Global oil film thickness online measurement method based on two-color imaging
A technology of oil film thickness and two-color imaging, applied in the field of wind tunnel test, can solve the problems of model vibration, unknown model pose parameters, and the influence of model pose parameters need to be considered in measurement, so as to improve the anti-interference ability.
Active Publication Date: 2021-08-17
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology
First of all, the transmission measurement method is used for the microscopic characterization of the object surface and the measurement of the film thickness. For the wind tunnel test model, the oil film covers the surface of the model, and the model is an opaque material, so only the reflection measurement method can be used. method; secondly, because the global oil film thickness distribution on the model surface needs to be obtained in real time, the traditional point detection method is not competent, and the global oil film thickness distribution needs to be obtained by imaging; finally, in the wind tunnel test, in the unsteady The model will vibrate under the action of aerodynamic force, resulting in the unknown pose parameters of the actual model, while the oil film thickness measurement needs to consider the influence of the pose parameters of the model
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[0056] Such as image 3 As shown, this embodiment proposes a method for online measurement of global oil film thickness based on two-color imaging, including the following steps:
[0057] S1, preparing oil film;
[0058] Aiming at the problem that the measurement signal is weak due to the thin oil film thickness, the present invention needs to prepare an oil film meeting the requirements of the wind tunnel test for on-line measurement of the global oil film thickness. First of all, using the ASD spectrometer to measure the spectrum of common oil film materials methyl silicone oil, lubricating oil and diesel oil, it can be seen that methyl silicone oil has a strong absorption peak at 800nm (±10nm), and lubricating oil has a strong absorption peak at 614-645nm, 736nm, 776nm and 914nm. There are strong absorption peaks between -1038nm and diesel oil has strong absorption peaks at 736nm, 738nm and 898nm. It can be seen that the absorption wavelengths of commonly used oil film m...
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The invention provides a global oil film thickness online measurement method based on two-color imaging, and the method is characterized in that the method comprises the following steps: S1, preparing an oil film; S2, performing an oil film thickness and absorptivity calibration test under the condition of different model pose parameters, and establishing an oil film thickness and absorptivity relation model containing the model pose parameters; and S3, solving the oil film thickness by using the oil film thickness and absorptivity relation model containing the model pose parameters. According to the invention, by establishing the oil film thickness and absorptivity relation model containing the model pose parameters, the problems existing in the current global oil film thickness measurement method can be solved.
Description
technical field [0001] The invention relates to the technical field of wind tunnel tests, in particular to an online measurement method for global oil film thickness based on two-color imaging. Background technique [0002] Frictional resistance is an important part of the total resistance of an aircraft during flight. For modern wide-body airliners, the frictional resistance accounts for nearly 50% of the total resistance during cruising flight, far exceeding other resistance items. Reducing frictional resistance can not only improve aircraft performance , and can greatly reduce operating costs; for hypersonic vehicles, the maximum friction can account for more than 50% of the total resistance, and reducing friction is of great significance for increasing the range of the aircraft and reducing surface heat flow. Accurately measuring the frictional resistance of aircraft is indispensable for the research and design of aircraft drag reduction. The friction measurement techno...
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IPC IPC(8): G01B11/06
CPCG01B11/0633
Inventor 余皓张征宇吴继飞杨振华陈植冯黎明李瑞
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT