Particle image velocimetry (PIV) technology was applied to obtain the evolution of the flow field induced by microsecond pulse plasma aerodynamic actuation

while the starting vortex

flow filed and wall jet were analyzed at different air pressures. Thrust created by the actuator was calculated and analyzed based on the experimental data. Experiment results showed that one starting vortex was found at the ground pressure and the pressure of 5500Pa

while two starting vortices were found at the pressure of 19000Pa and 11700Pa. The steady configuration of the flow field was complex

and evolved towards L

∽ and V structure as the pressure decreased. The reaction time of the flow field and the tangential distance of the wall jet induced by plasma aerodynamic actuation decreased as the pressure decreased

while the normal distance of the wall jet increased. The maximum thrust also decreased as the pressure decreased

and its x coordinate became closer to the actuator.