A motion-capturing pressure-sensitive paint (PSP) system is applied to a fluttering motion of an airfoil. It consists of a two-color PSP combined with a high-speed color camera. By simply rationing the green and red images, we can cancel the illumination non-uniformity and the change in the camera-PSP distance that causes substantial error for a time-resolved PSP measurement. The system is applied to an YXX wing with 30% span. The time-resolved pressure measurement is obtained at the camera frame rate of 100 Hz. The wing oscillates at the primary frequency of 13.7 Hz. The unsteady pressure distribution including the shock oscillation over the wing is captured.
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