EXPERIMENTAL-STUDY OF AN UNSTEADY SEPARATING BOUNDARY-LAYER

The objective of this research is to map the flowfield around the trai ling edge of a hydrofoil subject to transverse gust loading, to provid e guidance for the formulation of an appropriate Kutta condition for i nviscid solution methods. The hydrofoil is equipped with a trailing ed ge that incurs boundary-layer separation over the last few percent of the chord. Mean and unsteady velocity profiles are presented for the R eynolds number of 3.8 X 10(6) and reduced frequency of 3.6. The locati on of the separation point in steady flow is identified, and the regio n of the separation trajectory in unsteady flow is seen. The magnitude and phase of the unsteady circulation and lift are found and compared to those values predicted by linearized methods.