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A computational investigation to analyze the effects of different rotor parameters on hybrid hydrokinetic turbine performance

机译：分析不同转子参数对混合动力水轮机性能影响的计算研究

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摘要

Cross flow hydrokinetic turbines have been considered a decent choice for riverine applications. Under the present work, performance of hybrid rotor cross flow hydrokinetic has been investigated for different rotor parameters. The proposed hybrid rotor is the combination of two conventional turbine rotors (Savonius and Darrieus). Investigations have been performed by considering flow velocity varying in the range from 0.5 m/s to 2.0 m/s. The performance of hybrid rotor was assessed in term of power coefficient (C-T) and torque coefficient (C-P). Further, comparison of hybrid rotor and single Darrieus rotor has been carried out on the basis of their performance. Flow behaviour across the turbine vicinity is analyzed and discussed with the pressure, velocity contours and velocity streamlines. It has been found that radius ratio and attachment angle play a crucial role in performance enhancement with reduction in torque fluctuations. For the considered range of rotor parameters, the maximum power coefficient (C-Pmax) and average torque coefficient (C-Tavg) were obtained as 0.109 and 0.1276 corresponding to radius ratio of 0.6 at an attachment angle of 90 degrees. Further, power coefficient and torque coefficient of hybrid rotor are found to be improved by 37.97% and 35.88% respectively as compared to single Darrieus rotor.
机译：横流水力透平涡轮机被认为是河流应用的不错选择。在目前的工作中，已经研究了混合转子错流流体动力学性能对不同的转子参数。提出的混合转子是两个常规涡轮转子（Savonius和Darrieus）的组合。通过考虑流速在0.5 m / s至2.0 m / s范围内的变化进行了研究。根据功率系数（C-T）和扭矩系数（C-P）评估了混合转子的性能。此外，已经基于它们的性能对混合转子和单达里厄斯转子进行了比较。通过压力，速度轮廓和速度流线分析和讨论了涡轮机附近的流动特性。已经发现，半径比和附接角在减小扭矩波动的性能提高中起关键作用。对于转子参数的考虑范围，在90度的附着角下，最大功率系数（C-Pmax）和平均转矩系数（C-Tavg）分别为0.109和0.1276，对应于半径比0.6。此外，发现混合动力转子的功率系数和转矩系数分别比单一的Darrieus转子提高了37.97％和35.88％。

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