A kind of low temperature transonic equipment tsp transition measurement test method
A test method and transonic technology, which is applied in the field of low-temperature transonic equipment TSP transition measurement test, can solve the problems of reduced measurement accuracy and low resolution of heat transfer characteristics, and achieve the goal of improving heat transfer resolution and transition measurement accuracy Effect
Active Publication Date: 2020-11-24
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology
However, at transonic speed, the temperature difference between the test model and the incoming flow is small, and the resolution of the heat transfer characteristics is not high, which leads to the reduction of the measurement accuracy of the existing TSP temperature-sensitive transition measurement technology
Method used
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Embodiment 1
[0047]The test model of this embodiment is a metal wing model based on a supercritical airfoil. The sweep angle of the test model is 20°, the chord length is 20mm, and the span length is 600mm; the CCD camera is a scientific-grade camera with a resolution of 1600×1200 Pixel, acquisition speed 44 frames per second; optical filter is installed on the observation window; light source is LM2x-400LED array light source, output power is greater than or equal to 3W, and intensity is higher than 10mW / cm 2 .
[0048] This example shows that image 3 Shown are the final results for the transition locations on the test model surface.
[0049] From image 3 It can be seen that the low-temperature transonic equipment TSP transition measurement test method of the present invention can accurately distinguish the light intensity ratio variation law under different incoming flow conditions, and thus determine the transition position of the airfoil.
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The invention discloses a TSP transition measurement test method for low-temperature transonic speed equipment. The measuring device comprises a test model, a CCD camera, a light source, a data processing computer, a heating device, a moving measuring mechanism, a hot wire probe, a spectrum analyzer and an infrared camera. The surface of the test model is sequentially provided with an insulation heat insulation layer, a heating layer, an insulation heat reflection layer, an insulation heat conduction layer, a temperature-sensitive coating primer and a temperature-sensitive coating finish paintfrom bottom to top. The method comprises the following steps: keeping enough temperature resolution by using a method of heating a test model, and capturing a surface image of the test model througha CCD camera to obtain a surface transition position; meanwhile, acquiring the near-wall surface flow velocity through a hot wire probe, and obtaining the transition position of the other surface through spectral analysis; and obtaining a final surface transition position after comprehensive comparison. According to the method, the working temperature of the TSP test technology can be reduced to 77K from room temperature, the heat transfer resolution and the transition measurement precision are greatly improved, and the method is particularly suitable for researching a flow structure in a low-temperature environment and has popularization and application values.
Description
technical field [0001] The invention belongs to the technical field of low-temperature transonic equipment test, and in particular relates to a TSP transition measurement test method for low-temperature transonic equipment. Background technique [0002] During the flight of the aircraft, the transition position of the boundary layer has a great influence on the friction, surface flow state and flight performance of the aircraft. The determination of the transition position at the flight Reynolds number is one of the key technologies in the design of the aircraft. In the ground test, in order to simulate flight conditions, it is usually realized in a low temperature environment. Conventional boundary layer transition measurement techniques such as naphthalene sublimation method, oil film interferometry, pulsating pressure measurement method, hot film measurement method, infrared measurement method, etc. The effect is poor. The TSP measurement technology uses a high-performan...
Claims
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IPC IPC(8): G01M9/06G01M9/08
CPCG01M9/06G01M9/08
Inventor 王元靖陶洋林俊王红彪熊能刘祥梁锦敏
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT