Abstract
In order to investigate the oscillation of an underexpanded impinging jet and the behavior of plate shock wave in the vicinity of a plate, we visualize the flow field mainly using the Mach-Zehnder technique and measure the pressure on the plate. At a nozzle pressure ratio of 3.0, the shape of the plate shock wave changes periodically with nozzle-plate spacings. However, when the spacing exceeds a certain value, the type of oscillation changes markedly. The change of oscillation is confirmed by interferograms and pressure measurements. Comparing the jet structure with the oscillation, the change can be considered to be caused by instability of the jet boundary.
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