涡轮机
垂直轴风力涡轮机
旋转(数学)
井式水轮机
空气动力学
涡轮叶片
流利
转速
机械
扭矩
工程类
计算流体力学
结构工程
海洋工程
机械工程
物理
几何学
数学
热力学
作者
Xuejing Sun,Jianyang Zhu,Zongjin Li,Guoxing Sun
出处
期刊:Energy
[Elsevier]
日期:2021-01-01
卷期号:215: 119177-119177
被引量:28
标识
DOI:10.1016/j.energy.2020.119177
摘要
To improve the power extraction performance and self-starting characteristics of the vertical axis wind turbine (VAWT), the effect of offsetting pitching angles and blade numbers on the performance of a wind-induced rotation VAWT has been systematically investigated. Different from the conventional numerical and experimental approach, the rotation velocity of the turbine is driven by the aerodynamic torque of the blade in the present study. The flow around the turbine was simulated using Fluent 6.3 code, and the governing equation of the turbine’s rotation was coupled to the code through UDF. The optimized pitching angle β was found to be of −4°, at which the maximum 5.89 and 5.14 times average power increasing were achieved for the turbine with 5-blades and 3-blades, respectively. Moreover, shorter self-starting time was also observed for the turbine with β = −4° at larger wind velocity (>9 m/s). In addition, the influence of the blade number on the performance of the turbine depended on the wind velocity. The analysis of the flow field of the turbine showed that the offsetting pitching angle and blade number could suppress or delay the vortex separation, and therefore improve the overall performance of the turbine.
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