A three year research effort on "A Fundamental Study of Compressibility Effects on Dynamic Stall ofFixed and Adaptive Airfoils" was initiated in 1994. The research led to an understanding of: some of thekey mechanisms of compressible dynamic stall including when the flow over the airfoil is transonic;the Reynolds number effects which strongly alter the detailed flow physics making extension oflaboratory results to full-scale conditions extremely challenging, and the role of transition and a needto model it properly in computations. Further, the results demonstrated the major role of the airfoilleading edge curvature in producing the flow gradients that are responsible for dynamic stall onset,which enabled the development of a dynamically developing leading edge (DDLE) airfoil for effectiveflow control by modifying the vorticity field in the flow. The significant results of the effort aresummarized in this report.
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