EXPERIMENTS ON BOUNDARY-LAYER RECEPTIVITY TO FREESTREAM TURBULENCE

An understanding of the physical mechanisms by which freestream turbulence (FST) affects boundary-layer transition to turbulence is essential for transition prediction and control. Presented here is a brief summary of some experimental studies on the topic of boundarylayer receptivity. All cases mentioned concern layers on either flat-plates or axisymmetric bodies, and only cases of a relatively low turbulence level are included. Those restrictions are necessarily exclusive of the environments and configurations important for turbomachinery. The studies described reveal that a layer can respond to FST in several ways, exhibiting what are called K-mode oscillations, Tollmien-Schlichting (T-S) waves, and other motions not classified. Although the studies have focused upon finding and describing T-S wave growth as the principal cause of the hastening of transition, that link is not firmly established. Much work remains to be done before a description of the interaction based upon 'first principles' can be applied to transition prediction.

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