Experimental investigation of the transonic shock-wave/boundary-layer interaction over a shock-generation bump

A transonic shock-wave/boundary-layer interaction (T-SWBLI) established on a shock-generation bump has been investigated experimentally through particle image velocimetry and high-speed schlieren. The T-SWBLI flowfields have been examined in detail. The near-wall interaction region is visualized with high spatial resolution through schlieren and is further investigated through conditional statistical analysis. The unsteadiness associated with the shock-wave motion is of special interest. The shock-wave locations are extracted to allow spectral analysis of the shock-wave oscillations. The Fourier modal analysis on the schlieren image ensemble is finally reported. The Fourier modes confirm the low-frequency unsteadiness in the shock-wave region and the interaction region. Moreover, the flow fluctuation in the rear part of the interaction region is found to extend into the medium-frequency regime. In addition, the present experimental study showcases that schlieren is a powerful tool in resolving near-wall structures by making use of short exposure time and converged statistics.