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首页> 外文期刊>International journal of green energy >Effects of inward and outward overlap ratios on the two-blade Savonius type of vertical axis wind turbine performance
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Effects of inward and outward overlap ratios on the two-blade Savonius type of vertical axis wind turbine performance

机译：向内和向外重叠比对垂直轴风力涡轮机性能的双叶片曲粒型型的影响

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摘要

In this paper, using numerical simulation, the effects of inward and outward overlaps on the performance of a conventional two-blade Savonius wind turbine and the complete analysis of the events caused by the rotation of the blades have been investigated. Computations have been carried out at several nondimensional overlap ratios such as G/d = 0, +/- 0.1, +/- 0.2, and +/- 0.3 for three wind speeds of 3, 5, and 7 m/s. On the other hand, in the present study, the values of the tip speed ratio (TSR) are considered in the range from 0.2 to 1.2. The obtained results are validated against the available data in the open literature and found excellent agreements between them. Several results such as the instantaneous velocity and pressure fields in the rotating zone, variation of torque coefficients in one complete cycle of the rotor, and mean power coefficient distributions as a function of TSR and wind speed have been presented in this numerical investigation. The results show that, regardless of the overlap ratio, the maximum power coefficient occurs at a tip speed ratio (TSR) of 0.8. Additionally, the maximum power coefficient is observed in the inwards overlap ratio of 0.2 and an increasing or decreasing the overlap ratio reduces the maximum value of the power coefficient in all wind speeds under consideration. Finally, it was concluded that at each TSR and G/D value, increasing the wind speed enhances the power coefficient of two-blade Savonius VAWT. It was hoped the obtained results arouse interest among the VAWT designers.
机译：本文采用数值模拟，研究了向内和向外重叠对传统双叶片风力涡轮机的性能的影响以及由叶片旋转引起的事件的完全分析。计算已经以若干非潜能的重叠比进行，例如G / D = 0，+/- 0.1，+/- 0.2，+/- 0.3，其三个风速为3,5和7m / s。另一方面，在本研究中，尖端速度比（TSR）的值在0.2至1.2的范围内被认为。获得的结果针对公开文学中的可用数据验证，并在它们之间找到了良好的协议。诸如旋转区中的瞬时速度和压力场的若干结果，在该数值研究中介绍了转子的一个完整循环中的扭矩系数的变化，以及根据TSR和风速的函数的平均功率系数分布。结果表明，无论重叠率如何，最大功率系数以0.8的尖端速度比（TSR）发生。另外，在向内的重叠率为0.2的内向量中观察到最大功率系数，并且重叠率的增加或减小降​​低了所考虑的所有风速中的功率系数的最大值。最后，得出结论，在每个TSR和G / D值下，增加风速增强了双刀片救酷VAWT的功率系数。希望获得的结果引起了VAWT设计师之间的兴趣。

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