Optimization of kinematic parameters of 3D forward flapping wing
In order to improve the lifting efficiency of the flapping wing,the influences of three kinematic parameters,such as reduced frequency,flapping amplitude and pitching amplitude,on the aerodynamic performance of flapping wing were analyzed by the combination of the Taguchi test and numerical solution of three-dimensional N-S equation.The results showed that compared with the worst parameters combination,the average lifting coefficient and lifting efficiency of the flapping wing with best parameters combination increased by 52.1％and 85.52％,respectively.The influences on the aerodynamic performance of flapping wing referred to reduced frequency,flutter amplitude and pitch amplitude in turn.Further,through analysis of the flow field on the flapping wing surface,it was found that the best parameters combination can enhance the intensity of the vortex attached to the flapping wing surface and promote the formation of von Karman vortex street in the wake of the flapping wing,so as to make the flapping wing have better aerodynamic characteristic.
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