Experiments on Interaction Between a Traveling Shock Wave and a Turbulent Jet

The interaction of a turbulent jet and a plane shock wave traveling in a shock tube was optically observed. Various arrangements of both subsonic and supersonic jets were used. Some typical shadowgraphs are reproduced and discussed. As a direct result of its passage through the jet, the shock wave developed a bulge. The growth and behavior of this bulge were recorded through a sequence of instantaneous shadowgraphs. The transverse spread and the changing profile of this bulge offer an interesting visual demonstration of the angle of spread and decay of the jet flow. I t is shown that beyond an equivalent distance of about twelve jet diameters the bulge-profile reaches a state of similarity. When the shock and the jet impinged against each other head on, an intense, intermittent, and high frequency acoustic radiation manifested itself in the flow field behind the shock front. Some plausible explanations of this phenomenon are advanced.