Numerical simulation on flow field characteristics of a double-layer counter-rotating vertical axis wind turbine

被引：0
|
作者：
Xu W.-H. [1 ]
Qiu Z. [1 ]
Yu B.-P. [1 ]
Wang F.-X. [1 ]
机构：
[1] School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2019年 / 53卷 / 11期
关键词：
Counter-rotating; Double-layer wind turbine; Dynamic stall; Phase difference; Tip speed ratio; Vertical axis wind turbine;
D O I：
10.3785/j.issn.1008-973X.2019.11.021
中图分类号：
学科分类号：
摘要：
Aiming at the low power coefficient problem caused by dynamic stall during the operation of vertical axis wind turbines (VAWTs), a double-layer counter-rotating VAWT was proposed. By setting the counter-rotating auxiliary blade in the inner of the traditional VAWT, the flow field of the VAWT is improved, thereby the power coefficient is increased. The computational fluid dynamics (CFD) numerical simulation of the proposed wind turbine and traditional VAWT has been carried out. The difference between the flow field characteristics of the two wind turbine configurations under different tip speed ratios (TSRs), and the influence of the initial operating phase difference between inner and outer layers of the double-layer wind turbine were studied. Results show that the time-averaged torque coefficient of the inner auxiliary blade is positive, and extra power input is not required. Results of the torque coefficient of the outer blade show that the arrangement of the proposed wind turbine improves the time-averaged power generation efficiency by reducing the peak value of torque coefficient of the main blade in the upstream, as well as greatly improving the torque coefficient of the main blade in the downstream. The vortex structure in the flow field was analysed, and the results indicates that the main reason for the increase of torque coefficient is that the inner auxiliary blades restrain the dynamic stall phenomenon of the main blade. Especially when the tip speed ratio was 1.85 and the phase difference was 90°, the time-averaged torque coefficient of the main blade of the proposed configuration was increased by 43.92%, compared with that of the traditional VAWT. © 2019, Zhejiang University Press. All right reserved.
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页码：2223 / 2230
页数：7
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