Advances in Aerospace Science and Applications. ISSN 2277-3223 Volume 3, Number 3 (2013), pp. 227-234 © Research India Publications http://www.ripublication.com/aasa.htm On the Aerodynamic Performance of Dragonfly Wing Section in Gliding Mode Syed Fahad Anwer 1 , Intesaaf Ashraf 2 , Hussain Mehdi 1 , Akhlaq Ahmad 1 and Grafi H 3 1 Department of Mechanical Engg, ZHCET, AMU Aligarh-202002. 2 Graduate student, Department of Mechanical Engg, IIT Bombay, Powai, Mumbai. 3 Department of Mechanical Engg, Taibah University, P.O. Box. 344, Al Madina Al Munawara, Kingdom of Saudi Arabia. Abstract A comprehensive numerical of fluid dynamic study of a pleated wing section based on the wing of Aeshna Cyanea has been performed at ultra low Reynolds numbers corresponding to the gliding flight of these dragon flies. The simulations employ an unstructured triangular mesh based on finite volume discritization. A critical assessment of the computed results was performed. In this work, we investigate the aerodynamic characteristics and spatio-temporal dynamics of a cut section of Aeshna Cyanea's wing. Numerical simulations were performed at ultra low Reynolds numbers (100 to 1000) at different angle of attacks ranging from 0 o to 15 o . The results give a satisfactory measure of confidence in the fidelity of the simulation. The effect of the Reynolds number on the gliding ratio is that at Re 1000 and at angle of attack (here after, AOA) 15 o . The largest gliding ratios are obtained. Flow invariably for all Reynolds number, minimum Drag coefficient is obtained at AOA 15 o . Keywords: Gliding flight; pleated airfoil; Aeshna Cyanea; Gliding Airfoil; Ultra Low Reynolds number. 1. Introduction There are two modes of flight in insects. First and the more dominating mode is the flapping mode while the second mode is the gliding flight. In a dragon fly, both modes