Abstract
The structure of, pseudo-shock waves generating in underexpanded sonic jet has been investigated. In order to elucidate the structure the flow visualization was conducted by both the schlieren and shadowgraph methods. Further, the pressure and velocity distributions etc. in the flow were measured. The experiments for the five kinds of test pipe of different inner diameter were carried out for mean Mach numbers, ranging from 0.8 to 2. As a result, the fundamental forms of flow, the length of pseudo-shock waves, and the correlation between the static pressure and velocity distributions were clarified.
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