The acceleration effect on aerodynamic performance of flapping wing air vehicle (FWAV) is studied. A multi-degree-of-freedom three-dimensional bionic flapping wing motion model with acceleration effect is established and the hydrodynamic performance can be obtained by CFD. The aerodynamic coefficient variations are combined to reveal the aerodynamic and pressure distribution characteristics at the transient and peak moments under each acceleration coefficient. The results show that compared with conventional flapping, the acceleration effect of the flapping wing can significantly increase the aerodynamic lift and thrust. The accelerated downstroke of the flapping wing changes the intensity of leading-edge vorticity and trailing edge vorticity, and increases the eddy current adhesion area of the upper surface of the wing. The acceleration effect also increases the capture effect of last cycle LEV shedding of the flapping wing, thus significantly improving aerodynamic performance of the flapping wing.
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