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High Speed ​​Surface Drag Reduction Device

A drag reduction device, high-speed technology, applied in the direction of mechanical equipment, fluid flow, etc., can solve the problems of high energy consumption, large flow resistance, etc., to achieve the effect of reducing flow resistance, reducing energy consumption, and strong practicability

Active Publication Date: 2016-12-28
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a high-speed surface drag reducing device to solve the technical problems of large flow resistance and high energy consumption caused by the large speed difference between the moving object and the surrounding fluid in the existing application , to achieve the important requirement of drag reduction through a simple and easy device, wide range of adaptation, simple and easy structure, and good control of operating parameters based on sufficient theoretical research makes this technology have a good practical prospect

Method used

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  • High Speed ​​Surface Drag Reduction Device
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  • High Speed ​​Surface Drag Reduction Device

Examples

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Embodiment 1

[0031] Such as figure 1 As shown, this embodiment relates to a high-speed surface drag reduction device, the drag reduction device is composed of several drag reduction units 6, and each drag reduction unit 6 includes: a rotating body 1, a bearing 2, a wheel shaft 3, and a fixed bracket 4 And the flexible connection device 5, the rotating body 1 in this embodiment is a cylindrical drum, the rotating body 1 is connected with the wheel shaft 3 through the bearing 2, the wheel shaft 3 is installed on the surface of the object through the fixed bracket 4, and the fixed bracket between the connected drag reducing units 4 are connected by a flexible connecting device 5.

[0032] In the specific implementation of the present invention, the ideal drag reduction effect depends on the setting of operating parameters, which include: the size of the wheel axle, the distance between the wheel axles, and how to arrange the space position of the wheel axles. These core parameters depend on ...

Embodiment 2

[0037] Such as image 3 , Figure 4 As shown, this embodiment relates to a high-speed surface drag reduction device, and the drag reduction device is composed of several drag reduction units 6, and each drag reduction unit 6 includes: a rotating body 1, a wheel shaft 3, and a bearing 2. In this embodiment, The rotating body 1 is a roller or a ball, and the rotating body 1 is connected with the wheel shaft 3 through a bearing, and the wheel shaft 3 is arranged on the surface 11 of the object.

[0038] When the object moves at a high speed, the surrounding fluid 15 will generate a large shear force on the surface 11 of the object due to its viscosity, thereby driving the rotating body 1 to rotate. It can be seen from the force analysis that the rotation of the rotating body 1 reduces the relative velocity between the moving body and the surrounding fluid 15, thereby reducing flow resistance and reducing energy consumption.

[0039] Such as image 3 , Figure 4 As shown, it i...

Embodiment 3

[0041] In this embodiment, the device with the same structure as that of Embodiment 1 or Embodiment 2 above is used on the surface of the ship immersed in the water body.

[0042] Usually, the speed of the ship is not very high, but because the dynamic viscosity coefficient of water is much larger than that of air, the drag reducing effect of the drag reducing structure of the present invention is very obvious. In this embodiment, the rotating body may adopt a roller structure on a relatively smooth surface, and may adopt a roller structure on a part of the relatively curved water-immersed surface.

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Abstract

The invention relates to a high-speed surface drag reduction device, which is used to reduce the movement resistance of objects. It is composed of several drag reduction units. Each drag reduction unit includes: a wheel shaft, a bearing, and a rotating body. The rotating body is connected with the bearing, and the bearing is arranged through the wheel shaft. on the surface of the object. The structure of the device is flexible and can adapt to different geometric surfaces. The method can obviously reduce the relative speed difference between the moving object and the surrounding fluid, has the advantages of reducing the flow resistance of the moving object, reducing energy consumption and having a wide range of applications.

Description

technical field [0001] The invention relates to the field of fluid dynamics, in particular to a high-speed surface drag reducing device. Background technique [0002] In fluids, such as air or water, affected by the viscosity of the fluid, there is a large speed difference between the surface of a flying or moving object and the surrounding fluid. This relative motion will cause the fluid on the surface of the object to form a large velocity gradient, resulting in high flow friction resistance and great energy dissipation. For example, the kinetic energy loss of a missile flying in the atmosphere due to the aerodynamics will cause huge friction on the surface of the aircraft, resulting in severe ablation at high temperature. Therefore, it is very meaningful to reduce the relative velocity difference between the moving object and the surrounding fluid, reduce the surface velocity gradient, and solve the problems of large flow resistance and high energy consumption caused by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15D1/00
Inventor 王利坡张强
Owner SHANGHAI JIAOTONG UNIV
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