A large nozzle support structure for water jet noise reduction

Abstract

The present application belongs to the field of rocket launching system ground equipment engineering application, and discloses a large nozzle support structure for water spraying noise reduction. The large nozzle support structure comprises a large nozzle, a detachable half-ring hoop with vibration isolation plastic pad, a large nozzle butt flange, a water spraying vertical main conveying pipe, a vertical main conveying pipe circumferential fixed support leg, a water supply flexible hose butt flange, a water supply flexible hose, a large nozzle triangular support, a water spraying vertical main conveying pipe fixed triangular support and a vertical main conveying pipe lateral fixed support column. The present application is connected and applied in a three-dimensional space through the water supply flexible hose, the circumferential welded fixed support leg, the detachable half-ring hoop with vibration isolation plastic pad, the large nozzle triangular support, the water spraying vertical main conveying pipe fixed triangular support and the vertical main conveying pipe lateral fixed support column, so as to ensure the stable support of the large nozzle under the action of large-flow water spraying and rocket gas dynamic pressure load.

Description

Technical Field

[0001] This invention relates to a large nozzle support structure for water spray noise reduction, used for space support of large nozzles used for water spray noise reduction of rocket high-temperature exhaust flames on satellite launch platform, belonging to the field of ground equipment engineering applications for rocket launch systems. Background Technology

[0002] During rocket launch, the aerodynamic noise generated by the high-temperature gas jet can reach over 170 dB, posing a significant threat to instruments, personnel, loads, structures, and ground facilities. Spraying water into the rocket engine's gas jet field during ignition is the most effective cooling and noise reduction solution. The cooling water atomizes into fine droplets, which contact the high-temperature gas and rapidly vaporize, effectively cooling the gas and absorbing noise. The method of using water to suppress rocket jet noise has been widely applied abroad. In the United States, the main water jet noise reduction technology has evolved from single-stage water spraying near the deflector in the 1960s to two-stage water spraying, with one stage near the deflector and the other near the launch platform. In recent years, the Falcon Heavy launch vehicle's water jet noise reduction system has further researched timing-controlled automatic water spraying technology, achieving the effect of the water curtain simultaneously reaching the high-temperature gas flow area when the launch vehicle reaches the nozzle height of the second-stage water spray device during takeoff. The Ariane 5 launch vehicle uses a four-stage water jet system: the first-stage water jet is located near the flow guide hole on the launch platform; the second-stage and third-stage water jets are located on opposite sides of the launch platform, with their heights offset; and the fourth-stage water jet is located near the flow guide slot near the launch platform.

[0003] In 2016, my country first adopted two-stage water jet noise reduction technology at the Wenchang Space Launch Site in Hainan. A newly built smart launch site has adopted an innovative two-stage water jet system. The first-stage water jet device is located near the launch platform and the guide channel. The second-stage water jet adopts an automatic control water jet technology that combines timing and takeoff signal. This is the first time that a large nozzle has been used in a domestic launch site to carry out spatial three-dimensional high-flow water curtain spray technology. Among them, the single-nozzle water flow rate of the large nozzle reaches more than 2t / s, the pressure before spraying is about 0.6MPa, the nozzle installation height is 7m, the nozzle weight is about 700kg, the main water spray pipeline is DN600, the reaction force of the nozzle spraying water during the spraying process reaches 54000N, the overturning moment reaches 378000N·m, the gas pressure load of the launch pad is as high as 600kPa, and the vibration level of the main water spray pipeline reaches more than 20g. In addition to meeting the force load of various working conditions, the support structure of the large nozzle must also eliminate the water hammer vibration load under the opening and closing of the water spray valve and the high-frequency vibration transmission of the rocket gas jet, and meet the needs of nozzle replacement and sealing maintenance. Therefore, a reasonable support structure needs to be designed for the support of the large nozzle. Summary of the Invention

[0004] The purpose of this invention is to provide a large nozzle support structure for water spray noise reduction, which can be used as a large secondary nozzle space support structure for water spray noise reduction on a launch platform.

[0005] This invention is implemented as follows:

[0006] The large nozzle support structure includes several parts: a detachable semi-circular clamp with vibration-damping plastic pads 2, a large nozzle docking flange 3, a vertical main water delivery pipe 4, a circumferential fixed support for the vertical main delivery pipe 5, a flexible water supply hose docking flange 6, a flexible water supply hose 7, a large nozzle triangular support 8, a fixed triangular support for the vertical main water delivery pipe 9, and a lateral fixed support column for the vertical main delivery pipe 10. The flexible water supply hose 7 is connected to the vertical main delivery pipe 4 above it via the flexible water supply hose docking flange 6. The vertical main water delivery pipe 4 is connected to the large nozzle 1 above it via the large nozzle docking flange 3. The lower part of the vertical main water delivery pipe 4 is vertically fixed to the ground by four circumferential fixed support legs 5. The two lateral fixed support columns 10 of the main water delivery pipe are welded to the ground and stand on one side of the vertical main water delivery pipe 4. The detachable semi-ring clamp 2 with vibration isolation plastic pad is bolted to the outside of the large nozzle 1. The outer wall of the detachable semi-ring clamp 2 with vibration isolation plastic pad is welded to the triangular support 8 of the large nozzle. The triangular support 8 of the large nozzle is welded and fixed between the two lateral fixed support columns 10 of the main water delivery pipe, thereby fixing the large nozzle 1 and the lateral fixed support column 10 of the main water delivery pipe. The triangular structure of the two triangular supports 9 of the vertical main water delivery pipe is welded to the corresponding positions of the upper and lower parts of the lateral fixed support column 10 of the main water delivery pipe and the vertical main water delivery pipe 4.

[0007] Furthermore, the flexible water supply hose 7 can effectively absorb the instantaneous water hammer and vibration generated when the bottom water supply valve is opened / closed, while reducing the transmission of rocket gas vibration through the pipeline towards the valve.

[0008] Furthermore, there are four circumferential fixed support legs for the vertical main delivery pipe, which adopt an inverted "L" shape structure. They are arranged circumferentially around the bottom of the vertical main delivery pipe 4, with one end welded to the ground and the other end welded to the vertical main delivery pipe, so as to support the vertical main delivery pipe and evenly balance the load of water spray and gas.

[0009] Furthermore, the detachable semi-circular clamp 2 with vibration-damping plastic pads connects two semi-circular clamps together with bolts, which serves to transmit the reverse thrust of water spray from large nozzles, isolate vibrations, and facilitate replacement and disassembly.

[0010] Furthermore, the vibration-damping plastic pad is made of high-temperature resistant polytetrafluoroethylene and is located on the inner wall of the semi-circular clamp 2.

[0011] Furthermore, the large nozzle triangular support 8 is welded and fixedly connected to the detachable semi-circular clamp 2 with vibration-damping plastic pad and the lateral fixed support column 10 of the vertical main delivery pipe. The triangular structure plays a role in stably transmitting the reverse thrust of the large nozzle.

[0012] Furthermore, the two vertical main water delivery pipe fixed triangular supports 9 are welded to the vertical main delivery pipe lateral fixed support columns 10 with upper and lower triangular rigid stabilization, which play a role in supporting the vertical main water delivery pipe and transmitting force load in a triangular rigid stabilization.

[0013] Furthermore, the lateral fixed support column 10 of the vertical main delivery pipe adopts a cylindrical straight pipe section and its bottom plate is welded to the fixed foundation, which can transfer the force load to the foundation from top to bottom. At the same time, the symmetrical lateral arrangement can effectively decompose and balance the force load in different spatial directions under positive and negative pressure at each stage of takeoff when the large nozzle sprays water and gas.

[0014] A large flow of cooling water is sequentially sprayed out through a flexible water supply hose, a vertical main water delivery pipe, and a large nozzle. The water is sprayed onto the high-temperature gas above the launch pad and below the rocket engine for cooling and noise reduction. The designed support structure serves to support and fix the large nozzle.

[0015] The outstanding advantages of this invention are: through the ingenious combination and application of structures such as flexible water supply hose, circumferentially welded fixed support leg, detachable semi-circular clamp with vibration-damping plastic pad, large nozzle triangular support, fixed triangular support for vertical main water delivery pipe, and lateral fixed support column for vertical main delivery pipe in three-dimensional space, the stable support of large nozzle under the action of high flow water spray and rocket gas dynamic pressure load is ensured.

[0016] The effects of this invention are as follows: In single pipelines, all water spraying tests of the entire system, and rocket flight missions, the structural strength of this support structure has well ensured the firmness and stability of the installation of large nozzles during water spraying and rocket takeoff, and will continue to play a role in subsequent flight missions; the application of this structure has enabled the first use of large nozzles for space three-dimensional high-flow water curtain spraying technology on domestic launch pads. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the present invention. 1 is a large nozzle, 2 is a detachable semi-circular clamp with vibration-damping plastic pads, 3 is a large nozzle connecting flange, 4 is a vertical main water delivery pipe, 5 is a circumferential fixed support leg for the vertical main delivery pipe, 6 is a connecting flange for a flexible water supply hose, 7 is a flexible water supply hose, 8 is a triangular support for the large nozzle, 9 is a fixed triangular support for the vertical main water delivery pipe, and 10 is a lateral fixed support column for the vertical main delivery pipe. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0019] From the appendix Figure 1 As shown, the large nozzle support structure for water spray noise reduction of the present invention includes several parts, such as: 2. a detachable semi-circular clamp with vibration-damping plastic pads; 3. a large nozzle docking flange; 4. a vertical main water delivery pipe; 5. a circumferential fixed support for the vertical main delivery pipe; 6. a docking flange for a flexible water supply hose; 7. a flexible water supply hose; 8. a large nozzle triangular support; 9. a fixed triangular support for the vertical main water delivery pipe; and 10. a lateral fixed support column for the vertical main delivery pipe.

[0020] Cooling water is sequentially sprayed out through a flexible water supply hose 7, a vertical main water supply pipe 4, and a large nozzle 1. The flexible water supply hose 7 is connected to the vertical main water supply pipe 4 above it via a flexible water supply hose flange 6. The vertical main water supply pipe 4 is connected to the large nozzle 1 above it via a large nozzle flange 3. The lower part of the vertical main water supply pipe 4 is fixed vertically to the ground by four circumferentially fixed support legs 5. The lateral fixed support columns 10 of the vertical main water supply pipe are divided into two parts, with their base plates welded to the ground and standing upright on one side of the vertical main water supply pipe 4. The detachable semi-circular clamp 2 with vibration-damping plastic pads connects two semi-circular clamps together with bolts and wraps around the large nozzle 1. The outer wall of the detachable semi-circular clamp 2 with vibration-damping plastic pads is welded to the triangular support 8 of the large nozzle. The triangular support 8 of the large nozzle is welded and fixed between the two vertical main delivery pipe lateral fixed support columns 10, thereby fixing the large nozzle 1 and the vertical main delivery pipe lateral fixed support columns 10. The triangular structure of the two water spraying vertical main delivery pipe fixed triangular supports 9 is welded to the corresponding positions at the upper and lower parts of the vertical main delivery pipe lateral fixed support columns 10 and the water spraying vertical main delivery pipe 4, respectively.

[0021] The flexible water supply hose 7 connection structure is designed to effectively absorb the instantaneous water hammer and vibration generated when the bottom water supply valve is opened / closed, while also reducing the transmission of rocket gas vibration through the pipeline towards the valve.

[0022] The structure of the circumferential fixed support legs 5 for the vertical main delivery pipe is designed with an inverted "L" shape. It is arranged circumferentially around the bottom of the vertical main delivery pipe 4, with one end welded to the ground and the other end welded to the vertical main delivery pipe 4. It provides gravity support for the vertical main delivery pipe 4 and balances the horizontal and torsional loads from the water spray reaction and gas combustion. The circumferential arrangement of the four support legs is conducive to the uniform distribution of loads and the balance of torsional loads.

[0023] The detachable semi-circular clamp 2 structure with vibration-damping plastic pads is used to connect two semi-circular clamps with bolts. The vibration-damping plastic pads are made of high-temperature resistant polytetrafluoroethylene and serve to transmit the reverse thrust of water spray from large nozzles, isolate vibrations, and facilitate replacement and disassembly.

[0024] The large nozzle triangular support structure 8 is used to weld and fix the detachable semi-ring clamp 2 with vibration isolation plastic pad and the lateral fixed support column 10 of the vertical main delivery pipe through a cylindrical pipe section, so as to transmit the reverse thrust of the large nozzle. The triangular structure is conducive to the decomposition of force and the structural strength.

[0025] The fixed triangular support structure 9 for the vertical main water delivery pipe is designed to support the vertical main water delivery pipe 4 and transmit force loads in a triangular rigid stable manner by welding the upper and lower triangular rigid support columns 10 to the vertical main delivery pipe.

[0026] The vertical main delivery pipe is laterally fixed with support columns 10. Its function is to use a cylindrical straight pipe section with its bottom plate welded to a fixed foundation, so that the force load can be transferred from top to bottom to the foundation. At the same time, the two support columns are symmetrically arranged laterally, which can effectively decompose and balance the force load in different spatial directions under positive and negative pressure at each stage of takeoff when the large nozzle sprays water and gas.

[0027] In summary, the above measures, through the ingenious spatial combination and connection of structures such as flexible water supply hoses, circumferentially welded fixed support legs, detachable semi-circular clamps with vibration-damping rubber, large nozzle triangular supports, fixed triangular supports for the vertical main water delivery pipe, and lateral fixed support columns for the vertical main delivery pipe, ensure the stable support of the large nozzle under the action of high-flow water spray and rocket gas dynamic pressure load.

Claims

1. A large nozzle support structure for water spray noise reduction, characterized in that, The support structure includes several parts: a detachable semi-circular clamp with vibration-damping plastic pads (2), a large nozzle docking flange (3), a vertical main water delivery pipe (4), a circumferential fixed support leg for the vertical main delivery pipe (5), a flexible water supply hose docking flange (6), a flexible water supply hose (7), a large nozzle triangular support (8), a fixed triangular support for the vertical main water delivery pipe (9), and a lateral fixed support column for the vertical main delivery pipe (10). The flexible water supply hose (7) is connected to the vertical main delivery pipe (4) above it via the flexible water supply hose connecting flange (6). The vertical main delivery pipe (4) is connected to the large nozzle (1) above it via the large nozzle connecting flange (3). The vertical main delivery pipe (4) is fixed vertically to the ground by four vertical main delivery pipe circumferential fixed support legs (5). The vertical main delivery pipe lateral fixed support column (10) is divided into two, and its base plate is welded to the ground and erected on one side of the vertical main delivery pipe (4). The removable semi-circular clamp (2) with vibration isolation plastic pad is also present. The outer wall of the detachable semi-ring clamp (2) with vibration isolation plastic pad is welded to the large nozzle triangular support (8) by bolt connection. The large nozzle triangular support (8) is welded and fixed between the two vertical main conveying pipe lateral fixed support columns (10), thereby fixing the large nozzle (1) and the vertical main conveying pipe lateral fixed support column (10). The triangular structure of the two water spraying vertical main conveying pipe fixed triangular support (9) is welded to the corresponding positions of the upper and lower parts of the vertical main conveying pipe lateral fixed support column (10) and the water spraying vertical main conveying pipe (4).

2. The large nozzle support structure according to claim 1, characterized in that, The flexible water supply hose (7) can effectively absorb the instantaneous water hammer and vibration generated when the bottom water supply valve is opened / closed, while reducing the transmission of rocket gas vibration to the valve through the pipeline.

3. The large nozzle support structure according to claim 1, characterized in that, There are four circumferential fixed support legs for the vertical main delivery pipe. They adopt an inverted "L" shape structure and are arranged circumferentially around the bottom of the vertical main delivery pipe (4). One end is welded to the ground and the other end is welded to the vertical main delivery pipe, which supports the vertical main delivery pipe and evenly balances the water and gas force load.

4. The large nozzle support structure according to claim 1, characterized in that, The detachable semi-circular clamp with vibration isolation plastic pad (2) connects two semi-circular clamps with bolts, which can transmit the water spraying reverse force of large nozzles, isolate vibration, and replace and disassemble.

5. The large nozzle support structure according to claim 4, characterized in that, The vibration isolation plastic pad is made of high temperature resistant polytetrafluoroethylene and is located on the inner wall of the semi-circular clamp (2).

6. The large nozzle support structure according to claim 1, characterized in that, The large nozzle triangular support (8) welds and fixes the detachable semi-ring clamp (2) with vibration isolation plastic pad and the vertical main delivery pipe lateral fixed support column (10). The triangular structure plays a stable role in transmitting the large nozzle's reverse thrust.

7. The large nozzle support structure according to claim 1, characterized in that, The two vertical main water delivery pipes are fixed with triangular supports (9) and welded to the vertical main delivery pipe lateral fixed support column (10) using two layers of triangular rigid stability. This serves to support the vertical main water delivery pipes and transmit force loads in a triangular rigid stability manner.

8. The large nozzle support structure according to claim 1, characterized in that, The vertical main delivery pipe lateral fixed support column (10) adopts a cylindrical straight pipe section and its bottom plate is welded to a fixed foundation. It can transmit the force load to the foundation from top to bottom. At the same time, the symmetrical lateral arrangement can effectively decompose and balance the force load in different spatial directions under positive and negative pressure at each stage of takeoff when the large nozzle sprays water and gas.

Images