High-temperature hydrogen-rich fuel gas flow equalizing device

Abstract

The invention relates to a high-temperature hydrogen-rich fuel gas flow equalizing device which comprises a head part, an S-shaped body part, a tee joint and a grid, the S-shaped body part comprises a cylindrical section and an S-shaped corner section which are integrally processed, the grating 4 is mounted at the bottom end of the cylindrical section, the upper part of the cylindrical section is connected with the head part, and the bottom end of the S-shaped corner section is connected with the tee inlet; the grid is of a concave arc-shaped structure, the tee joint is provided with a variable cross-section flow channel, and a lateral outlet is of a conical structure. Uniform fuel gas temperature can be obtained, the structural design can effectively improve the temperature uniformity of the pre-combustion chamber, combustion gas can be fully mixed before entering the downstream, and it is guaranteed that downstream assemblies work stably.

Description

Technical Field

[0001] The invention belongs to the field of combustion technology and relates to a high-temperature hydrogen-rich fuel gas flow equalization device. Background Art

[0002] High-temperature hydrogen-rich gas is widely used in the field of liquid rocket engines. It can be used as fuel for the thrust chamber of the regenerative cycle engine and can also drive the turbine assembly. It is generally produced by a precombustion chamber or a gas generator. This device that can produce high-temperature hydrogen-rich gas is widely used in aerospace, ignition, combustion and other technical fields. The uniformity of the generated gas, especially the temperature uniformity, directly affects the combustion of the engine thrust chamber. The existing precombustion chamber or gas generator is mainly a cylindrical combustion chamber structure. This structural design is not conducive to the full mixing of the combustion gas before entering the downstream, resulting in poor uniformity of the gas temperature. In severe cases, it will affect the working stability of the downstream components. Summary of the invention

[0003] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a high-temperature hydrogen-rich fuel gas flow equalization device.

[0004] The solution of the present invention is:

[0005] A high-temperature hydrogen-rich gas flow equalization device, comprising a head, an S-shaped body, a tee, and a grille;

[0006] The S-shaped body includes an integrally processed cylindrical section and an S-shaped corner section, the grille is installed at the bottom end of the cylindrical section, the upper part of the cylindrical section is connected to the head, and the bottom end of the S-shaped corner section is connected to the tee inlet; the tee is designed with a variable cross-section flow channel, and the side outlet is a conical structure. The ratio d1 / d0 of the diameter d1 of each grille hole to the diameter d0 of the cylindrical section is 0.05 to 0.1; the ratio L / R of the length L of the cylindrical section to the corner radius R of the S-shaped corner section is 0.9 to 1.2.

[0007] Preferably, the tee side outlet cone angle θ is less than 10°.

[0008] Preferably, the three-way variable cross-section flow channel increases the flow channel area at the corners.

[0009] Preferably, except for the head, the other parts contacting the gas are made of high-temperature alloy materials with high strength and high temperature resistance.

[0010] Preferably, the grille is a concave arc-shaped structure.

[0011] Preferably, during operation, the oxidant and fuel enter the head and burn, and the combustion products enter the cylindrical section of the S-shaped body, are disturbed by the grille, turn at the S-shaped corner section of the S-shaped body, and finally enter the downstream component through the tee.

[0012] The beneficial effects of the present invention compared with the prior art are:

[0013] Based on the single cylindrical structure of the previous combustion chamber, the present invention adds an S-shaped body structure, a grid structure and a three-way structure to allow the gas to be fully mixed, and a variable cross-section flow channel structure is designed in the three-way to allow the gas to flow out evenly, thereby improving the uniformity of the outlet temperature. The test results show that the S-shaped body, grid, and three-way structure can obtain a uniform gas temperature, which is a structural design that can effectively improve the temperature uniformity of the pre-combustion chamber, facilitate the combustion gas to be fully mixed before entering the downstream, and ensure the stable operation of the downstream components. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the S-shaped body;

[0016] Figure 3 is a schematic diagram of the grid;

[0017] Figure 4 This is a three-way schematic diagram. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] The combustion chamber of the present invention adopts an S-shaped structure, a grille is added at the end of the cylindrical section of the combustion chamber body, and a variable cross-section tee structure is adopted after the cylindrical section. This structural design can make the gas flow through the grille turbulence, the S-shaped body structure turn, and fully mix in the tee cavity before diversion, and finally divert through the variable cross-section flow channel design, eliminating the local low-pressure area caused by diversion, so that the gas flows out evenly and improves the uniformity of gas temperature.

[0020] like Figure 1 As shown, the high-temperature hydrogen-rich gas flow equalization device designed by the present invention comprises a head 1, an S-shaped body 2, a tee 3, and a grille 4. The S-shaped body comprises an integrally processed cylindrical section and an S-shaped corner section, the grille 4 is installed at the bottom end of the cylindrical section, the upper part of the cylindrical section is connected to the head, and the bottom end of the S-shaped corner section is connected to the tee inlet; the grille is a concave arc structure, the tee is designed with a variable cross-section flow channel, and the side outlet is a conical structure.

[0021] During operation, the oxidant and fuel enter the head 1 and burn, and the combustion products enter the cylindrical section of the S-shaped body 2, are disturbed by the grille 4, turn in the S-shaped body 2, and finally pass through the tee 3 to enter the downstream components.

[0022] The structure of the S-shaped body 2 is as follows Figure 2As shown. There is a proportional relationship between the length L of the cylindrical section and the radius R of the S-shaped corner. The smaller the L / R, the larger the S-shaped body angle, the slower the gas turns, which is not conducive to gas mixing; the larger the L / R, the smaller the S-shaped body angle, the sharper the gas turns, which is conducive to gas mixing, but too sharp a turn will cause too much flow resistance loss, and aggravate the scouring of the gas on the wall, affecting the safety of the structure. Therefore, the L / R value range is 0.9 to 1.2.

[0023] Grid structure Figure 3 As shown. The structural design of the grid can disturb the mainstream gas in the center of the combustion chamber, "break up" the mainstream gas, and help the mixing of the gas. After the gas passes through the grid disturbance, it needs to pass through the S-shaped body and the tee before entering the downstream components. This design can ensure that the gas can be fully burned and mixed, thereby ensuring the uniformity of the gas temperature at the generator outlet.

[0024] At the same time, there is a proportional relationship between the grille hole diameter d1 and the cylindrical section diameter d0. The larger d1 / d0 is, that is, the larger the grille hole diameter d1 is, the worse the turbulence effect of the grille structure is. However, if the grille hole diameter d1 is too small, it will increase the gas flow resistance, increase the impact of the gas on the grille structure, and affect the safety of the grille structure. Therefore, the value range of d1 / d0 is 0.05 to 0.1.

[0025] Three-way structure Figure 4 As shown. The side outlet adopts a variable cross-section flow channel design. Compared with the traditional three-way pipeline structure, the variable cross-section flow channel design can make the gas flow closer to the three-way wall, so that the gas can be evenly diverted and diverted along the inner surface of the three-way, avoiding the local low-pressure area at the corner, so that the gas can flow out evenly, thereby ensuring the uniformity of the gas temperature. The traditional three-way pipeline structure is prone to produce local low-pressure areas at the corners, which in turn leads to local fluid reflux, resulting in a large flow resistance, and at the same time causing local gas total temperature changes, affecting the uniformity of gas temperature. Therefore, the flow channel area at the corner is increased during the design, and the local low-pressure area is eliminated through flow simulation calculation and combined with the side outlet cone angle. Among them, the cone angle θ of the side outlet of the three-way is less than 10°. Although the sudden expansion of the gas flow channel is conducive to gas mixing, an excessively large cone angle θ is likely to cause a reflux area near the wall, destroying the uniformity of gas flow.

[0026] Except for the head, the other parts of the device of the present invention that contact the gas are made of high-strength and high-temperature resistant high-temperature alloy materials. At a temperature of 650°C, the strength can still reach more than 1100MPa to adapt to the high temperature and high pressure thermal stress environment of the internal gas.

[0027] The present invention aims to solve the problem of uniform flow of high-temperature hydrogen-rich gas, thereby solving the problem caused by uneven temperature of hydrogen-rich gas. By improving the structure of the combustion chamber of the pre-combustion chamber or the gas generator, the gas flow is uniform, thereby improving the temperature uniformity of the outlet gas. To this end, the combustion chamber adopts an S-shaped body, a grid is added at the end of the cylindrical section of the combustion chamber body, and a variable cross-section tee structure is used after the cylindrical section to divert the gas. The improvement of the combustion chamber structure allows the gas to be fully mixed to achieve the purpose of uniform flow, thereby improving the uniformity of the gas temperature.

[0028] Parts of the present invention that are not described in detail belong to common knowledge among those skilled in the art.

Claims

1. A high-temperature hydrogen-rich gas flow equalization device, characterized in that: Including head, S-shaped body, tee, grille; The S-shaped body includes an integrally processed cylindrical section and an S-shaped corner section, the grille is installed at the bottom end of the cylindrical section, the upper part of the cylindrical section is connected to the head, and the bottom end of the S-shaped corner section is connected to the tee inlet; the tee is designed with a variable cross-section flow channel, and the side outlet is a conical structure. The ratio d1 / d0 of the diameter d1 of each grille hole to the diameter d0 of the cylindrical section is 0.05 to 0.1; the ratio L / R of the length L of the cylindrical section to the corner radius R of the S-shaped corner section is 0.9 to 1.

2.

2. A high-temperature hydrogen-rich gas flow equalization device according to claim 1, characterized in that: The tee side outlet cone angle θ is less than 10°.

3. A high-temperature hydrogen-rich gas flow equalization device according to claim 1, characterized in that: The three-way variable cross-section flow channel increases the flow channel area at the corners.

4. A high-temperature hydrogen-rich gas flow equalization device according to claim 1, characterized in that: Except for the head, other parts that come into contact with gas are made of high-strength and high-temperature resistant high-temperature alloy materials.

5. A high-temperature hydrogen-rich gas flow equalization device according to claim 1, characterized in that: The grille is a concave arc structure.

6. A high-temperature hydrogen-rich gas flow equalization device according to claim 1, characterized in that: During operation, the oxidant and fuel enter the head and burn, and the combustion products enter the cylindrical section of the S-shaped body. After being disturbed by the grille, they turn at the S-shaped corner section of the S-shaped body, and finally pass through the tee to enter the downstream components.

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