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首页> 外文期刊>Renewable energy >Effect of airfoil shape on power performance of vertical axis wind turbines in dynamic stall: Symmetric Airfoils
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Effect of airfoil shape on power performance of vertical axis wind turbines in dynamic stall: Symmetric Airfoils

机译：翼型形状对动态旋转垂直轴风力涡轮机电源性能的影响：对称翼型

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The current design of vertical axis wind turbines (VAWTs) suffers from inevitable change in tip speed ratio, lambda, in variant wind conditions due to fixed rotor speed. At relatively high wind speeds, which are promising due to high wind power potential, VAWTs operate at low lambda with poor power coefficient. Morphing airfoils can be a potential solution by modifying the airfoil shape to optimal at each lambda. The optimal airfoil shape for VAWTs at low lambda, where dynamic stall is present, has not yet been studied in the literature, therefore, the present study addresses this gap by focusing on this regime to serve as a step towards designing morphing airfoils for VAWTs by identifying the optimal airfoil shape at low lambda. The present study performs a combined analysis of three shape defining parameters, namely the airfoil maximum thickness and its position as well as the leading-edge radius, to reveal the overall design space. The analysis is based on 252 high-fidelity transient CFD simulations of 126 identical airfoil shapes. The simulations are verified and validated with three experiments. The results show that the three shape defining parameters have a fully coupled impact on the turbine power and thrust coefficients. When lambda reduces from 3.0 to 2.5, the optimal airfoil changes from NACA0018-4.5/2.75 to NACA0024-4.5/3.5, that is increasing the maximum thickness from 18%c to 24%c and shifting its position from 27.5%c to 35%c, while the leading-edge radius index, I, remains 4.5. In general, reducing I from the default value of 6.0 to 4.5 is found to increase the turbine C-P. (C) 2021 The Author(s). Published by Elsevier Ltd.
机译：由于固定的转子速度，垂直轴风力涡轮机（瓦文）的目前的垂直轴风风力涡轮机（VAWTS）的设计突出了尖端速度比的不可避免的变化。在相对较高的风速下，由于高风电势导致，这是由于高风电势，在低λ处运行，功率系数差。通过在每个λ在每个λ在每个λ在最佳状态下，可以是翼型的变形翼型可以是潜在的解决方案。在Lowlambda下的最佳翼型形状，其中存在动态摊位，因此尚未在文献中研究，因此，本研究通过关注这一制度来解决这种差距，以朝着为盗贼设计变形翼型的步骤在低λ处识别最佳翼型形状。本研究执行三种形状的组合分析，该形状限定参数，即翼型最大厚度及其位置以及前沿半径，以揭示整体设计空间。分析基于126个相同翼型形状的252个高保真瞬态CFD模拟。使用三个实验进行验证和验证模拟。结果表明，三种形状限定参数对涡轮机电力和推力系数具有完全耦合的影响。 Lambda从3.0降低到2.5时，最佳翼型从NaCa0018-4.5 / 2.75变为NaCa0024-4.5 / 3.5，这增加了18％C至24％C的最大厚度，并将其位置从27.5％C增加到35％ C，虽然前沿RADIUS索引，I，仍然为4.5。一般来说，发现从默认值为6.0到4.5的默认值增加涡轮机C-P。 （c）2021提交人。 elsevier有限公司出版

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