Surface flow studies of restricted shock separation in a thrust optimized parabolic nozzle

In this paper. surface flow features such as length of separation region and separation bubble are studied during restricted shock separation condition in a thrust optimized parabolic nozzle. It is found that peaks in the variation of these surface flow features are directly related to beginning of conditions for flow transition suggesting changes in exchaust flow features which are responsible for initiating flow transitions in a nozzle. Results are obtained from surface oil tests performed during the shut down phase for a range of nozzle pressure ratio during which restricted shock separation condition is prevalent