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RESEARCH on flow control has been one of the major topics in fluid mechanics in the past couple of decades. Most flow control techniques have been focused on control of separation, which has been achieved by either passive or active techniques. The active flow control techniques typically exploit the combined narrowband receptivity of the separating shear layer and the upstream boundary layer to external actuation (eg, Ho and Huerre [1]). Oster and Wygnanski [2] and Roberts [3] showed that the actuation can affect the global flowfield by modifying the evolution and interactions of the large-scale vortical structures. These modifications can lead to a Coanda-like deflection of the separating shear layer toward the surface (eg, Seifert et al.[4]) such that the layer vortices are advected downstream in close proximity to the surface.

Presented as Paper 4426 at the 25th AIAA Applied Aerodynamics Conference, Miami …