Numerical simulation study on dynamic stall of airfoil controlled by combined blow-suction

Abstract

One of the key problems to improve the aerodynamic characteristics of airfoil is to solve the dynamic stall.This paper presents a method to control the dynamic stall of airfoil by using the combination of leading-edge suction and trailing edge suction. The influence and control effect of pitch oscillation on the dynamic stall characteristics of airfoil are investigated. Taking NACA0012 airfoil as the research object, the unsteady Reynolds-averaged Navier-Stokes equation is solved based on the transition SST turbulence model, and the aerodynamic characteristics of airfoil with different jet momentum coefficients are calculated, and the economy in the control process is evaluated. It is found that under the conditions of Mach number 0.109, reduction frequency 0.1, average angle of attack 14.84° and amplitude 9.89°, when the jet dynamic coefficient is 0.006 5, compared with the control without blowing and suction, the airfoil has no obvious stall phenomenon, the average lift coefficient increases by 59%, the average drag coefficient decreases by 40%, and the negative pitching moment peak is eliminated, which indicates that the combined blowing-suction flow control can suppress the dynamic stall and improve the aerodynamic characteristics of the airfoil.

Keywords

• dynamic stall
• flow control
• airfoil
• blowing and suction
• jet momentum coefficient