文献类型：期刊文献

英文题名：Study on the Pitch Angle Effect on the Power Coefficient and Blade Fatigue Load of a Vertical Axis Wind Turbine

作者：Hao, Wenxing[1,2];Abdi, Abdulshakur[2];Wang, Guobiao[1,3];Wu, Fuzhong[2]

机构：[1]Tianjin Univ, Key Lab Mech Theory & Equipment Design, Minist Educ, Tianjin 300350, Peoples R China;[2]Shaoxing Univ, Sch Mech & Elect Engn, Shaoxing 312000, Peoples R China;[3]Tianjin Univ Zhejiang, Int Inst Innovat Design & Intelligent Mfg, Shaoxing 312077, Peoples R China

年份：2023

卷号：16

期号：21

外文期刊名：ENERGIES

收录：SCI-EXPANDED(收录号：WOS:001099434300001)、、EI(收录号：20234615066026)、Scopus(收录号：2-s2.0-85176374875)、WOS

基金：The authors gratefully acknowledge the technical support from senior engineer Xuyuan Gao of Zhejiang Shuaikang Electric Company Limited.

语种：英文

外文关键词：vertical axis wind turbine; pitch angle; power coefficient; blade fatigue load; vortex-blade encounter; computational fluid dynamics

外文摘要：For vertical axis wind turbines (VAWTs), the increase of the incoming wind speed higher than the rated value will make the tip speed ratio (TSR) lower and lower, resulting in the blade fatigue load becoming more and more severe and the power coefficient weakening gradually. This paper explores whether varying the pitch with the TSR decrease is necessary for improving the power coefficient and reducing the fatigue load. Specifically, the pitch angle effect on the power coefficient and fatigue load of a VAWT at different TSRs was studied by the computational fluid dynamics method. The results show that the optimal pitch angle in terms of the power coefficient varies with the TSR, which means that varying the pitch with the TSR decrease can improve the power coefficient. Meanwhile, the principle to guide the pitch variation is to avoid flow separation in the downwind zone and minimize the angles of attack (AoAs) in the upwind zone. At the lowest TSR of 1.7 in the present work, varying the pitch from the optimal one in terms of the power coefficient reduced the blade normal force amplitude significantly, which is mainly attributed to avoiding the vortex-blade encounter and minimizing the AoAs in the downwind zone. The vortex-blade encounter at the lowest TSR is an important phenomenon related to the variation of the blade torque and blade normal force and will weaken and disappear with the pitch angle increase.