Control of Dynamic Stall of an Airfoil by Using Synthetic Jet Technology

Abstract

In this paper, the dynamic stall characteristics of the S809 airfoil have been numerically predicted, and the flow under dynamic stall condition has been controlled by introducing synthetic jet for enhancing the airfoil aerodynamic performance. In addition, experimental results have been adopted to validate the obtained numerical ones. The results show that the oscillation of the airfoil can delay the occurring of stall, and the stall angle of attack is increased from 9.5° to 13.1°. The introduction of synthetic jet can improve the lift coefficient of airfoil under dynamic stall conditions: The mean lift coefficient in a period of oscillation has been increased by 33%, and the drag coefficient has been reduced by 39%. Moreover, the stall angle of attack is increased from 13.1° to 16.2°. Therefore, the airfoil performance under dynamic stall condition could be greatly improved by the introduction of synthetic jet technology.