Abstract
The purpose of this investigation is to develop the flapping-wing micro air vehicles based on dragonflies. We attempted to product mechanical flapper based on dragonflies. The flow fields and aerodynamic force of the mechanical flapper were measured with dynamic PIV system. The flow field around the mechanical flapper was almost the same as that of dragonfly. The leading edge separation and wake capture process can be observed. The aerodynamic force of the mechanical flapper was proportional to the second powers of the flapping frequency. The aerodynamic lifting force of the mechanical flapper was 0.68 times of weight the flapper at the flapping frequency of 37.6 Hz. It corresponded to twice of dragonflies' weight, it therefore indicated that the mechanical flapper generated sufficiently large enough to lift the dragonflies.
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