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首页> 外文期刊>Journal of Fluids and Structures >Turbulence modelling of low Reynolds number flow effects around a vertical axis turbine at a range of tip-speed ratios
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Turbulence modelling of low Reynolds number flow effects around a vertical axis turbine at a range of tip-speed ratios

机译：在一定的叶尖速比范围内绕垂直轴涡轮的低雷诺数流动效应的湍流建模

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This paper presents a two-dimensional numerical investigation of a vertical axis turbine with focus on the prediction from two different turbulence modelling schemes. The three bladed turbine configuration tested is that of Roa et al. (2010) which has a high solidity of 1.1 and is tested at a chord-based Reynolds number of 1.5 × 10~5. Results are provided at three different tip speed ratios: the optimal value, and values 25% higher and lower. A detailed investigation of the flow ensues and results are presented as obtained from the original SST model and a modified version for low Reynolds number effects, recently tested by Wang et al. (2010) for a similar flow. Post-processing includes the evolution of the skin-friction coefficient over the blade throughout a cycle which enables a better understanding of the flow structure and the dynamic stall effects, as well as blade-vortex interaction. The low Reynolds number version of the model acts to reduce turbulence viscosity, leading to laminar flow at various parts of the cycle, which is seen to correctly enable the formation of leading edge vortices observed in the literature.
机译：本文介绍了垂直轴涡轮机的二维数值研究，重点是来自两种不同湍流建模方案的预测。测试的三叶片涡轮配置是Roa等人的配置。 （2010年）具有1.1的高硬度，并在基于弦的雷诺数1.5×10〜5下进行了测试。在三种不同的尖端速度比下提供结果：最佳值，以及更高和更低25％的值。流动的结果和结果的详细调查，是从最初的SST模型和低雷诺数效应的修改版本中获得的，最近由Wang等人进行了测试。 （2010年）为类似的流程。后处理包括整个循环过程中叶片上的皮肤摩擦系数的演变，这可以更好地了解流动结构和动态失速效应，以及叶片涡旋相互作用。该模型的低雷诺数版本可降低湍流粘度，从而在循环的各个部分导致层流，这可以正确地形成文献中观察到的前缘涡流。

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