兆瓦级风力机结构风振系数取值探讨  

Study on Wind Vibration Coefficients of Megawatt Turbine Structures

作　　者：柯世堂[1] 王同光[1] 梁俊[1] 赵林[2] 

机构地区：[1]南京航空航天大学江苏省风力机设计高技术研究重点实验室,南京210016 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《防灾减灾工程学报》2014年第4期517-522,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家重点基础研究计划项目(2014CB046200);江苏省自然科学基金项目(BK2012390)资助

摘　　要：国内外关于风力机塔架设计中风振系数的取值一般不考虑叶片与塔架的结构与气动耦合作用。针对大型风力机系统风振多耦合效应和多振型响应特点,建立某兆瓦级风力机塔架-叶片系统有限元模型,采用改进的叶素-动量理论,模拟考虑旋转效应和塔架-叶片相干性的风力机系统脉动风速时程;基于风振精细化频域计算方法,进行风力机系统动力风振反应计算,探讨了叶片旋转效应的影响、风振系数的取值及其参数变化规律。研究结论为兆瓦级风力机风振系数的确定提供了科学依据。The wind field caused by structural and aerodynamic coupled effects of blades and tower were not considered in the wind vibration coefficients of wind turbine towers at home and abroad. Aiming at the multi-coupled effects and multi-mode buffeting responses, the integrated finite ele- ment model consisting of the rotor and the tower of megawatt wind turbine was established. The fluctuating wind velocity time history was simulated by the modified harmony superposition method and blade element momentum theory, which considering the blade-tower interaction. U- sing the refined calculating method ＂consistent coupled method＂, which could consider back- ground component, resonant component and cross effect, the wind-induced responses of wind turbine system were calculated, the influence of rotational effect from blades, the choice of value of wind vibration coefficient and its change regularity were discussed. The research conclusions propose the scientific basis for determining wind vibration coefficients of wind turbines.

关 键 词：风力机 塔架-叶片耦合 风振系数 风场模拟 参数分析 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程] TU279.74[建筑科学—建筑设计及理论]