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PIV INVESTIGATION OF SPANWISE VARIATION IN INCIDENT SHOCK BOUNDARY LAYER INTERACTIONS

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

David B. Helmer
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

Abstract

Two incident shock boundary layer interactions (SB-LIs) were documented using high resolution 2D particle image velocimetry (PIV). The incident shock wave for each interaction was generated using a sub-boundary layer fully spanning 20° compression wedge on the top wall of the test section. A relatively weak SBLI occurred when the incident shock was generated using a 1.1mm (0.20δ0) high wedge, and a stronger interaction occurred when the incident shock was generated using a 3.0mm (0.55δ0) high wedge. For each SBLI, velocity and turbulence measurements were obtained in four planes across the span of a low aspect ratio test section − one near the center of the tunnel, and three inside the side wall boundary layer. The measurements indicated strong three-dimensionality in both interactions, with the interaction strength decreasing significantly near the side walls. Both interactions show regions of intermittent flow reversal, with the maximum value approximately tripled for the interaction generated by the larger wedge. Mean flow reversal was observed near the centerplane of the stronger SBLI, but not for the weaker SBLI.