Numerical Study on the Effects of Corrugation of the Gliding Dragonfly Wing

We investigate the aerodynamic performance of the dragonfly wing, which has cross-sectional corrugation, via a static 2-dimensional unsteady simulation. Computational conditions are Re=150, 1400, and 10000 with angles of attack ranging from 0 to 40 degrees. From the computational results, lift coefficients are increased by the wing corrugation at all Reynolds number. However, corrugation has little influence on the drag coefficients. The flows such as vortex in the valley of corrugation and near the edge of corrugation are locally different from those of an elliptic wing. However, such local flows have little influence on the time averaged wing performance. From the numerical experiment presented in this study, it is determined that suction side corrugations of the wing have very little influence on increase of the lift coefficient at a positive angle of attack.