摘要
叶素-动量理论是一种基于二维平面的近似理论,未考虑三维旋转效应和非定常因素,存在一定的局限性,随着风电技术的快速发展,机组尺寸组件增加,风轮直径逐步增大,这种局限性日益突出。对兆瓦级风力机进行整机的双向流固耦合分析,在一定程度上能弥补这种局限性。基于ANSYS Workbench 2020R1软件搭建流固耦合分析平台,采用RNG k-ε模型和滑移界面技术,对美国国家可再生能源试验(NREL)定义的5MW离岸风力机进行整机的双向流固耦合分析,并将结果与单向流固耦合分析进行对比。研究结果表明:在11.4m/s的额定风速下,整机的最大应力192MPa出现在机仓与塔架的连接处;从前缘到尾缘方向叶片位移逐渐增加,呈现非线性分布;翼弦展向2/3左右处出现应力集中现象;对风力机整机进行双向的流固耦合分析,可为风力机的设计提供更加真实可靠的数值模拟结果。
The Bladeelement momentum theory is an approximate theory based on two-dimensional space,without taking into account the three-dimensional rotation effect and non-constant factors,there are certain limitations,with the rapid development of wind power technology,the overall size of the unit gradually increases,the diameter of the wind turbine gradually increases,this limitation is increasingly prominent.The two-way fluid-silid coupling analysis of the whole MW wind turbine can,to some extent,compensate for this limitation.A fluid-structure interaction analysis platform was buildt based on ANSYS Workbench 2020R1 software,using the RNG k-εmodel and sliding-interface technique,the whole machine fluid-structure interaction analysis calculation for a 5MW offshore wind turbine defined by the US national renewable energy laboratory(NREL)was carried out,and the results were compared with the one-way fluid-solid coupling analysis.The research results show that:under the rated wind speed of 114m/s,the maximum stress of the whole machine appears at the connection between the aero-space and the tower,up to 192MPa;the blade deformation gradually increases from the leading edge to the trailing edge,showing a nonlinear distribution;the stress concentration phenomenon appears at about 2/3 of the wing chord;the two-way fluid-solid coupling analysis of the whole wind machine can provide more reliable numerical simulation results for the wind machine design.
作者
王辉
杜文风
赵艳男
王英奇
高博青
WANG Hui;DU Wenfeng;ZHAO Yannan;WANG Yingqi;GAO Boqing(College of Civil and Architecture Engineering,Henan University,Kaifeng 475004,China;Department of Building Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《建筑结构》
北大核心
2023年第22期92-97,共6页
Building Structure
基金
国家自然科学基金(U1704141)。
关键词
风力机
双向流固耦合
整机
全尺寸
滑移网格
wind turbine
two-way fluid-solid coupling
full machine
full-scale
sliding-interface
