Abstract
Supersonic impinging jet on at flat plate is commonly used as a simple model of flow field of industrial applications of high speed jet such as an assist gas for laser cutting, a cooling jet in glass tempering process and so on. In case of axisymmetric jet, the air flows radially along the plate after the impingement and forms an underexpanded jet under certain conditions. In this study, such radial underexpanded jet is issued from a slit nozzle, which consists of two circular tubes facing to face each other. Jets at different pressure ratios across the nozzle are experimentally visualized using Schlieren method. Screech sound radiated from the jet is measured using microphone. Position of the sound source is considered to be near the end of second cell or in the region downstream of the second cell.
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