Effect of Rotation Friction Ratio on the Power Extraction Performance of a Passive Rotation VAWT

IF 0.9 Q4 ENGINEERING, MECHANICAL

International Journal of Rotating Machinery Pub Date : 2019-08-01 DOI:10.1155/2019/6580345

Jianyang Zhu, Chang Tian

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引用次数: 2

Abstract

This paper performs a systematic numerical study to investigate the effect of rotation friction ratio on the power extraction performance of a passive rotation H-type vertical axis wind turbine (H-VAWT). In contrast to the previous literature, the present work does not impose rotation velocity on the turbine, and the rotation friction ratio which reflects the effect of external load characteristics on the turbine is introduced to the governing equation of the turbine. During each iteration, the rotation velocity of the turbine is computed after having determined the aerodynamic torque exerted on the blade of the turbine. This is more consistent with the actual working environment of the H-VAWT. A novel numerical coupling model was developed to simulate the interaction between the fluid and the passive rotation of the H-VAWT; then, the power extraction performance of the turbine with different rotation friction ratio was systematically analyzed. The results demonstrate that the power extraction performance of H-VAWT will be enhanced when the H-VAWT has appropriate rotation friction ratio. It is also found that the flow separation induced by large angle of attack is alleviated essentially if the H-VAWT has appropriate rotation friction ratio, which makes the H-VAWT have better energy extraction performance.

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旋转摩擦比对被动旋转VAWT功率提取性能的影响

本文对被动旋转H型垂直轴风力涡轮机（H-VAWT）的旋转摩擦比对功率提取性能的影响进行了系统的数值研究。与以前的文献相比，目前的工作没有将转速强加给涡轮机，并且将反映外部负载特性对涡轮机影响的旋转摩擦比引入到涡轮机的控制方程中。在每次迭代期间，在确定了施加在涡轮机叶片上的空气动力学扭矩之后，计算涡轮机的转速。这与H-VAWT的实际工作环境更加一致。建立了一个新的数值耦合模型来模拟H-VAWT的流体和被动旋转之间的相互作用；然后，系统地分析了不同旋转摩擦比下水轮机的功率提取性能。结果表明，当H-VAWT具有适当的旋转摩擦比时，H-VAWT的功率提取性能将得到提高。研究还发现，如果H-VAWT具有适当的旋转摩擦比，大攻角引起的流动分离基本上得到了缓解，这使得H-VAWT有更好的能量提取性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Rotating Machinery ENGINEERING, MECHANICAL-

CiteScore

2.40

自引率

0.00%

发文量

审稿时长

25 weeks

期刊介绍： This comprehensive journal provides the latest information on rotating machines and machine elements. This technology has become essential to many industrial processes, including gas-, steam-, water-, or wind-driven turbines at power generation systems, and in food processing, automobile and airplane engines, heating, refrigeration, air conditioning, and chemical or petroleum refining. In spite of the importance of rotating machinery and the huge financial resources involved in the industry, only a few publications distribute research and development information on the prime movers. This journal is the first source to combine the technology, as it applies to all of these specialties, previously scattered throughout literature.