光学的可視化法を用いた不足膨張噴流の解析

抄録

In this study, the behavior and structure of underexpanded jet were discussed. The jet becomes underexpanded when the pressure ratio exceeds the critical value across the convergent nozzle discharging it. The jet is not uniform because of the presence of the expansion wave, the compression wave and the shock wave formed in it. Moreover, when a flat plate is placed perpendicularly to the jet, the strong wave called ‘plate shock' appears in the flow field near the plate. In this experiment, the flow field is experimentally visualized in order to analyse the behavior of jet.