关键词: 压敏漆, 喷涂质量, 图像滤波, 精准度

Abstract: Pressure-sensitive paint measurement system are established in 0.6m trisonic wind tunnel after subsystem synchronization control problem is resolved. Based on the established pressure-sensitive paint system, the effect of coating on surface pressure distribution, image filtering technology and the measurement stability and accuracy of pressure-sensitive paint system are studied. The system is applied to the wing surface pressure measurement test under future large passenger aircraft drag reduction and shock control project of the National Natural Science Foundation of China, and obtaining the pressure distribution and the shock position of the original wing and the bump wing on the wing upper surface, then the design of bump is verified to have a good shock control effect in design state. The research indicates, the changes in surface roughness and thickness caused by the lack of coating quality can significantly affect the pressure distribution, spray quality need strict control. Gaussian filtering with 8-pixel window and 3-times iteration gives better smoothing of pressure fluctuations without distortion. The pressure coefficient measurement root mean square deviation of the established pressure-sensitive paint system and pressure sensor is less than 0.022, pressure-sensitive paint system measurement accuracy is high. The design bump can effectively weaken the shock wave and improve the lift and drag characteristics of the wing in the design state and non-design state.

Key words: Pressure-sensitive Paint, Quality of Coating, Image Filtering, Accuracy