A method for reducing drag of a shark-skin-like drag-reducing wing

A technology that imitates sharks and wings. It is applied in the directions of wings, heat-reducing structures, and aircraft parts. It can solve problems such as flight resistance, and achieve the effect of large recoverable strain and reduced resistance.

Active Publication Date: 2017-08-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the eddy current on the surface of the aircraft constitutes flight resistance, and propose a drag-reducing wing imitating shark skin

Method used

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  • A method for reducing drag of a shark-skin-like drag-reducing wing
  • A method for reducing drag of a shark-skin-like drag-reducing wing
  • A method for reducing drag of a shark-skin-like drag-reducing wing

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specific Embodiment approach 1

[0020] The drag-reducing wing of imitation shark skin of the present embodiment, combines figure 1 As shown, its composition includes: wings 2 respectively installed on both sides of the fuselage 1, a group of speed sensors 3 are installed on the surface of the fuselage 1, a skin layer 4 is attached to the surface of each wing 2, and the surface of the skin layer 4 has A group of arc-shaped protruding ribs 5, grooves 6 are formed between two adjacent protruding ribs 5; and the protruding ribs 5 are wound on the surface of the wing 2, and the cross section of each protruding rib 5 is elliptical shape or circle, the area of ​​each raised rib 5 cross section is about 245-628mm 2 , the distance between the midpoints of the ellipse or circle where the cross-sections of two adjacent raised ribs 5 are located is 25-40mm;

[0021] Wherein, the skin layer 4 is composed of a shape-memory polymer matrix 7 and an elastic fiber body 8 disposed inside the shape-memory polymer matrix 7 .

specific Embodiment approach 2

[0023] The difference from Embodiment 1 is that in the sharkskin-like drag-reducing wing of this embodiment, the angle between the plane of the arc formed by each raised rib 5 and the central axis of the fuselage 1 is 20-80° .

specific Embodiment approach 3

[0025] Different from Embodiment 1 or Embodiment 2, in the sharkskin-like drag-reducing wing of this embodiment, the elastic fiber body 8 disposed inside the shape-memory polymer matrix 7 is in the shape of a spiral filament.

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Abstract

The invention provides a sharkskin-imitating resistance-reducing wing and belongs to the field of resistance-reducing wings. By the adoption of the sharkskin-imitating resistance-reducing wing, the problem that flying resistance is formed by vortexes on the surface of a plane is solved. According to the sharkskin-imitating resistance-reducing wing, a speed sensor (3) is installed on the surface of a plane body (1); a skin layer (4) adheres to the surface of a wing body (2); a set of arc-shaped protruding ribs (5) are arranged on the surface of the skin layer (4); and a groove (6) is formed between every two adjacent protruding ribs (5). A resistance reducing method of the sharkskin-imitating resistance-reducing wing comprises the steps that if the resistance measured by the speed sensor (3) is excessively large, the skin layer (4) is heated so that the temperature of the skin layer (4) can be increased, and a sharkskin-imitating rib structure is formed by means of the tensile force of a variable-trailing-edge wing body or a variable-chord wing body. According to the sharkskin-imitating resistance-reducing wing, the flow field characteristics around the plane are changed through the sharkskin-imitating rib structure, so that the resistance borne by the plane in the flying process is reduced.

Description

technical field [0001] The invention relates to a drag reduction method of a shark skin-like drag reduction wing. Background technique [0002] The natural world is full of organisms with structural, material and surface properties that can be exploited for commercial use. Biomimicry, as the name suggests, is to study the characteristics of plants and animals in nature and then make inspired designs. By studying and understanding the mechanism of these natural phenomena, it is possible for us to replicate these phenomena for our needs. Sharks that imitate fast swimming grow rib-like structures along the direction of flow, which are thought to reduce frictional resistance in turbulent flow fields. The structure copied and improved on the basis of the shark rib structure will be researched and applied, and it is found that it can provide a maximum drag reduction rate of nearly 10%. [0003] In fact, when the fluid flows through the surface of the object, the surface layer w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B64C3/18B64C3/36B64C3/26
CPCB64C3/187B64C3/26B64C3/36
Inventor 孙健曹鹏宇刘彦菊冷劲松
Owner HARBIN INST OF TECH
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