A Multiple-Parameter Optimization of Darrieus Vertical Axis Wind Turbine for Enhanced Performance

This paper aims to optimize a small vertical-axis wind turbine (VAWT) by analyzing chord length, hub radius, and circular angle, and establishing a relationship between design parameters and performance. The approach involves evaluating five airfoils and identifying the best airfoil using QBlade, based on comparisons of the power coefficient (CP), tip speed ratio (TSR), and the power output (P). Mathematical relationships are developed through extrapolation using polynomial, logarithmic, and modified Avrami equations. The result shows that the 'S1046 17%' is the best-performing airfoil among the five. The optimum chord length to hub radius ratio yields the highest power output, and the impact of circular angle on performance is negligible. The Avrami equation shows better fitness to the original data than the polynomial equation. The Troposkien variant shows a higher CP over a wide range of TSR, while the straight blade produces higher power output across varying wind speed (V).