Intensive studies on unsteady secondary separations and oscillating shock waves in three-dimensional shock waves/turbulent boundary layer interaction regions induced by sharp and blunt fins

This paper discusses the secondary separations and oscillating shock waves in shock wave / turbulent boundary layer interaction region in supersonic flows. In the experiments, sharp and blunt fins are selected as shock generators and the unsteady interaction region is investigated by using flow visualization techniques, such as oil flow method, schlieren photograph and shadow graph. Also pitot pressure distribution is measured. For detailed visualization, a color oil flow method, various colored oil come oozing through many holes in surface, has developed improving conventional oil flow method. Using this new technique, we’ve succeeded to visualize the secondary separation in the interaction region. In addition, oscillating shock waves are captured using instantaneous shadow graph and the high—speed video camera system.