Effects of Corrugation and Camber on Aerodynamics of Dragonfly Wing in Forward Flight
The corrugated dragonfly wings are always deformed with cambered sections during flight.To study the aerodynamic performance of dragonfly wings in forward flight,two dimensional corrugated airfoils are designed,considering the heights and chordwise location of maximum camber.Then the aerodynamic forces are calculated in Fluent software by the overlapping grid method.Firstly,lift of the corrugated airfoils with positive camber are significantly improved compared with flat airfoil.Both the lift and thrust can be enhanced when the airfoil is well-designed with camber such as m=4％and p=0.2.Secondly,the lift of cambered airfoils is increased while the trust will be decreased when the torsional angle is enlarged in flapping.Moving the position of maximal camber height to the trailing edge can help to improve the trust at high torsional angle.As a result,the aerodynamic performance of corrugated airfoil can be greatly improved by introducing the camber with well-designed height and position.
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