Multi-Objective Optimization of a Small Horizontal-Axis Wind Turbine Blade for Generating the Maximum Startup Torque at Low Wind Speeds

Generating a high startup torque is critical factor for the application of small wind turbines in regions with low speed. In present study, blades turbine were designed and optimized to maximize output power torque. For this purpose, chord length twist angle considered as design variables, multi-objective optimization study was used assess optimal blade geometry. The element momentum (BEM) technique calculate goals genetic algorithm utilized perform optimization. BEM method tools verified tunnel test results base Schmitz equations, respectively. showed that from aerodynamic viewpoint, can be divided into two sections: r/R < 0.52, which responsible generating torque, ≥ where most generated. By increasing (especially length) 0.52 section following ideal distributions part, 140% rise observed only 1.5% reduction coefficient, compared blade. Thereby, speed reduced 6 m/s 4 blade, provides greater possibilities operation areas lower speeds.