Abstract
The self induced flow oscillation occurs when an underexpanded sonic or supersonic jet impinges on an obstacle. From the previous numerical analysis, it is shown that the existence of the secondary annular flow around the supersonic jet is effective to repress the self oscillation of the mach disk. The purpose of this study is to investigate the effect of the annular flow for repressing the flow oscillation. The flow visualization using the shadowgraph method is carried out and the experimental results are compared with the numerical calculation solved by the TVD method.
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