Enhancing Efficiency of H-Darrieus Wind Turbines through Experimental and Numerical Investigations of Double Darrieus Configurations

Abstract

This research paper presents a comprehensive investigation of the performance and aerodynamic characteristics of a double-blade Darrieus wind turbine utilizing a NACA 0018 airfoil. The study combines wind tunnel testing and numerical simulations using Ansys software to analyze the turbine's behavior under varying wind conditions. Experimental measurements of torque, power output, and blade forces were obtained, while computational fluid dynamics simulations provided insights into flow patterns and pressure distribution. The results demonstrated close agreement between experimental and numerical approaches, validating the accuracy of the computational model. The analysis highlighted the influence of wind speed on turbine performance and the favorable aerodynamic characteristics of the NACA 0018 airfoil. The findings contribute to wind turbine design optimization and offer valuable insights for future research in renewable energy. Furthermore, the research identified the optimum case in the experimental method for the double-blade Darrieus vertical axis wind turbine. The results revealed that the most efficient position is situated at a distance of 4 cm and 3 cm from the rotor, which corresponded to 40% to 30% in terms of the distance ratio. Notably, a 6.7% improvement is observed when comparing single blade and double blade numerical results.