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Author(s): Sathyabhama Alangar, Adila Rajiv, Sandeep Sai, Sandeep Kumar, Akash cheekolu
Keywords: MAV, Winglet, Induced drag, Stall delay
Micro Air Vehicles (MAVs) are increasingly being used for civil and military surveillance. As the surveillance requirements are increasing, improving the range of MAVs becomes imperative. The performance of MAVs can be improved if the problem of induced drag due to wingtip vortices can be alleviated. In this paper, the effects of a feather like winglet structure on the performance of a fixed-wing MAV wing at a free stream velocity (U∞) of 20 m/s are studied. Multiple winglet configurations are used to compare the results with the baseline wing. An incompressible, steady three-dimensional simulation is carried out using the k-ꞷ SST turbulence model. The experimental studies carried out for the baseline wing matched well with those obtained from CFD. Since the numerical model is valid, only computational study is done for the modified wing. The stall angle of the baseline wing is around 26°. Numerical results show that when the proposed winglet is used, the stall angle for the wing is increased to around 32°. The use of the winglet did not produce a considerable advantage at the lower Angle of Attack (AOA), but at higher AOA, the lift coefficient (Cl) was considerably higher. The overall drag coefficient (Cd) was higher at lower AOA when the winglet is used. But at AOAs greater than 5°, the Cd reduced. Other effects of the winglet are addressed in terms of improvement in Lift-to-drag ratio (L/D) and reduction in vorticity. The effect of the location and number of the feathers was studied to come up with an optimum winglet configuration. Keywords: MAV, Winglet, Induced drag, Stall delay

Journal of Applied Fluid Mechanics

The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating.