Verification of Sliding Ratio (Cl /Cd) of Airfoil through CFD Analysis

Abstract

Blades are very essential parts of HAWT (horizontal axis wind turbine). The lift/drag ratio is an important criteria of the aerodynamic efficiency of airfoil. In this study CFD (Computational Fluid Dynamics) analysis is performed for the verification of sliding ratio (Cl/Cd) of NACA airfoil 63(4)-221. CFD analysis is conducted at low Reynolds number in range of x105 as well as high Reynolds number in the range of x106 . Angle of attack is taken in the range of 4o to 7o . For present work the blade length is taken 14 meters, which is a new design of blade for RRB V27-225 kW horizontal axis wind turbine blade (HAWT). Then results obtained from CFD analysis are compared with the available literature