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2D Numerical analysis of a VAWT wind farm for different configurations

机译：不同配置的VAWT风电场的二维数值分析

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With the global focus on exploring more efficient and cost effective wind energy based power generation techniques, vertical axis wind turbines (VAWT) have emerged as a good option at small house hold scale. For large built-up area units having combined roof such as residential blocks etc., possibility of having a clustering of small VAWT as a wind farm is quite attractive; albeit very little is available in literature from CFD analysis perspective. This paper presents a novel 2D CFD analysis of a 2.75m diameter vertical axis wind turbine (VAWT) in a farm configuration. An urban area roof top scenario with a favorable and an adverse VAWT array configuration is analyzed. Further, the effect of variation of inter-turbine distance is also studied for these configurations. Each turbine consists of three vertically aligned NACA0022 turbine blades separated apart by an angle of 120°. Each turbine has a chord length of 0.23m. The initial results presented in this paper correspond to the freestream velocity of 12 m/sec with a tip speed ratio (TSR) variation from 1 to 4. Interesting results are obtained from the present research for both favorable and adverse configurations. A von Karman type vortex shedding is observed in the wake of all the VAWT configurations considered. For the adverse configuration (I-type configuration in which the VAWT's are in tandem), the performance of downwind VAWT reduces drastically. With the increase in their mutual separation distance along the flow direction, the performance drop recovers. However, still the performance is lower than a single VAWT. Whereas, for the favorable configuration (T-type configuration in which the VAWT's are staggered), the performance of the downwind VAWT increases and is higher than a single VAWT. The performance improvement decreases with the increase in their mutual separation distance.
机译：随着全球对探索更有效和更具成本效益的基于风能的发电技术的关注，垂直轴风力涡轮机（VAWT）已成为小规模住宅的一种不错的选择。对于具有组合屋顶的大型建筑面积单位（例如居民区等），将小型VAWT聚集为风电场的可能性非常诱人;尽管从CFD分析的角度来看，文献资料很少。本文介绍了在农场配置中对直径为2.75m的垂直轴风力涡轮机（VAWT）进行的新颖2D CFD分析。分析了具有有利和不利的VAWT阵列配置的市区屋顶场景。此外，还针对这些构造研究了涡轮间距离的变化的影响。每个涡轮机均由三个垂直对齐的NACA0022涡轮机叶片组成，它们之间的间隔为120°。每个涡轮的弦长为0.23m。本文介绍的初始结果对应于12 m / sec的自由流速度，尖端速度比（TSR）从1到4变化。有趣的结果从本研究中获得了有利和不利的配置。在考虑了所有VAWT构型后，观察到了von Karman型涡旋脱落。对于不利的配置（VAWT串联的I型配置），顺风VAWT的性能将大大降低。随着沿流向的相互分离距离增加，性能下降得以恢复。但是，性能仍然低于单个VAWT。然而，对于有利的构造（其中VAWT交错的T型构造），顺风VAWT的性能增加并且高于单个VAWT。性能提高随着它们相互分离距离的增加而降低。

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