Effect of Dimple on Aerodynamic Behaviour of Airfoil

Abstract

In order to boost the efficiency of an airfoil, surface of the airfoil is altered. A two dimensional airfoil was analysed with and without dimples on the upper surface using CFD software. NACA0012 non cambered airfoil with and without dimples were used for analysis with k-ɛ turbulent model. Both were compared keeping in mind the coefficients of lift and drag. Dimples were located at four different positions and compared mutually with smooth airfoil. The velocity of flow was keeping constant for different angles of attack. In CFD analysis results were fluctuated with size of grid so as to get rid of the fluctuating, a grid independency test was done before final analysis. During grid independence test numbers of nodes were increased until constant results come.