Noise reduction system for pantograph cavity of high-speed train

Abstract

The invention discloses a noise reduction system for a pantograph cavity of a high-speed train, which comprises a flow guide cover arranged at the front end of the pantograph cavity, a high-speed airflow collector and a jet air source storer, and a plurality of jet nozzles are arranged on the rear wall surface of the flow guide cover. The high-speed airflow collector is composed of a plurality of high-speed airflow collecting units arranged on the vehicle roof in front of the flow guide cover, each high-speed airflow collecting unit is composed of a mounting base, a flow guide pipe and a plurality of airflow collecting covers, each airflow collecting cover is provided with an airflow inlet and an airflow outlet, and the airflow collecting covers are symmetrically and fixedly arranged on the flow guide pipe in a V shape; the airflow inlet faces the front of the high-speed train, the airflow outlet is communicated with the drainage pipe, the tail end of the drainage pipe is communicated with an air inlet of the jet flow air source storage device, and an air outlet of the jet flow air source storage device is communicated with the corresponding jet flow nozzle. Jet flow noise reduction can be carried out on the pantograph cavity without an additional air source, and the remarkable cooperative noise reduction effect is achieved.

Description

Technical Field

[0001] The invention relates to a noise reduction system for a pantograph cavity of a high-speed train, and belongs to the technical field of noise reduction of high-speed trains. Background Art

[0002] With the rapid development of high-speed railways, the running speed of high-speed trains is constantly increasing. When the train speed exceeds 300km / h, aerodynamic noise will become the main noise generated by the train, and the growth rate of the sound pressure level of aerodynamic noise is the sixth power of the running speed. Therefore, aerodynamic noise has become an important problem that needs to be solved for the speed increase of high-speed trains. The pantograph area of ​​high-speed trains is one of the main sources of aerodynamic noise of high-speed trains. Therefore, it is of great significance to study the noise reduction of aerodynamic noise in the pantograph area of ​​high-speed trains.

[0003] At present, there are few noise reduction measures for the pantograph area of ​​high-speed trains at home and abroad. The most commonly used one is to add a deflector at the front end of the pantograph area. Although this measure can reduce the collision of high-speed airflow on the pantograph, it increases the aerodynamic noise of the airflow on the deflector and generates additional cavity noise. The applicant disclosed a high-speed train pantograph cavity aerodynamic noise reduction system based on intelligent jet in a patent application with application number 202111645561.3. The system includes a central control mechanism and a gas intelligent jet generating mechanism. The gas intelligent jet generating mechanism includes a high-pressure gas source, a proportional pressure regulating valve, a pressure sensor, a proportional gas flow valve, a flow sensor and an injector connected in sequence through a gas pipeline. The injection port of the injector is located on the leeward side of the pantograph cavity of the train. The proportional pressure regulating valve, the pressure sensor, the proportional gas flow valve, and the flow sensor are electrically connected to the central control mechanism respectively. Although the application changes the shear layer above the pantograph cavity by means of gas jet, which can reduce the aerodynamic noise in the pantograph cavity area to a certain extent and achieve the purpose of reducing noise, the application requires a high gas velocity and multiple gas control devices to meet the operation requirements, which increases the additional sound source on the one hand and the volume and maintenance cost on the other. Therefore, it is of practical significance and wide application value to study a noise reduction system with good noise reduction effect and low use cost. Summary of the invention

[0004] In view of the above problems and requirements in the prior art, an object of the present invention is to provide a noise reduction system for a pantograph cavity of a high-speed train having good noise reduction effect and low use cost.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A noise reduction system for a pantograph cavity of a high-speed train comprises a deflector arranged at the front end of the pantograph cavity, a plurality of jet nozzles are arranged on the rear wall surface of the deflector, a high-speed airflow collector and a jet air source storage device, the high-speed airflow collector is composed of a plurality of high-speed airflow collecting units arranged on the roof in front of the deflector, the high-speed airflow collecting units are composed of a mounting seat, a drainage pipe and a plurality of airflow collecting hoods, the airflow collecting hood is provided with an airflow inlet and an airflow outlet, a plurality of airflow collecting hoods are symmetrically fixed on the drainage pipe in a V shape, and the airflow inlet faces the front of the high-speed train, the airflow outlet is connected to the drainage pipe, the end of the drainage pipe is connected to the air inlet of the jet air source storage device, and the air outlet of the jet air source storage device is connected to the jet nozzle corresponding to it.

[0007] In one implementation scheme, the mounting seat is a four-slope roof-like structure, wherein the front and rear slopes are mirror-symmetrical isosceles triangles, and the left and right slopes are mirror-symmetrical isosceles trapezoids, the inner cavity of the mounting seat is a V-shaped groove with an opening facing downward, and a drainage pipe inlet is provided on the front slope, a drainage pipe outlet is provided on the rear slope, and a plurality of airflow collection hood mounting holes are symmetrically provided on the left and right slopes.

[0008] In one implementation scheme, the airflow collection hood is composed of a spherical hood body and a truncated cone-shaped collection pipe that is larger at the top and smaller at the bottom, and the spherical hood body is connected to the truncated cone-shaped collection pipe, the airflow inlet is opened on the spherical hood body, and the airflow outlet is the outlet of the truncated cone-shaped collection pipe.

[0009] In one embodiment, the truncated cone-shaped collecting pipe is fixed on the drainage pipe with its center line tilted at an angle of 45 degrees to the horizontal plane.

[0010] In one embodiment, the air flow inlet section is composed of two semicircular sections perpendicular to each other, wherein the transverse semicircular section is flush with the surface of the mounting seat, and wherein the vertical semicircular section protrudes from the surface of the mounting seat and faces the front of the high-speed train.

[0011] In one implementation manner, the jet gas source storage is fixedly arranged in the flow guide cover.

[0012] In one embodiment, the front wall surface of the jet gas source storage device is in an arc shape, and the rear wall surface of the jet gas source storage device is in an isosceles trapezoidal shape.

[0013] In one embodiment, a plurality of air inlet pipe joints are arranged at intervals on the front wall surface of the jet air source storage device, and the air inlet pipe joints pass through the front wall of the air guide cover and can be socketed with the corresponding ends of the drainage pipes, and air outlets corresponding to and connected to the jet nozzles are provided on the rear wall surface of the jet air source storage device.

[0014] In one embodiment, the bottom circumference of the mounting seat is provided with an outwardly extending mounting edge A, and the mounting edge A is provided with a bolt hole A for fixed connection with the roof; the bottom circumference of the jet air source storage is provided with an outwardly extending mounting edge B, and the mounting edge B is provided with a bolt hole B for fixed connection with the roof.

[0015] In one embodiment, the jet nozzles are arranged in one row or multiple rows, and each jet nozzle is installed tilted with its center line forming an acute angle with the roof plane.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are:

[0017] The present invention collects and stores the high-speed airflow in front of the air deflector through ingenious structural design, which not only realizes jet noise reduction of the pantograph cavity without an additional air source, but also reduces the resistance to the train operation caused by the impact of the high-speed airflow on the air deflector, and also reduces the aerodynamic noise generated by the high-speed airflow in the air deflector; in particular, the present invention has learned through simulation analysis that by adopting the noise reduction system of the present invention, a significant synergistic noise reduction effect can be achieved, and the aerodynamic noise of the pantograph cavity can be reduced by 4 to 7 decibels for high-speed trains running at a speed of 400 km / h; in addition, the noise reduction system of the present invention is easy to realize mass production and easy to assemble on the roof of a high-speed train, so as to facilitate the modification and application of existing high-speed trains; therefore, compared with the prior art, the present invention not only has significant application value, but also has significant advancement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a noise reduction system for a high-speed train pantograph cavity provided by an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A top view of the noise reduction system shown;

[0020] Figure 3 yes Figure 1 A partial cross-sectional structural diagram of the noise reduction system shown;

[0021] Figure 4 Schematic diagram of the assembly structure of the high-speed airflow collector and the jet air source storage device described in the embodiment;

[0022] Figure 5 yes Figure 4 A partial cross-sectional structural diagram of the assembly shown;

[0023] Figure 6 is a schematic structural diagram of the high-speed airflow collection unit described in the embodiment;

[0024] Figure 7is a schematic structural diagram of an assembly of a drainage tube and an airflow collection cover in an embodiment;

[0025] Figure 8 yes Figure 7 A schematic diagram of the top view of the assembly shown;

[0026] Fig. 9 yes Figure 7 A schematic diagram of the front view of the assembly shown;

[0027] Fig.10 yes Figure 7 A partial cross-sectional structural diagram of the assembly shown;

[0028] Fig.11 is a schematic diagram of a top view of the mounting base described in the embodiment;

[0029] Fig.12 is a bottom view structural diagram of the mounting base described in the embodiment;

[0030] Fig.13 is a schematic structural diagram of the airflow collection hood described in the embodiment;

[0031] Fig.14 yes Fig.13 The schematic diagram of the structure of the airflow collection hood shown in another perspective;

[0032] Fig.15 yes Figure 6 A partial right side view of the high-speed airflow collecting unit shown;

[0033] Fig.16 is a schematic structural diagram of the jet gas source storage device described in the embodiment;

[0034] Fig.17 yes Fig.16 A schematic diagram of the top view of the jet gas source storage device shown;

[0035] Fig.18 is a schematic structural diagram of the air guide cover described in the embodiment;

[0036] Fig.19 This is a state diagram showing that the noise reduction system provided by an embodiment of the present invention is installed on a high-speed train;

[0037] Fig. 20 It is a model diagram for simulation analysis of the present invention;

[0038] Fig.21 It is a structural schematic diagram of a simulation platform for performing simulation analysis;

[0039] Fig. 22 It is the mesh division diagram of the high-speed train in the simulation model;

[0040] Fig.23 It is the mesh division diagram of the noise reduction system and pantograph in the simulation model;

[0041] Fig.24 It is the mesh division diagram of the noise reduction system in the simulation model;

[0042] Fig.25 It is the local grid division diagram of the high-speed airflow collection unit in the simulation model;

[0043] Fig.26 It is a specific distribution diagram of the noise detection points arranged when the present invention performs simulation analysis;

[0044] Fig. 27 It is a simulation analysis diagram of the noise detection points in column A of the present invention;

[0045] Fig.28 It is a simulation analysis diagram of the noise detection point of column B of the present invention;

[0046] Fig.29 It is a simulation analysis diagram of the noise detection point of row C of the present invention;

[0047] The numbers in the figure are as follows:

[0048] 1. Pantograph cavity; 2. Flow deflector; 3. Jet nozzle; 4. High-speed airflow collector; 4-1. High-speed airflow collection unit; 4-11. Mounting seat; 4-111. Front slope; 4-112. Rear slope; 4-113. Left slope; 4-114. Right slope; 4-115. Inner cavity; 4-116. Drainage pipe inlet; 4-117. Drainage pipe outlet; 4-118. Airflow collection cover mounting hole; 4-119. Mounting edge A; 4-120. Bolt hole A; 4-12. Drain Flow tube; 4-13, airflow collection cover; 4-131, spherical cover body; 4-132, truncated cone collection pipe; 4-14, airflow inlet; 4-141, transverse semicircular section; 4-142, vertical semicircular section; 4-15, airflow outlet; 5, jet gas source storage; 5-1, front wall; 5-2, rear wall; 5-3, air inlet pipe joint; 5-4, air outlet; 5-5, installation edge B; 5-6, bolt hole B; 6, roof; 7, pantograph insulator; 8, high-speed train. DETAILED DESCRIPTION

[0049] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. In addition, it should be noted that the terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. Unless otherwise defined, the technical terms or scientific terms used in the present invention should be the usual meanings understood by people with general skills in the field. The directions or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "up", "down", "left", "right", "front", "back", etc. are all based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, in the present invention, the direction in which the train moves forward is defined as the front.

[0050] Example

[0051] Please combine Figures 1 to 10 As shown, the present embodiment provides a noise reduction system for a pantograph cavity of a high-speed train, comprising a deflector 2 arranged at the front end of the pantograph cavity 1, a plurality of jet nozzles 3 are arranged on the rear wall of the deflector 2, a high-speed airflow collector 4 and a jet air source storage 5, the high-speed airflow collector 4 is composed of a plurality of high-speed airflow collecting units 4-1 arranged on the roof 6 in front of the deflector 2, the high-speed airflow collecting unit 4-1 is composed of a mounting seat 4-11, a drainage pipe 4-12 and a plurality of airflow collecting The air flow collecting hood 4-13 is composed of an air flow inlet 4-14 and an air flow outlet 4-15. A plurality of air flow collecting hoods 4-13 are symmetrically fixed on the drainage pipe 4-12 in a V-shape, and the air flow inlet 4-14 faces the front of the high-speed train, and the air flow outlet 4-15 is connected with the drainage pipe 4-12, and the end of the drainage pipe 4-12 is connected with the air inlet of the jet air source storage 5, and the air outlet of the jet air source storage 5 is connected with the corresponding jet nozzle 3.

[0052] Please see again Fig.11 and Fig.12 As shown: In this embodiment, the mounting seat 4-11 is a four-slope roof-like structure, wherein the front and rear slopes 4-111 and 4-112 are mirror-symmetrical isosceles triangles, and the left and right slopes 4-113 and 4-114 are mirror-symmetrical isosceles trapezoids, and the inner cavity 4-115 of the mounting seat 4-11 is a V-shaped groove with an opening facing downward, and a drainage pipe inlet 4-116 is provided on the front slope 4-111, and a drainage pipe outlet 4-117 is provided on the rear slope 4-112, and a plurality of airflow collection cover mounting holes 4-118 are symmetrically provided on the left and right slopes 4-113 and 4-114.

[0053] Please see again Fig.13 and Fig.14As shown: In this embodiment, the airflow collection cover 4-13 is composed of a spherical cover body 4-131 and a truncated cone-shaped collection pipe 4-132 that is larger at the top and smaller at the bottom, and the spherical cover body 4-131 is connected to the truncated cone-shaped collection pipe 4-132, the airflow inlet 4-14 is opened on the spherical cover body 4-131, and the airflow outlet 4-15 is the outlet of the truncated cone-shaped collection pipe 4-132.

[0054] Please see again Fig. 9 As shown: In this embodiment, the truncated cone-shaped collecting pipe 4-132 is fixed on the drainage pipe 4-12 with its center line tilted at an angle of 45 degrees to the horizontal plane.

[0055] Please see again Fig.13 and Fig.15 As shown: In this embodiment, the cross-section of the air flow inlet 4-14 is composed of two semicircular cross-sections that are perpendicular to each other, wherein the transverse semicircular cross-section 4-141 is flush with the surface of the mounting seat 4-11, and wherein the vertical semicircular cross-section 4-142 protrudes from the surface of the mounting seat 4-11 and faces the front of the high-speed train.

[0056] Please see again Figure 3 As shown: In this embodiment, the jet gas source storage 5 is fixedly arranged in the air guide cover 2.

[0057] Please combine again Figure 3 and Figures 16 to 18 As shown: In this embodiment, the front wall surface 5-1 of the jet air source storage device 5 is in an arc shape, and the rear wall surface 5-2 of the jet air source storage device 5 is in an isosceles trapezoidal shape; a plurality of air inlet pipe joints 5-3 are arranged at intervals on the front wall surface 5-1 of the jet air source storage device 5, and the air inlet pipe joints 5-3 pass through the front wall of the air guide cover 2 and can be socketed with the end of the corresponding drainage pipe 4-12, and an air outlet 5-4 corresponding to and connected with the jet nozzle 3 is provided on the rear wall surface 5-2 of the jet air source storage device 5.

[0058] Also, see Fig.11 and Fig.12 As shown, in this embodiment, the bottom circumference of the mounting seat 4-11 is provided with an outwardly extending mounting edge A4-119, and the mounting edge A4-119 is provided with a bolt hole A4-120 for fixed connection with the roof 6.

[0059] In addition, please see Fig.17 As shown, in this embodiment, the bottom circumference of the jet gas source storage 5 is provided with an outwardly extending mounting edge B5-5, and the mounting edge B5-5 is provided with a bolt hole B5-6 for fixed connection with the roof 6.

[0060] It should also be noted that: the jet nozzles 3 adopt the existing technology and can be arranged in one row or multiple rows, but each jet nozzle 3 is preferably installed with its center line and the roof plane at an acute angle (see Figure 3 as shown).

[0061] Fig.19 The figure shows the state of the noise reduction system of the present invention being assembled on the roof of a high-speed train. Fig.19 It can be seen that all the jet nozzles 3 are facing the windward side of the pantograph insulator 7 .

[0062] In addition, combined Figure 3 and Fig.19 As shown, when a high-speed train equipped with the noise reduction system of the present invention runs at high speed, the high-speed airflow collector 4 can collect the high-speed airflow in front of the air deflector 2 and transport it to the jet air source storage 5, and then it is sprayed toward the pantograph cavity area by the jet nozzle 3 as a jet air source, thereby realizing the jet noise reduction effect on the pantograph cavity without the need for an additional air source; at the same time, because the high-speed airflow collector 4 of the present invention is installed at the front end of the air deflector 2, it can also reduce the resistance to the train operation caused by the impact of the high-speed airflow on the air deflector 2, and can also reduce the aerodynamic noise effect generated by the high-speed airflow on the air deflector 2.

[0063] In addition, the present invention adopts SolidWorks modeling to obtain Fig. 20 The simulation model shown in Fig.21 The Ansys simulation platform shown in the figure simulates and analyzes the noise reduction effect of the high-speed train 8 using the noise reduction system of the present invention on the aerodynamic noise generated by the pantograph cavity when the simulated running speed is 400 km / h, as follows:

[0064] First, the simulation model is meshed using ICEM software. The total number of meshes is 36,683,729, which meets the mesh independence requirement. The mesh quality is between 0.16 and 1, which also meets the mesh quality requirement. For the meshing diagram of the high-speed train in the simulation model, see Fig. 22 For the meshing diagram of the noise reduction system and pantograph in the simulation model, see Fig.23 For the meshing diagram of the noise reduction system in the simulation model, see Fig.24 For the local mesh division diagram of the high-speed airflow collection unit in the simulation model, please see Fig.25 As shown; then, the Fluent software performs the following simulation analysis:

[0065] 1) Set the flow field inlet velocity to 400 km / h, about 111.1 m / s; the direction parallel to the track centerline is the X-axis direction, the direction horizontally perpendicular to the track centerline is the Z-axis direction, the direction vertically perpendicular to the track centerline is the Y-axis direction, and the centerline of the pantograph insulator is the zero coordinate line of the X-axis;

[0066] 2) Arrange noise detection points in columns A and B and row C in the far field. Specifically, the detection points in column A are 7.5 meters away from the center line of the track and 1.2 meters high. There are 7 monitoring points arranged along the center line of the track from the center line of the fairing to the pantograph cavity, with each point spaced 1 meter apart; the detection points in column B are 25 meters away from the center line of the track and 1.2 meters high. There are 7 monitoring points arranged along the center line of the track from the front of the fairing to the rear of the pantograph cavity, with each point spaced 2 meters apart; the detection points in row C are located at the center line of the pantograph insulator and 1.2 meters high. Starting from 2.0 meters away from the center line of the track, a detection point is set every 2 meters along the Z axis, with a total of 14 detection points. For the specific distribution diagram of the arranged noise detection points, please refer to Fig.26 The specific three-axis coordinate values ​​of the arranged noise detection points are shown in the following table:

[0067]

[0068] 3) Under the same flow field conditions, the original high-speed train model without the noise reduction system of the present invention (referred to as the original model), the high-speed train model only with the high-speed airflow collector 4 of the present invention (referred to as the airflow collection model), the high-speed train model with the noise reduction system of the present invention (referred to as the invention model), and the high-speed airflow collector 4 of the present invention not being assembled but the jet data on the jet hole surface using the same jet data as the invention model (referred to as the jet model) are simulated and analyzed at each noise detection point, and the noise values ​​are obtained. Figure 27 to Figure 28 The simulation analysis diagram is shown.

[0069] Depend on Fig. 27 It can be seen that at the detection point of column A (i.e., 7.5m away from the center line of the track and 1.2m high), the average noise value of the original model is 93.53711 dB, the average noise value of the airflow collection model is 92.79064 dB, the average noise value of the jet model is 91.4863 dB, and the average noise value of the invented model is 89.57446 dB; in addition, the maximum noise reduction of the airflow collection model is 1.1609 dB, the maximum noise reduction of the jet model is 2.2205 dB, and the maximum noise reduction of the invented model is 4.0889 dB.

[0070] Then by Fig.28It can be seen that at the detection point of column B (i.e., 25m away from the center line of the track and 1.2m high), the average noise value of the original model is 83.30218 dB, the average noise value of the airflow collection model is 82.50097 dB, the average noise value of the jet model is 81.47243 dB, and the average noise value of the invented model is 79.23128 dB; in addition, the maximum noise reduction of the airflow collection model is 0.8611 dB, the maximum noise reduction of the jet model is 2.0453 dB, and the maximum noise reduction of the invented model is 4.1533 dB.

[0071] Then by Fig.29 It can be seen that at the C row detection point (i.e., located at the center line of the pantograph insulator and 1.2 m high), the maximum noise reduction of the airflow collection model is 0.9373 dB, the maximum noise reduction of the jet model is 4.1576 dB, and the maximum noise reduction of the model of the present invention is 6.8114 dB.

[0072] It can be seen from the above simulation analysis results that by adopting the noise reduction system described in the present invention, a significant synergistic noise reduction effect can be achieved. For high-speed trains running at a speed of 400 km / h, the aerodynamic noise of the pantograph cavity can be reduced by 4 to 7 decibels. Compared with the existing technology, it has produced unexpected technical effects and significant progress.

[0073] Finally, it is necessary to point out here that the above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A noise reduction system for a pantograph cavity of a high-speed train, comprising a guide cover arranged at the front end of the pantograph cavity, and a plurality of jet nozzles are arranged on the rear wall surface of the guide cover, characterized in that: It also includes a high-speed airflow collector and a jet air source storage device. The high-speed airflow collector is composed of a plurality of high-speed airflow collecting units arranged on the roof in front of the deflector cover. The high-speed airflow collecting unit is composed of a mounting seat, a drainage pipe and a plurality of airflow collecting covers. The airflow collecting cover is provided with an airflow inlet and an airflow outlet. The plurality of airflow collecting covers are symmetrically fixed on the drainage pipe in a V shape, and the airflow inlet faces the front of the high-speed train. The airflow outlet is connected with the drainage pipe, and the end of the drainage pipe is connected with the air inlet of the jet air source storage device, and the air outlet of the jet air source storage device is connected with the corresponding jet nozzle.

2. The noise reduction system for the pantograph cavity of a high-speed train according to claim 1, characterized in that: The mounting seat is a four-slope roof-like structure, wherein the front and rear slopes are mirror-symmetrical isosceles triangles, and the left and right slopes are mirror-symmetrical isosceles trapezoids. The inner cavity of the mounting seat is a V-shaped groove with an opening facing downward, and a drainage pipe inlet is provided on the front slope, a drainage pipe outlet is provided on the rear slope, and a plurality of airflow collection hood mounting holes are symmetrically provided on the left and right slopes.

3. The noise reduction system for the pantograph cavity of a high-speed train according to claim 1, characterized in that: The airflow collection hood is composed of a spherical hood body and a truncated cone-shaped collection pipe that is larger at the top and smaller at the bottom. The spherical hood body is connected to the truncated cone-shaped collection pipe. The airflow inlet is opened on the spherical hood body, and the airflow outlet is the outlet of the truncated cone-shaped collection pipe.

4. The noise reduction system for the pantograph cavity of a high-speed train according to claim 3, characterized in that: The truncated cone-shaped collecting pipe is fixed on the drainage pipe with its center line tilted at an angle of 45 degrees to the horizontal plane.

5. The noise reduction system for the pantograph cavity of a high-speed train according to claim 1, characterized in that: The airflow inlet section is composed of two mutually perpendicular semicircular sections, wherein the transverse semicircular section is flush with the surface of the mounting seat, and wherein the vertical semicircular section protrudes from the surface of the mounting seat and faces the front of the high-speed train.

6. The noise reduction system for the pantograph cavity of a high-speed train according to claim 1, characterized in that: The jet gas source storage is fixedly arranged in the flow guide cover.

7. The noise reduction system for a high-speed train pantograph cavity according to claim 1, characterized in that: The front wall surface of the jet gas source storage device is in an arc shape, and the rear wall surface of the jet gas source storage device is in an isosceles trapezoidal shape.

8. The noise reduction system for the pantograph cavity of a high-speed train according to claim 1, characterized in that: A plurality of air inlet pipe joints are arranged at intervals on the front wall surface of the jet air source storage device. The air inlet pipe joints pass through the front wall of the air guide cover and can be socketed with the corresponding ends of the drainage pipes. An air outlet corresponding to and connected to the jet nozzles is arranged on the rear wall surface of the jet air source storage device.

9. The noise reduction system for a high-speed train pantograph cavity according to claim 1, characterized in that: The bottom circumference of the mounting seat is provided with an outwardly extending mounting edge A, and the mounting edge A is provided with a bolt hole A for fixed connection with the roof; the bottom circumference of the jet air source storage is provided with an outwardly extending mounting edge B, and the mounting edge B is provided with a bolt hole B for fixed connection with the roof.

10. The noise reduction system for the pantograph cavity of a high-speed train according to claim 1, characterized in that: The jet nozzles are arranged in one row or in multiple rows, and each jet nozzle is installed tilted with the included angle between its center line and the roof plane being an acute angle.

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