Effects of expansion waves on incident shock-wave/boundary-layer interactions in hypersonic flows

The effects of expansion waves on incident shock-wave/boundary-layer interactions (SWBLIs) at a Mach number 4.96 are experimentally studied. flow characteristics the interaction zone under various intensities and positions shock wave quantitatively analyzed. weaken intensity encountered, thereby weakening SWBLIs. With an increasing distance between zone, total wall pressure jump interference length show linear growth trend. However, do not affect initial separation, which is consistent with free-interaction theory. Finally, scaling model proposed by Souverein et al. [“A analysis for turbulent interactions,” J. Fluid Mech. 714, 505 (2013)] simply modified using measured value jump. This correction provides better approximate result SWBLIs impact waves.