Abstract
The paper describes the results of experimental investigation of underexpanded jet impinging on a plate. When the pressure ratio across the convergent nozzle exceeds the critical value (1.893 for air), the jet becomes underexpanded. The jet is not uniform due to the presence of the expansion wave, the compression wave and the shock wave in it. This flow field is often observed in the assist gas of laser cutting, the exhaust jet of STOVL aircraft and rocket. When the flat plate is placed in this flow field, the strong wave called "plate shock" appears near the flat plate. The fluid that passes through the plate shock moves at subsonic speed toward the flat plate, and then spreads over the plate as its speed increases, where the wall jet forms. The schlierenphotography and shadowphotography are used to visualize the flow field. In this experiment the angle between the plate and the jet axis is changed, and the flow filed is observed. The results were compared with each other for different angles.
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