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Abstract
In order to research the three-dimensional effects on the dynamic stall of rotor blade, the unsteady flowfields of finite-wing and rotor are simulated under dynamic stall conditions respectively. The unsteady RANS equations coupling with third -order Roe-MUSCL spatial discretization scheme are chosen as the governing equations to predict the three dimensional flowfields of finite-wing and rotor, and the Spalart-Allmaras turbulence model is employed to calculate the viscidity of unsteady flowfields. Fro m the simulation results of finite-wing, it is illustrated that the aerodynamic loads of wing would be reduced due to the effect of wing-tip vortex. As a result, the dynamic stall vortex o f wing would be weakened near the wing-tip. Therefore, the peaks of lift coefficient, drag coefficient, and pitching moment coefficient are decreased near wing-tip. The spanwise flow on finite-wing would cause accumulation of dynamic stall vortex. As a result, the dynamic stall is restricted near the wing-root, and aggravated near wing-tip. By simulating the flowfield of a rotor in forward flight, it is illustrated that the centrifugal force would lead to generate spanwise flow. As a result, the dynamic stall characteristics of rotor would be restricted due to the Coriolis force. What is more, the decrease of angle of attack o f rotor b lade induced by downwash flow would inhibit the dynamic stall characteristics further.

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  Three-Dimensional Effects on Dynamic Stall of Rotor Airfoil

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