Variable-angle speed-increasing type large-flow duckbilled nozzle for rocket launching water spraying and noise reduction

Abstract

The invention relates to an angle-adjustable, low-flow-resistance, speed-increasing and large-flow nozzle suitable for a water spraying noise reduction system of a rocket launching pad, and belongs to the technical field of rocket launching. The invention discloses a variable-angle speed-increasing type large-flow duckbilled nozzle for rocket launching water spraying and noise reduction. The variable-angle speed-increasing type large-flow duckbilled nozzle is composed of a butt flange, an elbow, a duckbilled opening, a supporting plate, a flow dividing partition plate, a switching pipeline, an inclination angle flange and a parallel flange. The nozzle is fixedly connected with the water spraying pipeline through a butt flange and a bolt; the nozzle faces a rocket flame direction; the nozzle realizes water spraying angle adjustment by changing the angle of the elbow and the mounting angle; the inner surface of the nozzle is smooth, and the flow resistance loss is reduced to the minimum by optimizing the molded surface design of a duckbilled opening flow channel; a supporting plate is arranged to prevent nozzle shape change caused by reverse force in the water spraying process, and the nozzle structure stability is guaranteed; the flow dividing partition plate is arranged to restrain jet flow separation, reduce the thickness of a sprayed liquid film, increase the jet flow strength of unit area and achieve good cooling and noise reduction effects. The device has the characteristics of simple structure, adjustable injection angle, small flow resistance loss, large injection flow, small liquid film thickness and concentrated energy, and can be suitable for rocket launching water spray systems with different flow grades, injection flow speeds and injection angles.

Description

Technical Field

[0001] The present invention relates to a nozzle applicable to a water spraying noise reduction system of a rocket launch pad, which has the characteristics of adjustable spraying angle, low flow resistance, large injection flow rate, and water flow acceleration, and belongs to the technical field of rocket launch. Background Art

[0002] Adopting the water spraying noise reduction technology is an effective means for major launch sites at home and abroad to suppress the gas flow noise of large rocket launches and protect the launch pad body from the impact of heat flow. Adopting a larger flow rate of water spraying is an effective measure to effectively suppress the strong noise of the launch jet and protect the test stand, and it is also the development direction of the water spraying noise reduction technology of the launch pad. There is information indicating that the peak value of the water spraying flow rate during the launch of the US heavy-lift rocket exceeds 200 t / s, and the amount of water sprayed is huge. In addition to the water spraying flow rate, the water spraying speed, angle, thickness, and intervention position all have a relatively significant impact on the water spraying noise reduction and cooling effect. The current high-position water tank water supply method adopted by the water spraying noise reduction system conveys water with a certain pressure to the water spraying pipelines around the launch pad through pipelines, and sprays it into the diversion trough through multiple groups of nozzles installed on the water spraying, so as to achieve the purpose of noise reduction and cooling. Since the head provided by the high-position water tank is limited, it is necessary to overcome the head loss brought by the pipeline and valve components. At the same time, in order to ensure sufficient injection speed and water spraying distance, a certain injection pressure and spraying area must be ensured in front of the nozzle. Therefore, the nozzle used in the water spraying noise reduction system must have the characteristics of small flow resistance along the way, large flow rate, large spraying area, and concentrated energy, so as to meet the use requirements of the water spraying noise reduction system. Summary of the Invention

[0003] The purpose of the present invention is to provide a large nozzle with low flow resistance loss, large injection flow rate, and a certain spraying angle and coverage area for the water spraying noise reduction system of rocket launches.

[0004] The above purpose is achieved by the following solution:

[0005] A variable-angle speed-increasing large-flow duckbill nozzle for water spraying noise reduction in rocket launches, characterized in that the nozzle includes a transition pipeline (1), an elbow (2), a duckbill opening (3), a support plate (4), a diversion partition (5), a transition pipeline (6), an inclination flange (7), and a parallel flange (8).

[0006] According to the above nozzle, it is characterized in that the nozzle has a small flow resistance. The inner surface of the nozzle is smooth, and the roughness ≤ 0.01 mm; the elbow (2) and the duckbill opening (3) are integrally cast or welded and then polished to achieve a smooth transition; the elbow (2) is an equal-diameter elbow, the angle of the elbow (2) is ф2, the diameter is D, and ф2 ≥ 90°; the turning radius of the elbow (2) is R, and R ≥ 1.5D.

[0007] According to the above-mentioned nozzle, it is characterized in that the water spraying angle of the nozzle is adjustable; the nozzle is connected to the water spraying pipeline through an adapter pipeline (6); both ends of the adapter pipeline (6) are flanges, one of which is an inclined flange (7), that is, the included angle with the orthogonal plane of the axis of the adapter pipeline (6) is ф1, and the other flange is a parallel flange (8), that is, parallel to the orthogonal plane of the axis of the adapter pipeline (6); the water spraying turning angle at the nozzle outlet is ф1 + ф2; the change of the water spraying angle is achieved by replacing the adapter pipeline (6) with different angles ф1 of the inclined flange (7).

[0008] According to the above-mentioned nozzle, it is characterized in that the nozzle can accelerate the water flow at the outlet and ensure a certain water flow spraying area and spraying shape; the duckbill opening (3) is a gradually reducing opening, and the cross-sectional area of the duckbill opening (3) gradually linearly decreases compared with the cross-sectional area of the elbow (2); the profile of the duckbill opening (3) is as Figure 1 shown in the view A in [the figure], a flow dividing partition plate (5) is arranged inside the duckbill to inhibit jet separation and reduce the thickness of the jet liquid film; a support plate (4) as shown in the figure is arranged between the duckbill opening (3) and the elbow (2).

[0009] The advantages of this low-flow-resistance and large-flow-rate nozzle for rocket launch water spraying noise reduction are as follows:

[0010] 1) The nozzle has a simple structure and wide applicability. It can be applied to rocket launch water spraying systems with different flow rate grades, spraying flow velocities, and spraying angles.

[0011] 2) The nozzle has a small flow resistance, which can greatly reduce the flow resistance loss caused by the change of the profile, thereby reducing the height setting of the water tank in the water spraying noise reduction system and greatly reducing the cost of the rocket water spraying noise reduction system.

[0012] 3) The thickness of the liquid film on the spraying surface of the nozzle is small and the energy is concentrated, which is beneficial to increasing the jet intensity per unit area, improving the heat exchange efficiency in the process of water spraying noise reduction, and having a good noise reduction and temperature reduction effect. Description of the Drawings

[0013] Attached Figure 1 is a schematic composition diagram of a low-flow-resistance and large-flow-rate nozzle for rocket launch water spraying noise reduction;

[0014] Attached Figure 2 is a schematic diagram of the distance L between the end face of the duckbill opening (3) of the nozzle and the end face of the elbow (2);

[0015] Attached Figure 3 is a schematic structural diagram of a low-flow-resistance and large-flow-rate nozzle for rocket launch water spraying noise reduction. Detailed Embodiments

[0016] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0017] As shown in the attached Figure 1As shown, the present invention is composed of a butt flange (1), an elbow (2), a duckbill (3), a support plate (4), a flow dividing baffle (5), a transfer pipe (6), an angle flange (7), and a parallel flange (8).

[0018] The low flow resistance and large flow nozzle for water spraying noise reduction for rocket launch proposed by the present invention is connected and fixed to the water spray pipe through a docking flange (1) and bolts. The nozzle faces the direction of the rocket flame, and the spray angle is achieved by adjusting the angle ф1 between the docking flange (1) and the horizontal plane and the angle ф2 between the elbow (2). When the angle ф1 between the docking flange (1) and the inclined flange (7) and the horizontal plane is adjusted, the installation angle of the water spray pipe also changes accordingly. Figure 3 To further reduce the flow resistance, the turning radius R of the elbow (2) is ≥1.5D, and the angle ф2 is ≥90°.

[0019] After the nozzle is processed, the inner surface and welding point are polished to strictly control the roughness of the nozzle surface to ≤0.01mm.

[0020] Duckbill (3) inlet cross-sectional area A 进 The cross-sectional area of ​​the duckbill (3) outlet is equal to the cross-sectional area of ​​the elbow. Calculate, where Q is the water flow rate and ν is the nozzle outlet velocity. The cross-sectional area at any position in the flow channel of the duckbill (3) is calculated using the formula Calculate. The cross-sectional shape of the duckbill (3) is as follows Figure 1 As shown in the A-direction diagram in FIG. The outlet width S of the duckbill (3) is determined by the spray area of ​​the entire launch platform, the number of nozzles and the arrangement method. Therefore, the cross-sectional area of ​​the duckbill (3) is achieved by linearly reducing the height h of the duckbill (3).

[0021] When the nozzle starts spraying water, shuts down the water and sprays water, the elbow will have a reaction force impact, which can easily cause the shape of the nozzle to change, increase the flow resistance of the nozzle and change the spray angle. The support plate (4) shown in the figure is arranged between the duckbill (3) and the elbow (2) to prevent the nozzle shape from changing by local reinforcement, thereby ensuring the stability of the nozzle structure.

[0022] A flow dividing baffle (5) is arranged inside the duckbill (3). Through simulation analysis and theoretical calculation, it can be known that this structure can suppress the separation of the liquid flow in the thickness direction, reduce the thickness of the liquid film at the injection outlet, and concentrate the water jet on the set injection working surface, which is beneficial to increase the jet intensity per unit area of ​​the injection surface of the arrow body, improve the heat exchange efficiency of the water spray noise reduction process, and obtain better noise reduction and temperature reduction effects.

[0023] The contents not described in detail in the present invention are well known to those skilled in the art.

Claims

1. A variable angle speed increasing large flow duckbill nozzle for water spraying and noise reduction for rocket launch, characterized in that: The nozzle comprises a butt flange (1), an elbow (2), a duckbill (3), a support plate (4), a flow dividing baffle (5), a transfer pipe (6), an angle flange (7), and a parallel flange (8).

2. According to the above-mentioned nozzle, it is characterized in that The nozzle has a small flow resistance; the inner surface of the nozzle is smooth, with a roughness of ≤0.01 mm; the elbow (2) and the duckbill (3) are integrally cast or welded and polished to achieve a smooth transition; the elbow (2) is an equal-diameter elbow, the angle of the elbow (2) is ф2, the diameter is D, and ф2≥90° is satisfied; the turning radius of the elbow (2) is R, and R≥1.5D is satisfied.

3. According to the above-mentioned nozzle, it is characterized in that The water spraying angle of the nozzle is adjustable; the nozzle is connected to the water spraying pipe through a transfer pipe (6); both ends of the transfer pipe (6) are flanges, one of which is an inclined flange (7), that is, the angle between the flange and the plane perpendicular to the axis of the transfer pipe (6) is ф1, and the other flange is a parallel flange (8), that is, parallel to the plane perpendicular to the axis of the transfer pipe (6); the water spraying turning angle of the nozzle outlet is ф1+ф2; the water spraying angle can be changed by replacing the transfer pipe (1) with a different inclined flange angle ф1.

4. According to the above-mentioned nozzle, it is characterized in that The nozzle can accelerate the water flow at the outlet and ensure a certain water flow spray area and spray shape; the duckbill (3) is a gradually narrowing mouth, and the cross-sectional area of ​​the duckbill (3) gradually decreases linearly compared with the cross-sectional area of ​​the elbow (2); the profile of the duckbill (3) is shown in the A view in Figure 1, and a diversion baffle (5) is arranged inside the duckbill to suppress jet separation and reduce the thickness of the jet liquid film; a support plate (4) as shown in the figure is arranged between the duckbill (3) and the elbow (2).

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