Helicopter Dynamic Stall Study

This paper describes rotor and airfoil dynamic stall characteristics,dynamic stall active and Passive Control,and dynamic stall numerical simulation in rotor comprehensive analysis.UH-60A helicopter 11029 flight is a representative example of rotor dynamic stall.The rotor blades can encounter dynamic stall on the retreating blade because of high angle of attack,and on the advancing blade because of shock induced leading-edge separation.On airfoil dynamic stall characteristics,shows typical lift,drag-and pitching moment hysteresis loops with sin-wave and saw-tooth incidence variation,and the influence of reduce frequency and Reynolds number on airfoil dynamic stall characteristics.describes the airfoil with Nose-Droop Control dynamic stall active Control,and the airfoil with Leading Edge VOrtex Generators on dynamic stall Passive Control.