الفهرس 
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Abstract
This research mainly aims to design simulate and evaluate the performance of an innovative hybrid vertical axis wind turbine (VAWT) to enhance self-starting abilities and sustainability obtaining a wide operational range. This design is predicted to allow reducing the power losses during the energy conversion process applied by the wind turbine. A comprehensive research and research were carried out to discover the model parameters for developing a new optimal hybrid turbine structure. The designed hybrid VAWT has a 3-bladed NACA 0015 Darrieus turbine with a 2-bladed Semielliptic Savonius rotor in its center, which was modeled and evaluated in computational fluid dynamics (CFD) to compute the rotor configuration’s distinctive parameters. The grid was then generated using the 2D geometry that was modeled using Solidworks in ANSYS Meshing for computational fluid dynamics (CFD) simulations to analyze new configuration performance. The CFD model had been solved using the k-ω SST turbulence model and SIMPLE algorithm. Analysis Results demonstrated that the Solo-Darrieus turbine had a maximum power coefficient (CP) of 37.9% at a TSR of 2.16 However, it was unable to selfstart and needed high start-up torque. The novel hybrid turbine showed a maximum CP of 36.5% at a TSR value of 2 and an operating range up to a TSR of 4.65. while exhibited enhancement in self-starting abilities by 29.5% compared to SoloDarrieus. the suggested hybrid system shows improving in the performance and operating range when compared to earlier hybrid VAWT configurations that contribute to the prospects for energy sustainability.