Testing device and method for calibrating response frequency of shear sensitive liquid crystal coating
A technology of liquid crystal coating and response frequency, which is applied in the field of test devices for calibrating the response frequency of shear-sensitive liquid crystal coatings, can solve problems such as difficulty in calibrating the response frequency of shear-sensitive liquid crystal coatings, and achieves simple structure, low equipment requirements, and convenience. The effect of disassembly
Active Publication Date: 2022-03-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
[0005] In view of the deficiencies in the prior art above, the object of the present invention is to provide a test device and method for calibrating the response frequency of the shear-sensitive liquid crystal coating, so as to solve the problem of difficulty in calibrating the response frequency of the shear-sensitive liquid crystal coating in the prior art; The invention is based on the shear sensitive liquid crystal coating technology and the dynamic pressure measurement technology, and completes the calibration of the response frequency of the shear sensitive liquid crystal coating
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[0033] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.
[0034] refer to figure 1 As shown, a test device for calibrating the response frequency of the shear-sensitive liquid crystal coating flow field of the present invention includes: a support 1, a high-speed camera 2, a wedge 3, a Laval nozzle 4, a high-frequency dynamic pressure sensor 5, and The disassembled lower wall plate 6, dynamic pressure acquisition system 7, light source 8, equal straight pipe 9, rotating cam 10; wherein,
[0035] The supersonic gas flow at the outlet of the Laval nozzle 4 generates an incident shock wave at the leading edge of the wedge 3 and extends to the lower wall of the straight pipe 9, interacting with the turbulent boundary layer to produce a symmetrical flow...
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The invention discloses a test device and method for calibrating the response frequency of a shear sensitive liquid crystal coating. The device comprises a wedge, a Laval nozzle, a light source, a bracket, a high-speed camera, an equal straight pipeline, a detachable lower wall plate, a high-frequency dynamic pressure sensor, a dynamic pressure acquisition system and a rotating cam, a shear sensitive liquid crystal coating test is performed on half of a symmetrical flow field structure, a pressure measurement test is performed on the other half of the symmetrical flow field structure, and the influence on wall surface pressure measurement due to the fact that the shear sensitive liquid crystal coating flows into a pressure measurement hole after being blown is avoided; the detachable bright black metal plate is adopted on the lower wall face of the equal-straight pipeline and is convenient to detach for repeated tests, the color change of the shear-sensitive liquid crystal coating is more obvious through the bright black bottom plate, and the color developing effect of the shear-sensitive liquid crystal coating is improved.
Description
technical field [0001] The invention belongs to the field of aerodynamics, and specifically refers to a test device and method for calibrating the response frequency of a shear-sensitive liquid crystal coating through a high-frequency dynamic pressure sensor. Background technique [0002] The shear-sensitive liquid crystal coating has optical properties sensitive to shear stress, and the color development of the shear-sensitive liquid crystal coating is not only related to the magnitude of the stress received, but also related to the direction of the stress. Under the vertical illumination of a white light source, the spatial spectrum image reflected by the shear-sensitive liquid crystal coating is captured by a camera, and the distribution of wall friction can be obtained. [0003] Based on the shear-sensitive liquid crystal coating technology, a large number of experimental studies have been carried out, and the quantitative analysis of the shear-sensitive image informatio...
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IPC IPC(8): G01M9/02G01M9/06G01M9/08
CPCG01M9/02G01M9/06G01M9/08
Inventor 王成鹏马张煜王英玉焦运张蓝天娄向前李宇航
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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