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Slat noise reduction device with arc-shaped bulge at tip end of lower wing surface

An arc-shaped convex and cutting-edge technology, applied in the aviation field, can solve the problems of unreasonable noise reduction effect and poor maintainability in the later stage of engineering operability, so as to reduce vortex-vortex interference and merger phenomenon and achieve good noise reduction effect , The effect of facilitating later maintenance

Pending Publication Date: 2022-07-22
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

Although this invention has a certain noise reduction effect, its engineering operability and later maintainability are poor; at the same time, the energy near the slat cavity is mainly concentrated in the shear layer, and the noise reduction effect of controlling the vortex structure in the recirculation zone is not relative. considerable

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  • Slat noise reduction device with arc-shaped bulge at tip end of lower wing surface
  • Slat noise reduction device with arc-shaped bulge at tip end of lower wing surface
  • Slat noise reduction device with arc-shaped bulge at tip end of lower wing surface

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Active flow control methods often require energy intake, and there are also problems with flow control; common passive flow control techniques have problems such as affecting lift performance more or less, and poor achievability. In the present invention, it is hoped that by carrying out a small deformation design on the main body of the existing slat, the air flow can be separated in advance to form a turbulent shear layer, and the mixing effect of the external air flow can be reduced by changing the movement trajectory of the shear layer, so as to change the upper vortex of the shear layer. The law of structural development and evolution, the purpose of reducing the energy of the collision zone and effectively reducing noise.

[0024] In order to ensure that the lift performance of the lift-enhancing device is not affected, the present inventio...

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Abstract

The invention discloses a slat noise reduction device with an arc-shaped bulge at the tip end of a lower wing surface. The slat noise reduction device comprises a leading edge slat, a main wing, a trailing edge flap and a semi-arc bulge device, the leading edge slat, the main wing and the trailing edge flap form a three-section wing structure; the semi-arc-shaped protruding devices are arranged at the positions, away from the tip end of the leading edge slat 1 by 0.5% of the airfoil chord length, of the leading edge slat, the diameter of the semi-arc-shaped protruding devices is 0.3% of the airfoil chord length, and the semi-arc-shaped protruding devices are distributed in the spanwise direction. The arc-shaped protrusions on the front edge of the device can separate airflow in advance, a small-area back pressure area is formed behind the arc-shaped protrusions, vortex-vortex interference and merging phenomena on a shear layer are weakened, and a good noise reduction effect can be achieved.

Description

technical field [0001] The invention belongs to the field of aviation technology, and in particular relates to a slat noise reduction device with an arc-shaped protrusion at the tip of a lower wing surface. Background technique [0002] The increasingly serious aircraft noise problem runs counter to the construction concept of green aviation. The International Civil Aviation Organization has proposed more and more stringent airworthiness standards to limit civil aviation noise, in order to develop modern civil aviation aircraft in the direction of environmental protection, quietness and comfort. Combined with the lift-enhancing effect and structural design, modern large-scale civil airliners mostly use a three-segment wing configuration to achieve lift-enhancing purposes. figure 1 The three-section wing configuration is in the tightened state of the cruise stage, and its structure consists of a leading edge slat 1, a main wing 2 and a trailing edge flap 3. [0003] During t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64C21/00B64C9/22
CPCB64C21/00B64C9/22B64C2230/14
Inventor 张伟伟张巧高传强王红建
Owner NORTHWESTERN POLYTECHNICAL UNIV
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