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Performance improvement of Savonius rotor using multiple quarter blades - A CFD investigation

机译：使用多个四分之一叶片改进Savonius转子的性能-CFD研究

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摘要

Savonius rotor is preferred for many power generation applications like tidal, wind and hydro, especially on a small scale by virtue of its simple and inexpensive construction, installation and maintenance. Present study is focussed on the estimation and comparison of the performance in terms of Coefficient of Performance (COP) of a new configuration of Savonius rotor with the conventional one, using numerical simulation approach. New configuration comprises multiple quarter blades added to conventional configuration. A methodology for the numerical simulation of Savonius rotor is developed and validated, that can be employed for comparative study of different design configurations for design based optimization of Savonius rotor. Accuracy of the simulation results, despite of correct methodology, is dependent on accurate estimation of turbulence and meshing parameters. Present work employs Shear Stress Transport (SST) model for modelling turbulence which incorporates the near wall fluctuation capturing capability of k-omega model and robust k-epsilon model for modelling the bulk domain. Meshing parameters include correct estimation of first layer thickness for boundary layer on the blades based on the desired y(+) value. An improvement in Coefficient of Performance ranging between 8.89% and 13.69% for different inlet velocities is observed for new configuration over the conventional configuration. (C) 2016 Elsevier Ltd. All rights reserved.
机译：Savonius转子因其简单，廉价的构造，安装和维护而特别适用于小规模的许多发电应用，例如潮汐，风力和水力发电。目前的研究集中在使用数值模拟方法，对Savonius转子与传统转子的新配置的性能系数（COP）进行性能估计和比较。新配置包括添加到传统配置中的多个四分之一刀片。开发并验证了Savonius转子数值模拟的方法，可用于对不同设计配置进行比较研究，以对基于Savonius转子的设计进行优化。尽管采用了正确的方法，仿真结果的准确性仍取决于湍流和啮合参数的准确估计。目前的工作采用剪切应力传输（SST）模型对湍流进行建模，该模型结合了k-ω模型的近壁波动捕获能力和鲁棒的k-ε模型对整体域的建模能力。网格划分参数包括基于所需的y（+）值正确估计叶片边界层的第一层厚度。对于新配置，与传统配置相比，对于不同的进口速度，可以看到性能系数在8.89％和13.69％之间的改善。 （C）2016 Elsevier Ltd.保留所有权利。

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