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The incipient separation induced by the shock wave turbulent boundary layerinteraction at the sharp fin is the subject of present study. Existing theoriesfor the prediction of incipient separation, such as those put forward by McCabe(1966) and Dou and Deng (1992), can have thus far only predicting the directionof surface streamline and tend to over-predict the incipient separationcondition based on the Stanbrook's criterion. In this paper, the incipientseparation is firstly predicted with Dou and Deng (1992)'s theory and thencompared with Lu and Settles (1990)' experimental data. The physical mechanismof the incipient separation as induced by the shock wave/turbulent boundarylayer interactions at sharp fin is explained via the surface flow patternanalysis. Furthermore, the reason for the observed discrepancy between thepredicted and experimental incipient separation conditions is clarified. It isfound that when the wall limiting streamlines behind the shock wave becomes\aligning with one ray from the virtual origin as the strength of shock waveincreases, the incipient separation line is formed at which the wall limitingstreamline becomes perpendicular to the local pressure gradient. The formationof this incipient separation line is the beginning of the separation process.The effects of Reynolds number and the Mach number on incipient separation arealso discussed. Finally, a correlation for the correction of the incipientseparation angle as predicted by the theory is also given.

Incipient Separation in Shock Wave Boundary Layer Interactions as Induced by Sharp Fin