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The design of micro air vehicles (MAVs) introduces aerodynamic performancechallenges due to the small size and, consequently, the low Reynolds number10000-1. Natural fliers are naturally optimized and are comparable in sizeto MAVs, making them a potent candidate to mimic for the design of MAVs. Thedragonfly frequently uses a gliding mode of flight relative to the other smallfliers and operates at a range of 100-10000. The literature suggests that thecorrugated profile improves the aerodynamic efficiency around Re at 104. Itallows us to investigate the aerodynamic advantages of tandem corrugatedairfoil inspired by the dragonfly wing. In this paper, we perform directnumerical simulations of flow past bio-inspired corrugated wing to understandthe impact of the tandem wing configuration. The horizontal distance betweenthe wings is fixed, and the vertical distance varies. The results reveal thatthe forewing/hindwing interaction increases the lift of the forewing relativeto the isolated wing for all the case studies. The combined drag coefficientdrops by approximately 7%, and overall efficiency drops by approximately 13%relative to an isolated wing for a case study with zero vertical spacingbetween forewing and hindwing at 3 degree angle of attack, fixed for bothwings. With no vertical gap, the aerodynamic efficiency matches close to theisolated wing with the decrease in tandem wing combined drag coefficientcompared to an isolated wing.

Aerodynamic performance of a tandem wing configuration inspired from dragonfly gliding flight for MAV application