Abstract
Supersonic jet is used as a cooling jet in glass-tempering process and an assist jet in laser cutting. The jet issuing from a nozzle impinges on a work piece and then, it turns outward and radially spreads out. The radial flow is underexpanded if a supply pressure is very high. In this study, the radial jet is split off from the impinging jet in order to analyze it in detail. The jet is exhausted from a slit nozzle which is composed of two tubes being settled face to face. The flow field is visualized and the sound wave emitted from the jet is measured. As a result, the sound wave is found to have a directivity of 45 degrees against the radial jet plane. And a screech tone is measured which is similar to that observed in an axisymmetric underexpanded jet from a round nozzle.
