On the Flow Mechanism in Pseudo-Shock Region

It is well known that when a shock-boundary layer interaction is comparatively strong, the shock in a duct extends over a great distance, which is called a pseudo-shock wave. Many investigations have been reported so far on pseudo-shocks. In these studies, however, the flow in pseudo-shock region was considered as a black box and only the flow properties across the shock were discussed. In the present paper, the flow mechanism in pseudo-shock region is experimentally investigated, especially for the flow field between the first- and the third-shocks composing a pseudo-shock. As the result, it is clarified that, in the flow region under the bifurcated foot of the first shock, which was considered to be a uniform flow region, the flow is decelerated along the streamwise direction. Taking into account the fact described above, the mechanism of generation of the second-shock is discussed in detail