Abstract
Vertical axis wind turbines (VAWTs) are appropriate for operating under low wind speeds. However, many VAWT designs have been developed. The aim of this paper is to develop a low-cost model to evaluate and compare the aerodynamic performance of Gorlov and Darrieus-type straight-bladed VAWTs. For this purpose, a double multiple stream tube (DMST) model has been developed for Darrieus and Gorlov VAWTs. Subsequent to the validation of the developed models with the available results in the literature, a comparison has been performed between the Darrieus and Gorlov VAWTs. Then, the role of geometrical and operational parameters on the aerodynamic performance and the torque coefficient curves of Gorlov VAWT has been evaluated. It has been found that the performance of Gorlov rotor is better from the effectiveness and fluctuation standpoints. The results of parametrical evaluation of the studied Gorlov turbine show that maximum power coefficient (CP) is obtained for NACA 0018 airfoil. In addition, the number of blades and the helical angle variation are significant parameters in reducing the oscillation of aerodynamic loads and rotor stability. Moreover, self-starting behavior has been improved with increasing the blade chord length or free wind velocity and deteriorated by the usage of thinner airfoils.
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