Motion-capturing pressure-sensitive paint method under transient illumination by plasma source

The motion-capturing pressure-sensitive paint (PSP) method is validated under transient illumination to capture unsteady surface pressure. It is applied to measure a wall pressure distribution in a footprint of a fluctuating oblique shock generated by near-surface electric discharge in a supersonic airflow. For a surface pressure measurement using PSP, the electric discharge adds transient illumination that overlaps with the PSP emission. By using the motion-capturing PSP method, unsteady surface pressure including the plasma-induced shock wave is captured with temporal resolution of 10 kHz. Comparison to the existing PSP method as well as uncertainty analysis are also given.