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    INVESTIGATION OF DOUBLE-BLADED DARRIEUS TURBINE POWER PERFORMANCE BY USING UNSTEADY CFD
    (2023-12) Al-Sudani, Yasser Abbas Ali
    Wind speed and direction are key factors in selecting a wind turbine. Different designs are required for different wind conditions. Vertical- axis wind turbines are preferred, especially in frequently changing wind directions. There are different types of Darius turbines among these vertical turbines. They are classified according to their straight or spiral structure and the number of blades. The performance of the Darrieus turbines and the effects of design changes are examined through CFD analysis. In this study, a single-blade design and three new designs with the addition of second blades for a three-blade Darius turbine were presented. The performance of these new designs and standard Darius turbines was compared. The performance of these four designs was measured and analyzed in different wind conditions. CFD analyzes examined the flow characteristics in detail and contributed to the design development. Unsteady-state CFD analyzes and visualizes how flow characteristics affect turbine performance. The CFD analysis revealed the operational conditions for four designs. Design 1 achieved its highest Cp value of 0.272 at a TSR value of 5. Design 2 was not successful because DWT had no performance improvement. For Design 3, the peak Cp of 0.213 occurred at a TSR of 3.25, while Design 4 reached its highest Cp value of 0.110 at a TSR of 1. Additionally, all designs produced a negative torque value at a TSR of 10.