Liquid flow test system for combustion device

Abstract

The invention discloses a combustion device liquid flow test system, solves the problem that a conventional liquid flow test of a combustion device cannot be carried out in a back pressure cabin, and belongs to the technical field of liquid rocket engines. Comprising a water tank, a water pump, a valve, a flowmeter, a pressure sensor, a combustion device and a throttling device, water in the water tank is pumped out through the water pump and conveyed to an oxidizing agent head cavity or a fuel head cavity of the combustion device through the valve and the flowmeter, the water flows into the nozzle after passing through the oxidizing agent head cavity or the fuel head cavity and is sprayed into a combustion chamber of the combustion device, and the throttling device is connected to an outlet of the combustion device, so that the combustion chamber is filled with water. A certain backpressure environment is formed in the combustion chamber according to the size of the throttling hole diameter of the throttling device, and the pressure, measured by the pressure sensor, in the combustion chamber is P2; finally, the water flows through the throttling device and then is discharged into atmosphere. The real performance parameters of the combustion device can be obtained without a complex back pressure cabin system, the test system can be simplified, and operation is convenient.

Description

Technical Field

[0001] This invention relates to a liquid flow test system for a combustion device, belonging to the field of liquid rocket engine technology. Background Technology

[0002] After the combustion device of a liquid rocket engine is manufactured, a liquid flow test is usually conducted to obtain the performance parameters of the combustion device and to determine whether these parameters meet the design requirements. Currently, liquid flow tests are generally conducted in a non-backpressure environment using room temperature water. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, solve the problem that conventional liquid flow tests of combustion devices cannot be carried out in the anti-pressure chamber, and provide a liquid flow test system that does not require an anti-pressure chamber, while still obtaining the performance parameters of the combustion device.

[0004] The objective of this invention is achieved through the following technical solutions:

[0005] A liquid flow test system for a combustion device includes a water tank, a water pump, valves, a flow meter, a pressure sensor, a combustion device, and a throttling device;

[0006] Water is pumped from the tank through a water pump, flows through valves and a flow meter to the oxidizer head chamber or fuel head chamber of the combustion device, and then flows into the nozzle and is injected into the combustion chamber of the combustion device. A throttling device is connected to the outlet of the combustion device to fill the combustion chamber with water. Depending on the size of the throttling orifice of the throttling device, a certain back pressure environment is formed in the combustion chamber. The pressure in the combustion chamber measured by the pressure sensor is P2. Finally, the water flows through the throttling device and is discharged into the atmosphere.

[0007] In one embodiment of the present invention, the pressure in the oxidizer head chamber or fuel head chamber is P1, and the pressure rising in the combustion chamber is P2, satisfying the following conditions:

[0008] In one embodiment of the present invention, by adjusting the equivalent diameter of the throttling element, the following is achieved:

[0009] In one embodiment of the present invention, the throttling equivalent diameter D of the throttling device t The following relationship must be satisfied:

[0010] The combustion device contains n nozzles, the equivalent diameter of the nozzle orifice is D1, and the equivalent diameter of the throttling device is D. t The throttling equivalent diameter of the combustion chamber of the combustion device is D2.

[0011] In one embodiment of the present invention, the throttling device is a throttling orifice plate, a cavitation pipe, or a regulating valve.

[0012] In one embodiment of the present invention, the throttling device and the combustion device are connected by a flange and sealed with a fluoropolymer four-ring seal.

[0013] In one embodiment of the present invention, when conducting a nozzle performance test of the oxidizer head chamber, it is necessary to seal the inlet flange of the fuel head chamber to prevent water from flowing out of the inlet flange of the fuel head chamber; when conducting a nozzle performance test of the fuel head chamber, it is necessary to seal the inlet flange of the oxidizer head chamber to prevent water from flowing out of the inlet flange of the oxidizer head chamber.

[0014] In one embodiment of the present invention, when there are more than two combustion chambers, the inlet flanges of the remaining untested nozzles must be sealed to ensure that a back pressure environment can be formed.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) The present invention does not require a complex anti-pressure chamber system to obtain the true performance parameters of the combustion device, which can simplify the test system and facilitate operation.

[0017] (2) This test system connects a throttling element to the downstream pipeline of the combustion device outlet, uses a flange connection, and is sealed with a fluoropolymer four-ring seal. It has a simple structure, good sealing performance, and is easy to operate.

[0018] (3) The throttling element in this test system can be used as part of the test fixture and can be reused, ensuring the consistency of the throttling element state in each test, which facilitates the analysis and comparison of product performance data.

[0019] (4) This test system is applicable to different pressure and flow environment conditions and has good system reliability.

[0020] (5) This invention can be used for thrust chamber or gas generator liquid flow test. It has been tested and verified by dozens of thermal tests, and the technology is feasible. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the principle of liquid flow test.

[0022] Figure 2 This is a schematic diagram of the pressure measuring points and throat dimensions of the combustion device.

[0023] Figure 3a This is a schematic diagram of a throttling orifice plate.

[0024] Figure 3b This is a schematic diagram of a cavitation tube structure.

[0025] Reference numerals in the attached drawings: 1-Water tank; 2-Water pump; 3-Valve; 4-Flow meter; 5-Pressure sensor; 6-Combustion device; 7-Throttling device (throttling orifice plate, cavitation pipe, regulating valve, etc.); 8-Oxidizer head chamber; 9-Fuel head chamber; 10-Combustion chamber. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0027] A liquid flow test system for a combustion device includes a water tank 1, a water pump 2, a valve 3, a flow meter 4, a pressure sensor 5, a combustion device 6, and a throttling device 7, such as... Figure 1 As shown.

[0028] Water is pumped out of water tank 1 by water pump 2, flows through valve 3 and flow meter 4, and is delivered at a certain flow rate to the oxidizer head chamber 8 or fuel head chamber 9 of combustion device 6. After entering the head chamber of combustion device 6, the water flows into the nozzle and is sprayed into the combustion chamber 10 of combustion device 6. Figure 2 As shown, since the throttling device 7 is connected to the outlet of the combustion device 6, the combustion chamber 10 is filled with water. According to the size of the throttling orifice of the throttling device 7, a certain back pressure environment is formed in the combustion chamber 10. The pressure in the combustion chamber 10 measured by the pressure sensor 5 is P2. Finally, the water flows through the throttling device 7 and is discharged into the atmosphere.

[0029] The pressure in the oxidizer head chamber 8 or fuel head chamber 9 is P1, and the pressure rising in the combustion chamber 10 is P2. The magnitude of the pressure rising in the combustion chamber affects the accuracy of the combustion device's performance parameters. This can be achieved by adjusting the equivalent diameter of the throttling element 7 to meet certain requirements. At that time, the measured flow coefficient was in good agreement with the hot test results.

[0030] Throttling devices 7, such as orifice plates, cavitation pipes, or regulating valves, can be installed at the outlet of the combustion device 6 and connected to the outlet flange of the combustion device 6, and sealed with fluoropolymer rings. Figure 3a This is a schematic diagram of the orifice plate structure. Figure 3b This is a schematic diagram of a cavitation tube structure.

[0031] The throttling equivalent diameter D of the throttling device 7 t The following relationship must be satisfied:

[0032] The combustion device 6 contains n nozzles, the equivalent diameter of the nozzle throttling orifice is D1, and the throttling device 7 has an equivalent diameter of D. t The throttling equivalent diameter of the combustion chamber of combustion device 6 is D2.

[0033] Combustion device 6 typically has two chambers: an oxidizer chamber 8 and a fuel chamber 9. When testing the nozzle performance of the oxidizer chamber 8, the inlet flange of the fuel chamber 9 must be sealed to prevent water from flowing out and creating back pressure. Similarly, when testing the nozzle performance of the fuel chamber 9, the inlet flange of the oxidizer chamber 8 must be sealed to prevent water from flowing out and creating back pressure. When combustion device 6 has more than two chambers, the procedure is the same, but the inlet flanges of the chambers corresponding to the nozzles not being tested must be sealed to ensure a back pressure environment is created.

[0034] The contents not described in detail in this specification are common knowledge to those skilled in the art.

[0035] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A combustion device liquid stream test system, characterized by, The water tank (1), water pump (2), valve (3), flow meter (4), pressure sensor (5), combustion device (6), throttling device (7); The water in the water tank (1) is pumped out by the water pump (2), flows through the valve (3) and the flow meter (4), and is delivered to the oxidant head cavity (8) or the fuel head cavity (9) of the combustion device (6). After the water passes through the oxidant head cavity (8) or the fuel head cavity (9), it flows into the nozzle and is injected into the combustion chamber (10) of the combustion device (6). The throttling device (7) is connected to the outlet of the combustion device (6), so that the combustion chamber (10) is filled with water. According to the size of the throttling hole diameter of the throttling device (7), a certain back pressure environment is formed in the combustion chamber (10). The pressure in the combustion chamber (10) measured by the pressure sensor (5) is P2. Finally, the water flows through the throttling device (7) and is discharged into the atmosphere.

2. The combustion device flow test system of claim 1, wherein The pressure in the oxidizer head cavity (8) or fuel head cavity (9) is P1, and the pressure built up in the combustion chamber (1) (0) is P2, satisfying 3. The combustion device flow test system of claim 2, wherein By adjusting the size of the equivalent diameter of the throttling element (7), it is made sure that 4. The combustion device flow test system of claim 3, wherein The throttle equivalent diameter D of the throttle device (7) t The following relationship must be satisfied: wherein the number of nozzles in the combustion device (6) is n, the equivalent diameter of the orifice of the nozzles is D1, the equivalent diameter of the throttle of the throttle device (7) is D t , and the equivalent diameter of the combustion chamber of the combustion device (6) is D2.

5. The combustion device fluid flow test system of claim 1, wherein, The throttling device (7) uses a throttling orifice plate, a cavitation tube or a regulating valve.

6. The combustion device fluid flow test system of claim 1, wherein, The throttling device (7) is connected to the combustion device (6) through a flange and is sealed with a fluorine four sealing ring.

7. The combustion device fluid flow test system of claim 1, wherein When performing nozzle performance test of the oxidant head cavity (8), the inlet flange of the fuel head cavity (9) needs to be blocked to prevent water from flowing out of the inlet flange of the fuel head cavity. When performing nozzle performance test of the fuel head cavity (9), the inlet flange of the oxidant head cavity (8) needs to be blocked to prevent water from flowing out of the inlet flange of the oxidant head cavity (8).

8. The combustion device fluid flow test system of claim 1, wherein, When the combustion device (6) has more than two head cavities, the inlet flanges of the head cavities corresponding to the nozzles not to be tested need to be blocked to ensure that a back pressure environment can be formed.

Images