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Global surface friction resistance testing method based on optical flow algorithm

A surface friction and testing method technology, applied in the field of wind tunnel testing, can solve the problems of complex film preparation, multiple measurement considerations, shear displacement, etc., and achieve high spatial resolution, single consideration factors, and easy calibration

Pending Publication Date: 2022-08-05
XIHUA UNIV
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Problems solved by technology

The shear-sensitive liquid crystal method (SSLC) determines the magnitude and direction of the friction force through color, but it is very difficult and complicated, and requires more observation points to place cameras. It is not easy to carry out related experiments in many wind tunnels
The surface stress-sensitive film (S3F) method is based on the conversion of elastic deformation of the film into surface loads (pressure and shear stress). The main disadvantage of this method is that the preparation of the film is complicated and the measurement considerations are not single. Shear Displacement of Elastic Body

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  • Global surface friction resistance testing method based on optical flow algorithm
  • Global surface friction resistance testing method based on optical flow algorithm
  • Global surface friction resistance testing method based on optical flow algorithm

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Embodiment Construction

[0048] In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are some, but not all, embodiments of the present application. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0049] Unless otherwise defined, technical or scientific terms used in this application shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. As used in this application, "first", "second" and similar words do not denote any order, quantity, or importance, but are merel...

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Abstract

The invention relates to the technical field of wind tunnel tests, and discloses a global surface friction resistance test method based on an optical flow algorithm, which comprises the following steps: coating a test oil agent on the surface of a model to be tested to form an oil film, and carrying out a wind tunnel test under the irradiation of an ultraviolet light source; continuously acquiring oil film evolution images of the test oil agent on the to-be-tested model by adopting imaging equipment; based on the relationship between the oil film brightness and the oil film thickness in the oil film evolution image, deducing to obtain an oil film motion function; iteratively solving the oil film motion function by using an optical flow algorithm to obtain an oil film motion speed; and acquiring the surface friction resistance based on the function relationship between the surface friction force and the oil film movement speed. According to the surface friction resistance testing method, direct interference to a flow field is avoided, and the surface friction resistance can be obtained only through brightness and thickness change information of an oil film.

Description

technical field [0001] The invention relates to the technical field of wind tunnel testing, in particular to a global surface friction resistance testing method based on an optical flow algorithm. Background technique [0002] When an aircraft flies in the air, due to the viscosity of the air, frictional resistance will be generated, and frictional resistance will increase the energy consumption of the aircraft. Therefore, reducing frictional resistance is the focus of aircraft design research, and accurate measurement of frictional resistance is an important way to reduce drag. [0003] After years of development, many methods and technologies have emerged for the measurement of surface friction, but most of them are indirect and non-global methods, such as Preston tube method, hot wire method, bottom baffle method, etc., which only measure a single point Or the local friction force value, and the methods to measure the global friction resistance are the shear sensitive liq...

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Application Information

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IPC IPC(8): G01M9/06G01M9/08G06T7/269
CPCG01M9/06G01M9/08G06T7/269Y02T90/00
Inventor 杜海蒋皓杨章毅陈朔韩胜春杨乐杰
Owner XIHUA UNIV
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