Double-layer blade structure is one of the main methods to improve the starting performance of straight blade vertical axis wind turbines (H-VAWTs). In this paper
the starting performance of H-VAWTs with double-layer blades under the coupled influence of solidity and moment of inertia is investigated using the dynamic mesh method
and the improvement effect of double-layer blade on the self-starting performance of H-VAWTs under different wind turbine structures is analyzed. The results show that the double-layer blade can effectively improve the startup performance of H-VAWTs
and the startup duration can be shortened by more than 30%; the peak torque of the outer-layer blade in the double-layer blade is not necessarily higher than that of the single-layer blade
but under the interaction of the inner and outer blades
the torque performance of the double-layer blade is significantly better than that of the single-layer blade. Under the conditions of different blade numbers
chord lengths and wind turbine diameters
the double-layer blade H-VAWTs has higher torque peaks at the start-up stage
and the torque peaks appear earlier than the single-layer blade
which results in higher start-up acceleration of the double-layer blade wind turbine
and the wind turbine rotational speed reaches the steady state earlier.
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