CN210882130U

CN210882130U - Obstacle deflector with sawtooth-shaped spoiler at rear end

Info

Publication number: CN210882130U
Application number: CN201921714548.7U
Authority: CN
Inventors: 朱剑月; 王毅刚; 李启良; 陈羽; 夏超; 沈哲; 杨志刚
Original assignee: Tongji University
Current assignee: Tongji University
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-06-30
Anticipated expiration: 2029-10-14

Abstract

The utility model relates to a rear end sets up pilot of zigzag spoiler, including pilot body (1), pilot body (1) is the platykurtic structure, and the appearance profile is the variable cross section streamlined, and the front end is the incident surface, the trailing edge of pilot body (1) sets up zigzag spoiler (2), the leading edge of spoiler (2) is connected with the bottom rear end of pilot body (1), and the trailing edge is along the exhibition to being unsmooth zigzag alternate arrangement in the horizontal plane. Compared with the prior art, the utility model discloses can effectively reduce the production of high-speed train pilot and the regional pneumatic noise of bogie.

Description

Obstacle deflector with sawtooth-shaped spoiler at rear end

Technical Field

The utility model relates to a high-speed train vehicle equips technique and pneumatic noise control technical field, concretely relates to rear end sets up the pilot of zigzag spoiler.

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. According to the strategic deployment of 'one-by-one' and the top-level layout of 'going out of high-speed rail', the operation scale, the technology and the management scale of the high-speed railway construction in China have leaped the top of the world at present.

With the continuous improvement of the running speed of the train, the environmental problems caused by the continuous improvement are increasingly prominent, and the running experience of domestic and foreign high-speed railways shows that the noise problem is most prominent in the environmental pollution of the high-speed train. 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 sources of the high-speed train are a bogie, a pantograph pit, a connecting part of a carriage and the like. According to the contribution amount of the whole vehicle radiated noise, the bogie generates pneumatic noise about 15dB higher than that of a pantograph due to the large number of bogies. In the area of a bogie at the head of a high-speed train, when airflow flows through, violent flow separation and fluid impact are generated, and the airflow becomes a stronger pneumatic noise source. Therefore, the noise in the area of the head bogie is effectively reduced and restrained, the environmental quality along the railway and the noise level in a cab are improved, and the design and production of the high-speed train need to be considered and solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the above problem and providing a can effectively reduce the rear end of the regional aerodynamic noise of high-speed train locomotive bogie and set up the pilot of zigzag spoiler and use thereof.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a high-speed train pilot structure, its rear end sets up the zigzag spoiler, includes the pilot body, the pilot body is the platykurtic structure, and the appearance profile is the variable cross section streamlined, and the front end is the incident surface, the bottom rear end of pilot body sets up a spoiler, the outside edge of spoiler is along the zigzag structure of spanwise equipartition range, and the spoiler adopts to paste or bolted connection mode and this body coupling of pilot.

The utility model discloses install the spoiler at pilot truck body rear edge and be a flat rectangular slab, the front edge is connected bottom pilot truck body, and the rear edge is arranged to being the zigzag along the exhibition in the horizontal plane, and its effect is formed and drops for disturbing locomotive pilot truck rear edge and bogie cabin front edge large scale swirl, reduces pilot truck tail end torrent vortex intensity, transport speed and exhibition to the coherence, suppresses the formation and the interference of unstable disturbance wave to reduce the production of aerodynamic noise.

Further, the internal angle of the tooth tops of the saw teeth of the saw-tooth-shaped structure is 60-90 degrees.

Further, the length of the saw teeth is 30mm-70 mm.

Furthermore, the spoiler is made of alloy or engineering plastics and other materials.

The utility model discloses set up the zigzag spoiler in pilot body bottom rear end, through contained angle, length and the interval isoparametric that changes the sawtooth, carry out the control optimization of the regional pneumatic noise reduction effect of high-speed train locomotive bogie.

The utility model provides an application of pilot of rear end setting zigzag spoiler, this pilot is applied to high-speed train, closely laminates with locomotive nose awl bottom region for reduce the pneumatic noise that pilot and bogie area produced.

The utility model provides a back end sets up the pilot structure of zigzag spoiler, based on bionics design theory, obtain the inspiration from the mechanism of the noiseless flight of owl shape mesh birds, its appearance profile adopts the transition of streamlined variable cross section curve form, the bottom rear end sets up the zigzag spoiler, it forms and drops to disturb locomotive pilot trailing edge and bogie cabin leading edge large scale turbulent vortex, restrain its flow separation and alleviate the fluid interact of its wake and each geometry in the bogie cabin, weaken pilot trailing edge and bogie cabin leading edge geometry solid wall surface pressure pulsation and form, thereby restrain pilot itself and the production of bogie cabin interior structure part aerodynamic noise, effectively improve bogie area aerodynamic noise control effect.

The utility model discloses also can install the regional bogie cabin leading edge of bogie outside the locomotive position to reduce the production and the radiation of this regional aerodynamic noise.

Compared with the prior art, the utility model has the advantages of it is following:

(1) the utility model provides an outline adopts streamlined variable cross section curve form design, the rear end sets up the pilot structure of zigzag spoiler, can alleviate the high-speed train and come the flow and strike with the flow of pilot geometry, and pilot trailing edge shear layer development when restraining the high-speed train operation weakens its surface pressure pulsation and forms, the production of the pneumatic noise of effective control pilot position through combing the flow structure again in order to reduce pilot tail end torrent vortex intensity, transport speed and exhibition to the coherence.

(2) The utility model discloses set up in the zigzag spoiler of pilot unit rear end, can effectively destroy the formation of pilot unit bottom trailing edge position separation vortex and drop, alleviate the fluid interact of its wake and the bogie under-deck geometry, weaken the formation of the solid wall surface pressure pulsation of each structural component in the bogie region, effectively improve the regional pneumatic noise control effect of bogie.

Drawings

FIG. 1 is a schematic structural diagram of a conventional obstacle deflector;

fig. 2 and 3 are schematic structural views of the obstacle deflector with the sawtooth-shaped spoiler at the rear end of the utility model;

FIG. 4 is an enlarged view taken at A in FIG. 3;

FIG. 5 is a schematic structural diagram of a sawtooth spoiler;

FIG. 6 is a side view of the utility model of a high-speed train equipped with a rear obstacle deflector with a sawtooth-shaped spoiler;

FIG. 7 is a front view of the utility model with a rear end provided with a sawtooth spoiler mounted on a high-speed train;

FIG. 8 is an enlarged view at B in FIG. 6;

FIG. 9 is a comparison graph of one third octave test data of far field radiation noise when the internal angle of the sawtooth tip of the present invention is 60 °;

FIG. 10 is a comparison graph of one third octave test data of far field radiation noise when the internal angle of the sawtooth tip of the present invention is 90 °;

fig. 11 is a sound source recognition result obtained by using a far field microphone array of a general obstacle deflector;

fig. 12 is a far field microphone array obtained sound source recognition result of the obstacle deflector with the sawtooth-shaped spoiler at the rear end.

In the figure: 1-a pilot body; 2-a spoiler; 201-saw teeth; 3-vehicle head; 4-a bogie; 5-steel rail.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Examples

Fig. 1 is a schematic structural diagram of a conventional barrier removal device, which does not have a 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 utility model provides a barrier removing device which is provided with a sawtooth-shaped spoiler at the rear end for reducing the pneumatic noise in the steering frame area of the head of the high-speed train, as shown in figures 2-5, the barrier removing device comprises a barrier removing device body 1, the barrier removing device body 1 is of a flat structure, the outline is of a streamline shape with a variable cross section, the front end is a flow-facing surface, the rear end of the bottom of the barrier removing device body 1 is provided with the sawtooth-shaped spoiler 2, the front edge of the spoiler 2 is connected with the rear end of the bottom of the barrier removing device body 1, the rear edge is of a sawtooth-shaped structure which is uniformly arranged in the horizontal plane along the span direction, the tooth tips of the sawteeth 201 are positioned between 60 degrees and 90 degrees, the length of the sawteeth 201 is 30.

As shown in fig. 6-8, the obstacle deflector is mounted at the bottom of the head of the high-speed train, which is marked as the 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 utility model discloses the noise reduction effect has been verified by the test of acoustics wind tunnel, and the test model is 1:3 and installs the high-speed train locomotive model of bogie, and smooth water conservancy diversion section is connected to the rear end to avoid the automobile body afterbody to produce strong whirlpool and drop, thereby induce pneumatic noise. Adopt the utility model discloses the model train of the barrier removal ware that the rear end set up the zigzag spoiler and ordinary barrier removal ware, far field radiation noise third octave test result is more like figure 9 and ordinary barrier removal ware under wind speed 250km/h

FIG. 10 shows that the total far field sound pressure level in the frequency domain below 25kHz decreases by 0.61dB (A) for a 60 tooth angle for the obstacle deflector with a serrated spoiler installed at the rear end of FIG. 9; the far field total sound pressure level is reduced by 0.48db (a) when the serration angle of the obstacle deflector of fig. 10 having the serration spoiler installed at the rear end is 90 °. Analysis figure 9 and figure 10 can find, the rear end sets up the pneumatic noise sound pressure level of the model train of zigzag spoiler pilot and is obviously less than ordinary pilot model train in the frequency channel below 1kHz, has gained good noise reduction.

Fig. 11 and fig. 12 are ordinary pilot and the utility model discloses the rear end sets up the gained sound source recognition result of far field microphone array of the pilot of zigzag spoiler, and wherein the sawtooth tooth angle that the zigzag spoiler pilot was installed to fig. 12 is 60, can discover that the pneumatic noise source area that is provided with the pilot structure of zigzag spoiler obviously reduces, and noise amplitude reduces about 1dB (A), and the regional pneumatic noise of bogie has obtained effective control.

Compare with the used proportion model of experiment, the high-speed train of actual online operation, the reynolds number that flows on every side is higher, the utility model discloses it is better to improve the effect that the separation of barrier removal ware trailing edge flow is gentle with the bogie region receives flow impact and fluid interact between each geometry in the bogie cabin, and the noise reduction effect that produces from this also will be more showing.

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 according to the disclosure of the present invention.

Claims

1. A barrier removing device with a sawtooth-shaped spoiler at the rear end comprises a barrier removing device body (1), wherein the barrier removing device body (1) is of a flat structure, the outline of the barrier removing device body is of a variable cross-section streamline shape, the front end of the barrier removing device body is a flow-facing surface,

the obstacle deflector comprises a barrier deflector body (1), and is characterized in that a spoiler (2) is arranged at the bottom of the rear end of the barrier deflector body (1), the outer edge of the spoiler (2) is of a sawtooth structure, and the sawtooth structure is uniformly arranged along the spanwise direction of the spoiler (2).

2. The barrier remover with the sawtooth-shaped spoiler at the rear end as claimed in claim 1, wherein the spoiler (2) is a flat strip, the front end of the spoiler is connected with the bottom rear edge of the barrier remover body (1), and the rear end of the spoiler is of a sawtooth-shaped structure uniformly distributed in the spanwise direction.

3. The barrier remover with the sawtooth-shaped spoiler at the rear end as claimed in claim 1, wherein the inner angle of the tip of the sawtooth (201) of the sawtooth-shaped structure is 60-90 °.

4. A barrier guard with a rear end provided with a saw-tooth shaped spoiler according to claim 3, wherein the length of the saw-tooth (201) is 30mm-70 mm.

5. The obstacle deflector with the sawtooth-shaped spoiler arranged at the rear end as claimed in claim 4, wherein the pitch of the sawtooth (201) is 40mm-80 mm.

6. The barrier eliminator with the sawtooth-shaped spoiler arranged at the rear end as claimed in claim 1, wherein the spoiler (2) is mounted on the barrier eliminator body (1) by bonding or bolting.

7. The barrier remover with the sawtooth-shaped spoiler at the rear end as claimed in claim 1, wherein the spoiler (2) is made of alloy or engineering plastic material.