Flow Characteristics of Supersonic Under-expanded Reattached Jet

(Effect of Offset Distance)

Abstract

Supersonic under-expanded free jet has different flow characteristics than incompressible jet, and there are many studies on practical applications such as jet and rocket engines. However, supersonic under-expanded reattached jet has not been studied enough. In this study, the flow characteristics of a supersonic under-expanded jet from a two-dimensional nozzle that reattaches to the offset side wall are investigated by experimental and numerical analyses. In particular, the effect of offset distance on the flow characteristics of supersonic under-expanded reattached jets are examined. The Schlieren method, Pitot tube, and CFD program were used for flow visualization, measurement of jet velocity distribution, and comparison with experimental results, respectively.