Device and method for improving crosswind pneumatic performance of train

Abstract

The invention discloses a device and method for improving train crosswind pneumatic performance in the technical field of train pneumatic performance optimizing.The device comprises a plurality of sets of vertical plates installed at the top of a train in the length direction of the train, and the included angle between each vertical plate and the center line of the train is larger than the included angle between crosswind and the center line of the train; the vertical plate generates a resisting moment for resisting crosswind and upsetting moment; the vertical plate can rotate and be fixed to guarantee that the included angle between the vertical plate and the center line of the train is always larger than the included angle between crosswind and the center line of the train, at the moment, the vertical plate is a negative attack angle relative to the crosswind direction, a low-pressure area is generated in the windward direction of the vertical plate, and a high-pressure area is generated in the leeward direction of the vertical plate. Therefore, the vertical plate generates resistance moment for resisting crosswind and upsetting moment, and the driving safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optimizing the aerodynamic performance of trains, and particularly relates to a device and a method for improving the crosswind aerodynamic performance of trains. Background Art

[0002] When a high-speed train is running under the action of a crosswind, a large aerodynamic force will be generated. The lateral aerodynamic force acting on the train will cause the car body to vibrate relatively violently in the lateral direction. As the running speed of the high-speed train continues to increase, the lift and overturning moment generated during its high-speed operation also gradually increase, and the running attitude of the high-speed train will change. This change in the running attitude may ultimately cause the train to be delayed, derailed, or even overturned, resulting in casualties and economic losses. Summary of the Invention

[0003] The purpose of the present invention is to provide a device and a method for improving the crosswind aerodynamic performance of trains to solve the safety problems caused by the influence of crosswinds on high-speed trains in the prior art.

[0004] To solve the above technical problems, the present invention specifically provides a device for improving the crosswind aerodynamic performance of trains, including multiple groups of vertical plates installed on the top of the train along the length direction of the train. The angle between each vertical plate and the center line of the train is greater than the angle between the crosswind and the center line of the train, so that the vertical plate generates a resistance moment to resist the crosswind and the overturning moment.

[0005] Wherein, the vertical plate is installed on the train through a deflection device, and the deflection device can rotate and fix the vertical plate to ensure that the angle between the vertical plate and the center line of the train is always greater than the angle between the crosswind and the center line of the train.

[0006] As a preferred solution of the present invention, the front side of the vertical plate is set as a continuous arc-shaped corner to improve the wind-breaking effect of the vertical plate during the running of the train.

[0007] As a preferred solution of the present invention, 3 groups of the vertical plates are respectively installed on the head car and the tail car of the train, and 4 groups of the vertical plates are installed on the intermediate cars. The distance between adjacent groups of the vertical plates is 5 - 7m.

[0008] As a preferred solution of the present invention, a groove is provided on the top of the train for installing the deflection device, and a finishing cover is also installed on the top of the train. The outer surface of the finishing cover is flush with the outer surface of the train to reduce air resistance.

[0009] To solve the above technical problems, the present invention further provides a method for improving the crosswind aerodynamic performance of trains, including the following steps:

[0010] Install multiple groups of vertical plates on the train along the length direction of the train;

[0011] Adjust the angle of the vertical plate according to the crosswind direction, so that the angle between each vertical plate and the train center line is always greater than the angle between the crosswind and the train center line, so that the vertical plate can stably generate a resisting moment against the crosswind and the overturning moment.

[0012] The present invention has the following beneficial effects compared with the prior art:

[0013] A plurality of groups of vertical plates are installed on the top of the train along the train length direction. The angle between each vertical plate and the train center line is greater than the angle between the crosswind and the train center line. At this time, the vertical plate is at a negative angle of attack relative to the crosswind direction. A low-pressure area is generated in the windward direction of the vertical plate, and a high-pressure area is generated in the leeward direction, so that the vertical plate generates a resisting moment against the crosswind and the overturning moment, improving the driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0015] Figure 1 It is a three-dimensional schematic diagram of the surface pressure distribution of the train without installing the vertical plate 1 in the embodiment of the present invention;

[0016] Figure 2 It is a three-dimensional schematic diagram of the surface pressure distribution of the train when installing the vertical plate 1 in the embodiment of the present invention;

[0017] Figure 3 It is a front view schematic diagram of the surface pressure distribution of the train without installing the vertical plate 1 in the embodiment of the present invention;

[0018] Figure 4 It is a front view schematic diagram of the surface pressure distribution of the train when installing the vertical plate 1 in the embodiment of the present invention;

[0019] Figure 5 It is a schematic diagram of the surface pressure distribution on the windward side of the leading car when the vertical plate 1 is not installed in the embodiment of the present invention;

[0020] Figure 6 It is a schematic diagram of the surface pressure distribution on the windward side of the leading car when installing the vertical plate 1 in the embodiment of the present invention;

[0021] Figure 7 It is a schematic diagram of the surface pressure distribution on the windward side of the middle car when the vertical plate 1 is not installed in the embodiment of the present invention;

[0022] Figure 8Schematic diagram of the surface pressure distribution on the windward side of the middle car during the installation of the upright plate 1 in the embodiment of the present invention;

[0023] Figure 9 Schematic diagram of the surface pressure distribution on the windward side of the tail car without installing the upright plate 1 in the embodiment of the present invention;

[0024] Figure 10 Schematic diagram of the surface pressure distribution on the windward side of the tail car during the installation of the upright plate 1 in the embodiment of the present invention;

[0025] Figure 11 Schematic diagram of the surface pressure distribution on the leeward side of the head car without installing the upright plate 1 in the embodiment of the present invention;

[0026] Figure 12 Schematic diagram of the surface pressure distribution on the leeward side of the head car during the installation of the upright plate 1 in the embodiment of the present invention;

[0027] Figure 13 Schematic diagram of the surface pressure distribution on the leeward side of the middle car without installing the upright plate 1 in the embodiment of the present invention;

[0028] Figure 14 Schematic diagram of the surface pressure distribution on the leeward side of the middle car during the installation of the upright plate 1 in the embodiment of the present invention;

[0029] Figure 15 Schematic diagram of the surface pressure distribution on the leeward side of the tail car without installing the upright plate 1 in the embodiment of the present invention;

[0030] Figure 16 Schematic diagram of the surface pressure distribution on the leeward side of the tail car during the installation of the upright plate 1 in the embodiment of the present invention;

[0031] Figure 17 Schematic diagram of the size relationship between the included angle between the upright plate 1 and the train center line and the included angle between the crosswind and the train center line in the embodiment of the present invention;

[0032] Figure 18 Schematic diagram of the overturning moment and the resistance moment in the embodiment of the present invention;

[0033] Figure 19 Schematic diagram when the sorting cover is closed in the embodiment of the present invention;

[0034] Figure 20 Schematic diagram when the sorting cover is opened in the embodiment of the present invention.

[0035] The reference numerals in the figure are respectively represented as follows:

[0036] 1 - upright plate, 2 - groove, 3 - deflection device, 4 - sorting cover. Detailed implementation manners

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] The present invention specifically provides a device for improving the aerodynamic performance of a train in crosswind, including multiple groups of vertical plates 1 installed on the top of the train along the length direction of the train. The included angle between each vertical plate 1 and the center line of the train is greater than the included angle between the crosswind and the center line of the train. At this time, the vertical plate 1 has a negative angle of attack relative to the crosswind direction. The vertical plate 1 generates a low-pressure area in the windward direction and a high-pressure area in the leeward direction, so as to enable the vertical plate 1 to generate a resistance moment against the crosswind and overturning moment.

[0039] Among them, the vertical plate 1 is installed on the train through a deflection device 3. The deflection device 3 can rotate and fix the vertical plate 1 to ensure that the included angle between the vertical plate 1 and the center line of the train is always greater than the included angle between the crosswind and the center line of the train.

[0040] Further, the front side of the vertical plate 1 is set as a continuous arc-shaped corner to improve the wind-breaking effect of the vertical plate 1 during the train's travel.

[0041] Further, from the analysis of the technical standard TB10621-2014 for high-speed railway engineering construction in China at present, the installation and layout plan within the high-speed railway clearance in China at this stage is as follows: 3 groups of vertical plates 1 are installed on the head car and the tail car of the train respectively, and 4 groups of vertical plates 1 are installed on the intermediate cars. The distance between adjacent groups of vertical plates 1 is 5-7m.

[0042] Optionally, the vertical plate 1 is made of aluminum alloy material, with an overall length of 950mm, a width of 680mm, and a maximum thickness of 30mm.

[0043] Further, a groove 2 is provided on the top of the train for installing the deflection device 3. A finishing cover 4 is also installed on the top of the train. The outer surface of the finishing cover 4 is flush with the outer surface of the train to reduce air resistance.

[0044] It should be noted that the finishing cover 4 is in a normally closed state and is only opened during maintenance or installation.

[0045] Optionally, the deflection device 3 can be set as a reduction motor.

[0046] The present invention further provides a method for improving the aerodynamic performance of a train in crosswind, including the following steps: installing multiple groups of vertical plates 1 on the train along the length direction of the train;

[0047] Adjust the angle of the vertical plate 1 according to the crosswind direction, so that the angle between each vertical plate 1 and the train center line is always greater than the angle between the crosswind and the train center line, so that the vertical plate 1 can stably generate a resistance moment against the crosswind and the overturning moment.

[0048] Aerodynamic evaluation can be carried out on the train before and after installing the deflectable vertical plate 1 to judge the effect of the vertical plate 1 on improving the crosswind aerodynamic performance of the train. The steps are as follows:

[0049] Set the train running speed and the crosswind speed;

[0050] Create a geometric model: Use CAD software to create a geometric model of the high-speed train and the deflectable vertical plate 1 device;

[0051] Mesh generation: Divide the geometric model into multiple small units (meshes) for numerical calculation;

[0052] Run the calculation: Select the solution algorithm and set the solution parameters, and use computational fluid dynamics (CFD) software for numerical solution;

[0053] Extract the results: Extract the key parameters from the calculation results, and use a visualization tool to display the results in a graphical form for easy analysis.

[0054] According to the basic theory of aerodynamics, the flow field calculation method adopts the three-dimensional steady compressible Reynolds-averaged N-S equation based on the cell-centered finite volume method, the spatial discretization format adopts the Roe format, and the time discretization adopts the LU-SGS discretization method.

[0055] Table 1 Comparison of lateral aerodynamic forces before and after installing the vertical plate 1

[0056]

[0057] Table 2 Comparison of overturning moments before and after installing the vertical plate 1

[0058]

[0059] It can be seen from Table 1 and Table 2 that the deflectable vertical plate 1 device in the present invention can effectively reduce the air lift of the bogie compartments of the head car and the middle car. After installing this device, the lateral aerodynamic force and the overturning moment of the whole vehicle are reduced by 51.25% and 46.17% respectively, and the reduction is very obvious, which fully demonstrates the effectiveness of this device / method. The vehicle with the largest change is the tail car, followed by the middle car and the head car.

[0060] Control mechanism: In the accompanying drawings, there is a comparison schematic diagram of the surface pressure distribution and cross-sectional velocity distribution with or without the installation of the non-deflecting vertical plate 1 device under strong wind load conditions (train speed of 400 km / h and crosswind of 20 m / s). It can be seen that in the presence of a crosswind, a low-pressure area is generated in the windward direction of the vertical plate 1 device, and a high-pressure area is generated in the leeward direction, causing the vertical plate 1 to generate a resistance moment against the crosswind, thereby reducing the additional lateral force and overturning moment brought by the crosswind.

[0061] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the essence and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims

1. A device for improving the aerodynamic performance of a train against crosswinds, characterized in that: it includes multiple groups of vertical plates (1) installed on the top of the train along the length direction of the train, and the angle between each vertical plate (1) and the center line of the train is greater than the angle between the crosswind and the center line of the train, so that the vertical plate (1) generates a resisting moment against the crosswind and the overturning moment; wherein, the vertical plate (1) is installed on the train through a deflection device (3), and the deflection device (3) can rotate and fix the vertical plate (1) to ensure that the angle between the vertical plate (1) and the center line of the train is always greater than the angle between the crosswind and the center line of the train.

2. The device for improving the aerodynamic performance of a train against crosswinds according to claim 1, characterized in that: the front side of the vertical plate (1) is set as a continuous arc-shaped corner to improve the wind-breaking effect of the vertical plate (1) during the running of the train.

3. The device for improving the aerodynamic performance of a train against crosswinds according to claim 1, characterized in that: 3 groups of the vertical plates (1) are respectively installed on the head car and the tail car of the train, and 4 groups of the vertical plates (1) are installed on the intermediate cars, and the distance between adjacent groups of the vertical plates (1) is 5 - 7m.

4. The device for improving the aerodynamic performance of a train against crosswinds according to claim 1, characterized in that: a groove (2) is provided on the top of the train for installing the deflection device (3), and a finishing cover (4) is also installed on the top of the train, and the outer surface of the finishing cover (4) is flush with the outer surface of the train to reduce air resistance.

5. A method for improving the aerodynamic performance of a train in crosswind, characterized in that, It includes the following steps: Install multiple groups of vertical plates (1) on the train along the length direction of the train; Adjust the angle of the vertical plate (1) according to the direction of the crosswind, so that the angle between each vertical plate (1) and the center line of the train is always greater than the angle between the crosswind and the center line of the train, so that the vertical plate (1) can stably generate a resisting moment against the crosswind and the overturning moment.

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