Airfoil Dynamic Stall and Aeroelastic Analysis Based on Multi-frequency Excitation Using CFD Method

This paper conduct a comprehensive research on time varying pitching, plunging (flapping) motion and Periodic alternating oncoming flow for NACA0012 airfoil in order to accurately capture the real aerodynamic characteristics and airfoil responses of the rotor blades in complex unsteady flow field. When simulating the pitch motions, the excitation of the second and third harmonic were got into consideration. The result shows that: (1) the aerodynamic coefficient generated for the steady stall and pitching motion are compared well with the experimental data; (2) when the second and third harmonic were got into consideration for the pitching motion, the aerodynamic loads and response show significant difference which would be used for active control of helicopter.