A collection and measurement method for oil flow display wind tunnel test
A technology of wind tunnel test and measurement method, which is applied in the direction of measuring device, aerodynamic test, machine/structural component test, etc. It can solve the problems of low calibration accuracy, low degree of digitalization of equipment, and less display orientation, and achieve oil flow image clarity effect
Active Publication Date: 2018-08-31
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology
[0004] This technology is used to display the surface flow structure of the flow field in the wind tunnel test. However, in the existing technology, the technology and devices used in the acquisition and quantitative measurement of the oil flow display are relatively backward, and the digitalization of the equipment is low, and the display orientation Less, low calibration accuracy, it is difficult to meet the actual needs
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[0048]Using the surface oil flow test technology, the test results reflecting the flow separation characteristics of the attitude-orbit control jet disturbance can be obtained. However, under different test models and different test conditions, the adaptability of the oil flow formula (composition, viscosity, etc.) is different, and the requirements of the oil flow acquisition and calibration system (equipment parameters, equipment location, etc.) are also different, so specific research must be carried out The object is to conduct a study on the adaptability of the surface oil flow test technique.
[0049] In order to obtain a clear surface oil flow map, in addition to conducting adaptive research on the oil flow ratio technology, a high-precision, digital oil flow acquisition and calibration system was constructed, mainly including: high-resolution digital area array camera, Fixed focus lens, camera protective cover, light source, voltage regulator, computer and image proces...
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The invention discloses a collection and measurement method for an oil flow display wind tunnel test. Image calibration and measurement rely on a prepared calibration template; quantitative calibration is carried out on a surface oil flow picture through image processing; and therefore, the surface flow condition of a flow field can be collected and analyzed quantitatively in a high-precision and digitalized manner. An image acquisition device adopted in the invention is based on new digital acquisition technologies and includes a plurality of acquisition devices; the acquisition devices are placed at different positions, and therefore, image information can be obtained in a multi-directional manner, multi-angle display of a surface flow structure can be benefitted; and the position and angle of a light source can be adjusted properly through adjusting the positions and angles of a lamp holder and a base position.
Description
technical field [0001] The invention relates to a collection and measurement method for an oil flow display wind tunnel test, belonging to the technical field of flow display. Background technique [0002] Oil flow display technology is a key technology in the field of flow display, which is used in wind tunnel tests to display the flow area and structural form of the model surface. It is an effective method for the study of complex flows, especially for various forms of separation flow and vortex flow. The flow near the object surface is the starting point for the formation of the entire space flow, and the development of the space flow can be analyzed and understood on the basis of understanding the flow of the object surface. [0003] The principle of this method is: the oil flow display method utilizes oil mixed with pigments to flow on the surface of the object to form stripes, which can conveniently display the friction lines on the surface of the object. The image o...
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IPC IPC(8): G01M9/02G01M9/06
CPCG01M9/02G01M9/067
Inventor 倪招勇李素循曹宁
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS