CN113859296A - Obstacle deflector with passive turbulent flow structure and application thereof - Google Patents
Obstacle deflector with passive turbulent flow structure and application thereof Download PDFInfo
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- CN113859296A CN113859296A CN202111246877.5A CN202111246877A CN113859296A CN 113859296 A CN113859296 A CN 113859296A CN 202111246877 A CN202111246877 A CN 202111246877A CN 113859296 A CN113859296 A CN 113859296A
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- 230000004888 barrier function Effects 0.000 claims abstract description 31
- 239000000956 alloy Substances 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 230000003993 interaction Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 230000005284 excitation Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F19/00—Wheel guards; Bumpers; Obstruction removers or the like
- B61F19/06—Nets, catchers, or the like for catching obstacles or removing them from the track
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
The invention relates to a barrier remover with a passive turbulence structure and application thereof, and the barrier remover comprises a barrier remover body, wherein the barrier remover body is of a flat streamline structure, the rear end of the bottom of the barrier remover body is provided with the passive turbulence structure, the profile of the turbulence structure is cylindrical and is vertical to the airflow direction, and the ratio of the distance between a turbulence generator and the flat end surface of the rear end of the barrier remover body to the diameter of the turbulence generator is less than 1. Compared with the prior art, the invention changes the angle of the air flow entering the bogie cabin by utilizing the interaction of the cylindrical wake flow and the shear layer, and effectively reduces the pneumatic noise generated in the bogie area of the high-speed train.
Description
Technical Field
The invention relates to the technical field of high-speed train vehicle equipment and pneumatic noise control, in particular to a pilot with a passive turbulent flow structure and application thereof.
Background
The high-speed railway is developed rapidly in various countries in the world due to the advantages of safe, reliable, comfortable and convenient transportation service characteristics, high efficiency, energy conservation and the like. In order to better promote the development of the transportation industry, greatly improve the transportation efficiency and solve the railway transportation pressure in the peak time of passenger flow, the railway high-speed has become an important trend of the development of the current world.
As the train operation speed is continuously increased, the environmental problems caused by the increase are increasingly prominent. A great deal of practical operation experience shows that the noise problem is most prominent in the environmental pollution of high-speed trains. When the running speed of the high-speed train exceeds 300km/h, the aerodynamic noise exceeds the wheel rail rolling noise and the traction noise to occupy a dominant position. The main pneumatic noise source of the high-speed train is the junction of a bogie, a pantograph and a carriage. Due to the large number of bogies, far field aerodynamic noise generated by the bogies is about 15dB higher than that generated by the pantograph. The acoustic wind tunnel experiment results show that the head car bogie area is the largest aerodynamic noise source in all bogie areas. The train with the speed of 350km to 380km through aerodynamic noise transmits air sound to occupy the main position of the noise in the train, and the air sound in the bogie area is also the most main contribution source of the noise in the train. Therefore, the noise in the area of the head bogie is effectively reduced and inhibited, the environmental quality along the railway and the noise level in the train are improved, and the design and production of the high-speed train need to be considered and solved.
Patent 110070850A discloses streamlined STREAMING pilot actuated device and uses thereof, including pilot actuated device body, the pilot actuated device body is flat plate column structure, and the appearance profile is the variable cross section streamlined, and the front end is the incident surface, the center department of incident surface opens there is a class mouth, the inside class passageway that flows that is equipped with of pilot actuated device body sets up the mouth that releases on the rear end face of pilot actuated device body, the class mouth guide high velocity air stream flows in the class passageway and by the mouth that releases flows out, the class passageway that flows makes high velocity air stream from preceding backward, from interior to exterior slant downwards flow out release mouth. Patent CN111071272A discloses a barrier removing device that bottom rear end set up pit, including the barrier removing device body, the barrier removing device body is the platykurtic structure, and the appearance profile is the cross section of becoming streamlined, and the front end is the incident surface, the bottom rear end of barrier removing device body sets up the multirow pit. The above-described disclosed structure of the barrier remover has a certain effect of controlling aerodynamic noise, and the cross-flow type barrier remover reduces broadband noise by directing the front air flow to both sides, but has a small effect of suppressing peak noise because it has a limited effect of controlling a shear layer. The pit pilot reduces peak noise by adding disturbance to the shear layer, but greatly increases broadband noise of 1 kHz-5 kHz. And the two are mainly used for analyzing the noise reduction effect of far-field noise, and the analysis on the near-field noise in the cabin is less.
Disclosure of Invention
The invention aims to solve the problems and provides a fault eliminator with a passive turbulence structure, which can effectively reduce the aerodynamic noise of a bogie area of a head of a high-speed train, and an application thereof.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a arrange barrier ware with passive vortex structure, includes the barrier ware body of arranging, the barrier ware body of arranging is flat streamlined structure, and the appearance profile is the variable cross section streamlined, and the front end is the windward side, and the rear end is the flush end face, the rear end bottom of barrier ware body sets up passive vortex structure, passive vortex structure is the protrusion the sand grip column structure that the barrier ware body set up, and with the flush end face of rear end of barrier ware body parallels, and length direction is mutually perpendicular with the air current direction.
The turbulence structure arranged at the rear end of the bottom of the obstacle deflector is used for changing the angle of airflow entering the bogie cabin, reducing the excitation on the acoustic mode of the bogie cavity and reducing the impact of the shear layer on the rear wall of the bogie cabin, thereby reducing the generation of pneumatic noise.
Further, the passive turbulence structure is cylindrical.
Further, the diameter (D) of the cylinder is 45-55mm, the smaller the diameter, the smaller the peak noise reduction amplitude, but the larger diameter introduces higher peak noise energy of the cylinder, and therefore 50mm is preferred.
Furthermore, passive vortex structure is close to the setting of pilot truck body rear end, with the rear end flush end face distance of pilot truck body is G, in order to make the cylinder wake can bring the shear layer that the pilot truck drops into the below, should satisfy G/D <1, D is cylindrical diameter, and the G scope is 30 ~ 40mm, preferred 35 mm.
Further, the width of passive vortex structure with the pilot body afterbody width equals, is about 3200 mm.
Furthermore, the passive turbulence structure is installed on the obstacle deflector body through a multipoint support mode.
Furthermore, the passive turbulence structure is made of alloy materials and is of a solid structure.
The application of the obstacle eliminator of the passive turbulent flow structure is applied to a high-speed train and used for reducing pneumatic noise generated in a bogie area.
The pilot is closely attached to the bottom area of the nose cone of the head of the high-speed train.
According to the obstacle deflector with the passive turbulence structure, the appearance outline adopts streamline variable cross-section curve type transition, incoming flow at the bottom of a locomotive is guided to two sides of the obstacle deflector, the cylindrical passive turbulence structure is arranged at the rear end of the bottom, the angle of air flow entering the obstacle deflector can be changed through the interaction of cylindrical wake flow and a shearing layer, the excitation of the trailing edge of the obstacle deflector and the shearing layer at the front edge of a bogie cabin on the sound mode of the bogie cabin is inhibited, the impact of the shearing layer on the rear wall of the bogie cabin is reduced, the peak noise in the bogie cabin and the broadband noise of the rear wall of the bogie cabin in the operation process are reduced, and the aerodynamic noise control effect of a bogie area is effectively improved.
The invention can also be arranged at the front edge of the bogie cabin in the bogie area outside the locomotive so as to reduce the generation and radiation of aerodynamic noise in the area.
Compared with the prior art, the invention has the following advantages:
(1) the obstacle deflector with the passive turbulence structure can effectively change the angle of the entering airflow entering the bogie cabin, thereby reducing the excitation of the airflow to the acoustic mode inside the bogie cabin and effectively reducing the peak noise of the top and the rear wall of the bogie cabin.
(2) The obstacle deflector with the passive turbulence structure can reduce the impact of airflow on the rear wall of the bogie cabin and effectively reduce the broadband noise generated by the rear wall of the bogie cabin.
Drawings
Fig. 1 is a schematic structural view (front view) of a general barrier remover;
fig. 2 is a schematic structural view (bottom view) of a general barrier remover;
FIG. 3 is a schematic view of a pilot with a passive spoiler structure according to the present invention;
FIG. 4 is a side view of a barrier with a passive spoiler structure according to the present invention mounted on a high speed train;
FIG. 5 is a comparison graph of one-third octave test data of noise at the top of a bogie cabin of the pilot with a passive spoiler structure according to the present invention;
FIG. 6 is a comparison graph of one-third octave test data for noise on the rear wall of a bogie cabin of the obstacle deflector with a passive spoiler structure according to the present invention;
in the figure: 1-a pilot body; 2-a passive turbulence structure; 3-vehicle head; 4-a bogie; 5-steel rail.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Fig. 1-2 are schematic structural views of a conventional barrier removing device, which does not have the function of reducing aerodynamic noise in a bogie area of a head of a high-speed train.
In order to effectively control the pneumatic noise generated by the operation of a high-speed train, the invention provides a fault removing device with a passive turbulent flow structure for reducing the pneumatic noise in a bogie area of a head of the high-speed train, as shown in figures 3-4, the fault removing device comprises a fault removing device body 1, the fault removing device body 1 is of a flat structure, the outline is of a variable cross-section streamline shape, the front end is a flow-facing surface, the rear end of the bottom of the fault removing device body 1 is provided with a cylindrical turbulent flow structure 2, the turbulent flow structure is hung at the rear end of the bottom of the fault removing device, the distance between the turbulent flow structure and the bottom of the fault removing device is 35mm, the diameter of a cylinder is 50mm, and the width of the turbulent flow structure is 3200mm equal to the width of the tail of the fault removing device.
As shown in fig. 4, the obstacle deflector is mounted at the bottom of the head of the high-speed train, which is marked with a head 3, a bogie 4 and a steel rail 5, and is closely attached to the bottom area of the nose cone of the head of the high-speed train.
The noise reduction effect of the invention is verified by an acoustic wind tunnel test, and the test model is a 1:20 high-speed train head model provided with bogies. By adopting the train model of the obstacle deflector with the passive turbulence structure and the common obstacle deflector, the test results of one third octave of noise of the top and the rear wall in the bogie cabin at the wind speed of 40m/s are compared as shown in fig. 5 and 6, and the peak noise of the top of the bogie cabin provided with the obstacle deflector with the passive turbulence structure is reduced to 105.6dB (A) from 121.2dB (A) for the peak noise of a 630Hz frequency band, and the obstacle deflector with the passive turbulence structure is reduced to 5-7 dB (A) for each frequency band of 500Hz-10kHz for the position of the rear wall of the bogie cabin, and the total sound pressure level is reduced to 6.2dB (A), so that a good noise reduction effect is obtained.
Compared with a proportional model used in a test, the peripheral flowing Reynolds number of a high-speed train which actually runs on line is higher, the effect of improving the flow separation of the rear edge of the obstacle deflector and the effect of buffering the flow impact on a bogie area and the fluid interaction between various geometric bodies in a bogie cabin can be better, the noise reduction effect generated by the method is more obvious, and the peak noise and the broadband noise felt by passengers at the top of the bogie cabin in the train can be effectively reduced.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The utility model provides a arrange barrier ware with passive vortex structure, includes barrier ware body (1), barrier ware body (1) is flat streamlined structure, and the appearance profile is the variable cross section streamlined, and the front end is the windward side, and the rear end is the flush end face, its characterized in that, the rear end bottom of barrier ware body (1) sets up passive vortex structure (2), passive vortex structure (2) are the protrusion the sand grip column structure that barrier ware body (1) set up, and with the flat end face of rear end of barrier ware body (1) parallels, and length direction is mutually perpendicular with the air current direction.
2. The obstacle deflector with the passive turbulence structure as recited in claim 1, characterized in that the passive turbulence structure (2) is arranged close to the rear end of the obstacle deflector body (1) and is 30-40mm away from the flat end face of the rear end of the obstacle deflector body (1).
3. The obstacle deflector with a passive spoiler structure according to claim 1, characterized in that the passive spoiler structure (2) is cylindrical.
4. The obstacle deflector with a passive spoiler structure according to claim 3, wherein the diameter of the cylinder is 45-55 mm.
5. The obstacle deflector with the passive spoiler structure according to claim 1, wherein the width of the passive spoiler structure (2) is equal to the width of the tail of the obstacle deflector body.
6. The obstacle deflector with a passive spoiler structure according to claim 5, characterized in that the width of the passive spoiler structure (2) is 3100 and 3300 mm.
7. The obstacle deflector with the passive spoiler structure according to claim 1, wherein the passive spoiler structure (2) is mounted on the obstacle deflector body (1) through a multipoint support.
8. The obstacle deflector with the passive turbulent flow structure as claimed in claim 1, wherein the passive turbulent flow structure (2) is made of alloy material and is a solid structure.
9. Use of a barrier with a passive spoiler structure according to any one of claims 1-8 for a high speed train for reducing aerodynamic noise generated in the bogie area.
10. The use of a barrier deflector with a passive spoiler structure as claimed in claim 9, wherein the barrier deflector is in close proximity to the nose cone bottom region of the nose of a high speed train.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111246877.5A CN113859296B (en) | 2021-10-26 | 2021-10-26 | Barrier with passive turbulence structure and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111246877.5A CN113859296B (en) | 2021-10-26 | 2021-10-26 | Barrier with passive turbulence structure and application thereof |
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| CN113859296A true CN113859296A (en) | 2021-12-31 |
| CN113859296B CN113859296B (en) | 2024-03-26 |
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| CN113147821A (en) * | 2021-05-31 | 2021-07-23 | 中车青岛四方机车车辆股份有限公司 | Obstacle removing device, vehicle body and rail vehicle |
-
2021
- 2021-10-26 CN CN202111246877.5A patent/CN113859296B/en active Active
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| CN113859296B (en) | 2024-03-26 |
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