Towards smart blades for vertical axis wind turbines: different airfoil shapes and tip speed ratios

IF 3.6 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Mohammad Rasoul Tirandaz, Abdolrahim Rezaeiha, Daniel Micallef
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Abstract

Abstract. Future wind turbines will benefit from state-of-the-art technologies that allow them to not only operate efficiently in any environmental condition but also maximise the power output and cut the cost of energy production. Smart technology, based on morphing blades, is one of the promising tools that could make this possible. The present study serves as a first step towards designing morphing blades as functions of azimuthal angle and tip speed ratio for vertical axis wind turbines. The focus of this work is on individual and combined quasi-static analysis of three airfoil shape-defining parameters, namely the maximum thickness t/c and its chordwise position xt/c as well as the leading-edge radius index I. A total of 126 airfoils are generated for a single-blade H-type Darrieus turbine with a fixed blade and spoke connection point at c/2. The analysis is based on 630 high-fidelity transient 2D computational fluid dynamics (CFD) simulations previously validated with experiments. The results show that with increasing tip speed ratio the optimal maximum thickness decreases from 24 %c (percent of the airfoil chord length in metres) to 10 %c, its chordwise position shifts from 35 %c to 22.5 %c, while the corresponding leading-edge radius index remains at 4.5. The results show an average relative improvement of 0.46 and an average increase of nearly 0.06 in CP for all the values of tip speed ratio.
朝着智能叶片垂直轴风力涡轮机:不同的翼型形状和尖端速度比
摘要未来的风力涡轮机将受益于最先进的技术,这些技术不仅使它们能够在任何环境条件下高效运行,而且还能最大限度地提高功率输出并降低能源生产成本。基于变形叶片的智能技术是实现这一目标的有前途的工具之一。本文的研究为垂直轴风力机的变形叶片方位角和叶尖速比函数的设计迈出了第一步。这项工作的重点是对三个翼型形状定义参数的单独和组合准静态分析,即最大厚度t/c及其弦向位置xt/c以及前缘半径指数i。在c/2处具有固定叶片和辐条连接点的单叶片h型达里欧斯涡轮共产生126个翼型。该分析基于630个高保真瞬态二维计算流体动力学(CFD)模拟,之前已通过实验验证。结果表明,随着叶尖速比的增加,最佳最大厚度从24% c(占翼型弦长米数的百分比)减小到10% c,弦向位置从35% c移动到22.5% c,而相应的前缘半径指数保持在4.5。结果表明,各叶尖速比值的CP值平均提高了0.46,平均提高了近0.06。
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
Wind Energy Science
Wind Energy Science GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY-
CiteScore
6.90
自引率
27.50%
发文量
115
审稿时长
28 weeks
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