Numerical Investigation of Passive and Active Control of Unsteady Compressible Flow

Abstract

Numerical simulations of flow controls applied to airfoils undergoing oscillatory motion in compressible flow are presented. Currently available efficient and accurate numerical methods for the full compressible flow equations and advanced turbulence models are used for the numerical predictions. Time-accurate computations at low angles of incidence indicate development of flow unsteadiness for the slatted airfoil. It is found, however, that the leading-edge slat effectively suppresses dynamic stall, it improves dynamic blade response, and reduces flow separation, for compressible flow speeds. It was also found that dynamic stall can be suppressed using control with pulsating jets.