Abstract
The numerical simulations for cycloidal propellers based on five airfoils with different thickness are presented in this paper. The CFD simulation is based on sliding mesh and URANS. The result of CFD simulation indicates that all test cases share similar flow pattern. There are leading edge vortex and trailing edge vortex due to blade dynamic stall. Interaction between the vortices shed from upstream blade and the downstream blade is observed. There is also variation of the flow velocity encountered by the blade due to downwash in the cycloidal rotor cage. These factors result in large fluctuations of the aerodynamics forces on the blade. The comparison of the forces and flow pattern indicates that the thickness of the airfoil is very important parameter that influents the flow pattern and hence the performance of the cycloidal propeller.
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