• Jubear Shaik
• Dr. Viswanath Bellie

Abstract-- A numerical study was undertaken to study the effect of plain and feathers winglet configuration on the performance of a 3D wing at a velocity of 20 m/s and angle of attack of 6, 8 and 10 deg. Baseline configurations along with four different winglet configurations were studied. The winglets studied are the blended type toward top and bottom and feathered winglets on the top and bottom side. A validation study was undertaken and it was found that the force values predicted by the software were very close to the forces measured in the experiments conducted over a 3D wing at higher angle of attack of 14 deg.The chord wise pressure distribution was seen to change with the span wise location between the root and the tip and this distribution is affected by the wing tip vortex The wingtip was observed to change the pressure distribution near the tip The velocity field, stream lines and the vorticity were seen to be affected by the presence of the wing tip The lift and drag values were seen to increase with the angle of attack. Both the lift and drag values increase with the addition of the winglet compared to the baseline case. However, the increase in the area due to the addition of the winglet was considered to be the change in lift and drag. The ratio of lift to drag is seen to be affected with minor changes due to the addition of the winglets. The drag polar analysis revealed that the addition of winglet leads to get a higher lift for the same amount of drag. This is observed for all the winglet configurations. The winglet toward the top direction is seen to perform better than the winglet toward the bottom direction. Irrespective of the side where the winglets were added, feathered winglets performed better than the plain winglets breaking of the wingtip vortex. This may be the cause behind the better performance of the feathered winglets.

plain and feathers wiglet configuration, angle of attack, pressure distribution, drag polar analysis and lift to drag ratio.

"Analysis Of Flow Over A wing with Feather Like Winglets", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 7, page no.669-678, July-2018, Available :http://www.jetir.org/papers/JETIR1807559.pdf

"Analysis Of Flow Over A wing with Feather Like Winglets", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 7, page no. pp669-678, July-2018, Available at : http://www.jetir.org/papers/JETIR1807559.pdf