Analysis of Effectiveness an Airfoil with Bicamber Surface

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International Journal of Engineering and Technology (IJET) – Volume 3 No. 5, May, 2013 Fig: Stress distribution of NACA 4412 Profile Profile name Bicambe r velocit y Lift Force 60m/s 4908.6 3 N Fig: Stress Displacement of Bicamber Profile Stress (max) 953787 N/m^2 Stress (min) 1189.09 N/m^2 Strain (max) Strain (min) Displacement (max) 1.03523e-005 2.87658e-008 0.0694524 mm Naca 4412 60m/s 4908.6 3 N 1.07106e+006 N/m^2 1708.52 N/m^2 1.18481e-005 3.7737e-008 0.085971 mm ISSN: 2049-3444 © 2013 – IJET Publications UK. All rights reserved. 576
International Journal of Engineering and Technology (IJET) – Volume 3 No. 5, May, 2013 4. COMMENTS This research shows how the bicamber profile acts perfectly in vortex condition. As angle of attack increases the vorticity in upper surface also increases, so the lift force reduces and drag force increases. In turbulent flow, vortex is created in the clips between the two camber of a bicambered foil. The lifting effect reduced by the vorticity is recovered by generating the lift force in 2 nd camber. Thus, the lesser vortex effect in bicamber profile results in higher lift force and lower drag force, hence increases the lift by drag ratio. In this research the Author finds that lift-drag ratio of the bicamber airfoil is higher than NACA profile.On the other hand, the angle of attack increases lift-drag ratio is inversely proportional to the angle of attack. And findings suggest that for same lift force, both maximum displacement and stress are lower for a bicambered foil when compared with NACA profile. Thus, airfoil with bicamber profile is more effective than NACA profile. ACKNOWLEDGEMENT The author is grateful to the University of Illinois for providing airfoil coordinate data . REFERENCES [1] Badran O (2008). Formulation of Two-Equation Turbulence Models for Turbulent Flow over a NACA 4412 Airfoil at Angle of Attack 15 Degree, 6th International Colloquium on Bluff Bodies Aerodynamics and Applications, Milano, 20-24 July. [2] Douvi C. Eleni*, Tsavalos I. Athanasios and Margaris P. Dionissios,( 2012) “Evaluation of the Turbulence Models for the Simulation of the Flow Over a National Advisory Committee for Aeronautics (NACA) 0012 Airfoil”, Journal of Mechanical Engineering Research Vol. 4(3), pp. 100-11. [3] Frederick.L.Felix.(March,7,1995) “Airfoil with Bicamber Surface”, United State Patent Number 5395071 [4] S.Kandwal1 and, Dr. S. Singh(2012) "Computational Fluid Dynamics Study Of Fluid Flow And Aerodynamic Forces On An Airfoil". International Journal Of Engineering Research & Technology (IJERT) Vol. 1 Issue 7, September – 2012 .ISSN: 2278-0181 [5] McCroskey WJ (1987). A Critical Assessment of Wind Tunnel Results for the NACA 0012 Airfoil. U.S. Army Aviation Research and Technology Activity, Nasa Technical Memorandum, 42: 285-330. [6] Menter FR (1994). Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications. AIAA J., 32: 1598-1605 ISSN: 2049-3444 © 2013 – IJET Publications UK. All rights reserved. 577
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Analysis of Effectiveness an Airfoil with Bicamber Surface

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