fuel. At this time, this fuel should not be returned to the fuel tank. During high-temperature tests, the properties of aviation kerosene change to a certain extent at high temperatures, mainly causing changes in viscosity, and it is not suitable for reuse. Therefore, the waste oil tank is designed to collect the return oil from high and low temperature tests.

[0021] Based on the structure described above, the working mode of the fuel system proposed in the present invention has the following advantages: oil circuit 1 serves as the main oil circuit for the fuel manifold flow test, oil circuit 2 serves as the auxiliary oil circuit for the manifold test or the main oil circuit for the nozzle test, and oil circuit 3 serves as the auxiliary oil circuit for the nozzle test; the oil temperature in oil circuit 1 is the same as the oil temperature in the fuel tank, which meets the requirements of ordinary tests; and the fuel in oil circuit 2 and oil circuit 3 can be quickly heated or cooled to the index temperature after heat exchange through the oil storage heat exchanger, with short preparation time and rapid response; when conducting tests with similar index temperatures of the required fuel at the same time, the rated temperature of the oil storage heat exchanger can be slightly adjusted to quickly heat or cool to the index temperature, with small temperature loss and low energy loss; and the oil storage heat exchanger is arranged at the oil outlet end of oil circuit 2 and oil circuit 3, and most of the oil supply components in oil circuit 2 and oil circuit 3 transport fuel at room temperature, and do not transport high or low temperature fuel, thereby improving service life and reliability; and reducing the transportation length of the low-temperature oil can reduce the amount of ice crystals generated in the low-temperature oil and reduce the risk of oil filter clogging.

[0022] Obviously, the above examples are merely examples for the purpose of clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A fuel system for a nozzle and fuel manifold tester, characterized in that: It includes three oil circuits, namely oil circuit one, oil circuit two and oil circuit three; the oil outlet ends of the three oil circuits are connected to various test benches, and the three oil circuits are connected to the same fuel tank. Each oil circuit is provided with a proportional flow valve and a variable frequency motor; the oil circuit two is provided with two branches, one of which is connected to the same flow test platform for the main pipe tester as the oil circuit one to supply oil to it; and the other branch of the oil circuit two is connected to the same fuel heating and cooling device as the oil circuit three. The heating and cooling device is provided with an oil storage heat exchanger. The fuel in the oil circuit two and the oil circuit three undergoes heat exchange in the oil storage heat exchanger, which can quickly increase or decrease the fuel temperature to the required temperature, and then the fuel is sent to multiple different nozzle test platforms; the fuel system is also provided with a return oil pipeline connected to the test bench; a return oil tank and a waste oil tank are connected in parallel on the return oil pipeline.

2. The fuel system according to claim 1, characterized in that: The test bench includes a flow test bench, a performance test bench, and an air mixing test bench; two oil circuits in the oil circuits are connected to the same test bench or each oil circuit is connected to a separate test bench.

3. The fuel system according to claim 1, characterized in that: The heating part of the fuel heating and cooling device adopts an electric heating method, and the cooling part adopts a compressor refrigeration method.

4. The fuel system according to claim 1, characterized in that: The oil line is provided with a two-stage filtering device, including a high-pressure pipeline filter and a low-pressure pipeline filter.

5. The fuel system according to claim 1, characterized in that: A pressure measuring device is provided in front of the proportional control valve.

6. The fuel system according to claim 1, characterized in that: A mass flow meter is provided after the proportional control valve.

7. The fuel system according to claim 1, characterized in that: A liquid level sensor and an oil replenishing pipeline are arranged in the fuel tank.

8. The fuel system according to claim 1, characterized in that: The fuel tank is connected to an industrial oil cooling box; an oil drain valve is provided at the bottom of the fuel tank and an air filter is provided at the top.

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