Self-Starting Capability Improvement of Single and Dual Hybrid Darrieus-Savonius VAWTs, Incorporating a Gear Mechanism

The substantial increase in greenhouse gas emissions has catalyzed the growth of renewable energy sources. In this context, vertical axis wind turbines (VAWTs) have gained significant traction due to their numerous advantages. Notably, Darrieus VAWTs have demonstrated acceptable efficiency; however, their reliance on initial torque and challenges associated with self-starting capabilities prompted advancements in hybrid Darrieus-Savonius VAWTs. Nonetheless, this configuration has primarily been applied within a low tip speed ratio (TSR) range. This study introduces an innovative approach by developing a dual-shaft hybrid rotor. For the first time, this design incorporates Darrieus and Savonius rotors on two distinct shafts, connected through a gear mechanism that regulates the angular velocity of the Savonius rotor. The results indicate that this novel design effectively manages the vorticity field and enhances rotor efficiency. The findings suggest that both single and dual shaft configurations can improve rotor performance by up to ۷۲% and ۹۰%, respectively, in comparison to conventional rotors at a TSR of ۱.۴.

کلیدواژه ها:

Self-starting capability ، Single-shaft hybrid Darrieus-Savonius VAWT ، Dual-shaft hybrid Darrieus-Savonius VAWT ، Gear mechanism ، Vorticity field