Abstract
This study focuses on shock oscillation around an external compression supersonic air-intake that called buzz. We carried out flow visualization by schlieren method with a high-speed video camera, and the measurement of static pressure fluctuation around the intake entrance, in order to investigate the effects of air-bleed from the entrance. It is found from the schlieren images that the air bleed suppresses the amplitude of shock oscillation and decreases its dominant frequency. High frequency components are generated in the static pressure fluctuation with the air bleed. This suggests that a new feedback loop is formed around the slit for the natural bleed.
