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SENSITIVITY OF A SHOCK-BOUNDARY LAYER INTERACTION TO GEOMETRIC PERTURBATIONS

David B. Helmer
Department of Mechanical Engineering Stanford University 488 Escondido Mall Building 500, Stanford, CA 94305; Department of Civil & Mechanical Engineering, U.S. Military Academy, West Point, NY, USA, 10996

Laura M. Campo
Department of Mechanical Engineering Stanford University 488 Escondido Mall Building 500, Stanford, CA 94305

John K. Eaton
Dept. of Mechanical Engineering Stanford University 488 Panama Mall Stanford, CA 94305 USA

Аннотация

2D Particle Image Velocimetry (PIV) was used to study the sensitivity of the shock-boundary layer interaction (SBLI) generated by a small 20° compression ramp in a low aspect ratio continuously operated wind tunnel. A PIV survey of the unperturbed case was taken. The size of the wedge influenced the interaction, which was weaker than that observed in the case of a large compression wedge. Geometric perturbations were introduced upstream of the compression wedge on the opposite wall. Significant changes were observed in the interaction zone, with the system sensitivity a strong function of position in the interaction.