Aerodynamic performance analysis of NACA 5518 airfoil for wind turbine applications using Q blade

Wind energy is a promising renewable source, with its efficiency largely dependent on the aerodynamic performance of wind turbine blades. The selection of an appropriate airfoil significantly influences key aerodynamic factors such as lift-to-drag ratio, power coefficient, and thrust coefficient, which determine the turbine's overall energy output. This study examines the aerodynamic behavior of the NACA 5518 airfoil using QBlade software to assess its feasibility for wind turbine applications. Computational simulations are conducted based on Blade Element Momentum (BEM) theory and the XFOIL solver, evaluating lift coefficient (Cl), drag coefficient (Cd), power coefficient (Cp), and thrust coefficient (Ct). The designed rotor operates at a tip speed ratio (TSR) of 8.0, with a wind speed of 10.0 m/s at hub height. The blade incorporates nonlinear twist distribution and varying chord length to enhance aerodynamic efficiency. Results indicate that the NACA 5518 airfoil demonstrates strong aerodynamic properties, including high lift generation and delayed stall. The power coefficient (Cp) peaks at 0.63, while the thrust coefficient (Ct) reaches 1.14. Simulations align well with theoretical predictions, affirming the reliability of the computational model. However, increased drag at higher angles of attack suggests a need for further blade design optimizations. These findings underscore the potential of the NACA 5518 airfoil in wind turbine applications, offering high efficiency and improved power output. However, future research should explore flow control strategies and experimental validation for real-world implementation.