1602 Effect of Unsteady Fluid Force affected by Vortex Behavior in the Wake of Three-Dimensional Airfoil
Details
Unsteady fluid forces acting on a discoid airfoil in the upward motion with a constant velocity were measured by using the ring structure 2 elements balance. Furthermore, the vorticity field around the airfoil was also described with the flow visualization technique. Dynamic lift/drag coefficients were compared to the steady ones. It is confirmed that the upward motion with a constant velocity is available for keeping lift higher after the separation occurs. The delay of stall for the airfoil is observed and also the value of maximum lift coefficient is greater than the maximum lift coefficient under stationary condition. Furthermore, the value of maximum lift coefficient and the dynamic stall angle are improved as increasing the non-dimensional frequency. The dynamic lift is affected by vortex behavior around the airfoil.
