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Aircraft three-dimensional surface flow distribution wind tunnel measurement method

A three-dimensional surface, flow distribution technology, applied in the direction of measuring devices, testing of machine/structural components, instruments, etc., can solve problems such as low production efficiency, and achieve the effect of solving low production efficiency, improving test efficiency and shortening test cycle.

Active Publication Date: 2018-08-14
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

[0006] The technical problem solved by the present invention is: to overcome the deficiencies in the prior art, a wind tunnel measurement method for three-dimensional surface flow distribution of aircraft is proposed, and stereo vision technology is used to effectively solve the problem of three-dimensional measurement and low production efficiency, and provide Technical Support

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Embodiment Construction

[0034] Such as figure 1 Shown, a kind of aircraft three-dimensional surface flow distribution measurement method that the present invention proposes, the steps are as follows:

[0035] (1) Spray sensitive coatings on the wind tunnel test model, and set up multiple observation cameras. The observation cameras are set outside the observation window of the wind tunnel or inside the wind tunnel. Used to observe the upper surface, lower surface and side of the model, and arrange the light source to excite the sensitive coating next to the observation camera; such as figure 2 As shown, 1 is the wind tunnel test model, 2 is the visual platform, 3 is the camera, and 4 is the light source.

[0036] The sensitive coating refers to a special material whose optical properties are sensitive to certain physical parameters, such as a temperature-sensitive paint coating. When its temperature changes, its light intensity excited by ultraviolet light will change accordingly . Using this pri...

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Abstract

The invention relates to an aircraft three-dimensional surface flow distribution wind tunnel measurement method. A structured light-based binocular vision three-dimensional point cloud reconstructionsystem and a multi-view image acquisition system are used for wind tunnel three-dimensional flow distribution measurement. Firstly, the binocular vision system is used to reconstruct the surface of awind tunnel test model. According to the aircraft three-dimensional surface flow distribution wind tunnel measurement method, the binocular vision system is utilized to perform the three-dimensional reconstruction of the surface of the wind tunnel test model; a small number of marking points are distributed on the model or at the periphery of the model; and point cloud splicing processing is carried out, so that the point cloud information of the surface of the wind tunnel test model is obtained. In a wind tunnel test, a plurality of cameras are adopted to perform multi-angle shooting on the model, so that the surface flow information of the model under different visual angles can be obtained; and image-to-three-dimensional point cloud coordinate system transformation is carried out through the information of the marking points arranged on the model or at the periphery of the model, so that a two-dimensional flow image can be mapped onto three-dimensional point cloud, and therefore, the three-dimensional full-surface flow distribution of an aircraft can be obtained.

Description

technical field [0001] The invention relates to a wind tunnel measurement method for three-dimensional surface flow distribution of an aircraft, which is a method for measuring the heat flow, pressure or frictional resistance distribution on the entire surface of an aircraft three-dimensional model in a wind tunnel. Background technique [0002] With the increase of flight speed and height of new aircraft, the problem of aerodynamic parameter measurement is becoming more and more important and needs to be solved urgently. As far as the ground test is concerned, it is very important to be able to accurately and comprehensively predict the distribution of aerodynamic parameters on the surface of the aircraft. [0003] Sensitive coating technology uses sensitive materials to convert physical parameters such as "heat flow", "pressure" and "friction resistance" on the model surface into "light" signals for collection and processing, so as to obtain high-precision test data. Comp...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06
CPCG01M9/06
Inventor 文帅纪锋贾广森朱万琳韩曙光陈星毕志献
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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