Design and optimization of horizontal axis wind turbine blade by using CFD method

While the demand for fossil fuel is declining, Investments in renewable energy sources and allocated budgets increase, contributing to the increasingly digitalizing world. In the studies on renewable energy, the need to focus on obtaining more benefits by further developing the existing energy systems has become a very important requirement. In this study, firstly, the horizontal axis wind turbine blade has been designed and it has been aerodynamically optimized in this design. A turbine blade with a total length of 25.5 m with a 3 m long root part has been designed by giving 19 plane rotation angles to NACA 4415 profiles in Solidworks environment. Blades are designed six different twist angle and once the most efficient twist angle for the blade was determined, analysis began. Analyzes made at variable speeds, it has been determined that; the number of turns 16 RPM at 10 m/s speed is reached at approximately 45º angle of attack, the power produced is approximately 210 kW; the number of turns of 16 RPM at 15 m/s speed is reached at approximately 38º angle of attack, the generated power is approximately 560 kW, the number of turns 16 RPM at 20 m/s speed is reached at approximately 28º angle of attack, the generated power is approximately 650 kW, the number of turns 16 RPM at 25 m/s speed is reached at approximately 23º angle of attack, the generated power is approximately 800 kW, has been determined. When compared with the studies that have been done, the results of the studies in literature are clearly compatible with the wind turbine blade design optimization values. In the comparison made between the analyzes at different speeds and angles of attack, it was seen that the torque value obtained at 16 RPM rotation number in the analyzes made at different speeds showed parallelism. It is seen that similar studies have been done widely in the literature at different speeds and angles of attack of a horizontal axis wind turbine. However, by keeping the number of turns in a rotation constant, this study also contributes to the literature in terms of comparing it to the analyzes made at different speeds and angles of attack.