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Groove sticking membrane with function of reducing noise and drag and preparation method therefor

A technology of groove and film application in the field of drag reduction and noise reduction groove film and its preparation, which can solve problems such as air resistance, achieve the effects of reducing strength, reducing aerodynamic noise, and improving flow field characteristics

Inactive Publication Date: 2014-09-03
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The groove film technology not only has the effect of reducing drag and noise, but is also easy to implement in engineering. It is expected to be used to solve the problems of air resistance and aerodynamic noise during the operation of high-speed flying objects such as airplanes and high-speed trains.

Method used

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  • Groove sticking membrane with function of reducing noise and drag and preparation method therefor
  • Groove sticking membrane with function of reducing noise and drag and preparation method therefor
  • Groove sticking membrane with function of reducing noise and drag and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The metal profile roller is processed by mechanical processing. Triangular protrusions are evenly distributed on the surface of the profile roll. The height h of the triangular protrusions is 90 μm, the apex angle α is 87°, and the period λ is 510 μm. The metal profile roll and the rubber smooth roll form a pair of rolls, and the triangular groove profile is pressed on the base material of the film self-adhesive by hot pressing. The depth h of the pressed triangular groove morphology unit is 49 μm, the apex angle α is 120°, and the period λ is 510 μm. After removing the anti-adhesive backing paper from the prepared above-mentioned groove film, stick it on the surface of the vehicle along the direction perpendicular to the flow direction according to the requirements of aerodynamics. At a navigation speed of 0.4 times the speed of sound, the friction on the surface of the vehicle can be effectively reduced. Resistance reached 45.6%.

Embodiment 2

[0027] The metal profile roller is processed by mechanical processing. The surface of the profile roll is evenly distributed with triangular protrusions. The height h of the triangular protrusions is 18 μm, the apex angle α is 36°, and the period λ is 35 μm. The metal profile roll and the rubber smooth roll form a pair of rolls, and the heat-pressing method is used to press the spanwise groove film. The depth h of the triangular groove shape unit of the pressed groove film is 10 μm, the apex angle α is 60°, and the period λ is 35 μm. The groove film is pasted on the surface of the vehicle according to the requirements of aerodynamics. At a navigation speed of 0.2 times the speed of sound, the frictional resistance of the navigation surface is reduced by 18.7%, and the aerodynamic noise is reduced by 2.0dB.

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Abstract

The invention relates to a groove sticking membrane with the function of reducing noise and drag and a preparation method therefor, and belongs to the technical field of mechanical engineering surface treatment and hydrodynamics. The groove sticking membrane is characterized in that a groove morphology unit perpendicular to the flow direction is processed on the upper surface of the groove sticking membrane; the lower surface of the groove sticking membrane is provided with a bond layer, and the groove sticking membrane is stuck onto the surface of a navigation body. The groove sticking membrane is stuck onto the surface of the navigation body navigating at a subsonic speed in air dielectric, so that the fluid field characteristic of the near wall of the solid / gas interface can be remarkably improved, and the friction resistance and the aerodynamic noise of the wall can be effectively reduced. The preparation of groove sticking membrane with the function of reducing noise and drag is achieved through the manner of hot-forming. Through the adoption of the technology of the groove sticking membrane, the problems of noise and drag reduction in operation of high-speed navigation bodies such as high-speed trains, commercial aircraft and the like can be solved, and the groove sticking membrane and the preparation method has the characteristics of economy, practicability, and easiness in industrialization.

Description

technical field [0001] The invention relates to a drag-reducing and noise-reducing groove film and a preparation method thereof, which can be used to reduce the surface frictional resistance and aerodynamic noise of a sailing body moving in an air medium, and belongs to the technical fields of mechanical engineering surface treatment technology and fluid dynamics. Background technique [0002] Airplanes, high-speed trains and other high-speed flying objects operating in the air medium mainly consume energy to overcome air resistance during navigation. The resistance is mainly composed of surface friction resistance and pressure difference resistance, among which friction resistance accounts for a large In addition, the appearance of surface frictional resistance will also cause problems such as aerodynamic noise. Therefore, reducing the frictional resistance of the vehicle during its travel will not only help to increase the speed and range of the vehicle, save energy consum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B3/30B32B27/06
Inventor 汪家道豆照良唐啸鸣陈大融
Owner TSINGHUA UNIV
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