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Studies on Wake Passing over Boundary Layers on a Flat Plate Experiencing Favorable and Adverse Pressure Gradients

This paper deals with the investigation of the flat-plate boundary layer over which wakes generated by the transversely moving bars sweep in a periodical fashion. Main focus of this paper is on how the wake effects upon the boundary layer behavior is affected by the existence of favorable and adverse pressure gradients over the boundary layer. Detailed measurements of the boundary layer are conducted by use of a hot-wire anemometry, in conjunction with surface temperature measurements with thermocouples. An ensemble-averaging technique is employed in order to extract the periodic events associated with the wake passage from the acquired data. It is accordingly found that the wake passage induces a siginificant change in the flow structure downstream of the end of the flow acceleration. Also found is that the reappearance of the separation bubble tends to be retarded, probably due to a calmed region effect.