摘要
以南京航空航天大学自主研发的5 MW水平轴风力机为研究对象,首先基于CFD技术模拟了不同偏航角(0°、5°、10°、20°、30°和45°)下风力机体系周边风场,验证风场有效性后添加离散相模型(DPM)并进行风-雨双向耦合迭代计算,然后对比研究不同偏航角对塔架和叶片表面风驱雨量、雨滴附加作用力以及等效压力系数等的影响规律。在此基础上,结合有限元方法重点对风作用和风雨共同作用下不同偏航角工况的大型风力机体系结构响应、屈曲稳定以及极限承载能力等进行定性和定量的对比分析。研究表明:偏航角的改变会显著影响风力机体系的流场特性与受力性能,风-雨荷载共同作用增大了体系结构位移以及内力响应,同时降低了风力机整体屈曲稳定和极限承载能力。上述结论可为此类风力机在极端气候和复杂工况下的荷载预测提供参考。
Taking a 5 MW horizontal wind turbine developed independently by Nanjing University of Aeronautics and Astronautics as an example,the flow field of wind turbine considering different yaw angles(0°,5°,10°,20°,30° and45°)was simulated based on the computational fluid dynamics(CFD)method firstly. And the discrete phase model(DPM)was added and the iterative computations of rain and wind loads were carried out after the effectiveness of the numerical simulation being verified. And then the influence sales of different yaw angles on wind-driven rainfall,raindrop additional force and equivalent pressure coefficient on tower and blades were studied. On the basis of this,the structural responses,the buckling stability and the ultimate bearing capacity of large wind turbine were carried out the qualitative and quantitative analysis for different yaw angles by the finite element method under wind load action and simultaneous actions of wind and rain loads. Studies show that the flow field characteristics and mechanical properties caused by wind and rain loads of wind turbine are significantly affected with the change of yaw angles. The displacement and internal force responses of wind turbine system are increased under simultaneous action of wind and rain loads. And then the buckling stability and ultimate bearing capacity of wind turbine are reduced under simultaneous action of wind and rainloads. The conclusions can provide references for load forecast of such wind turbines under extreme climates and complex conditions.
作者
余文林
柯世堂
叶泽华
徐海斌
陈淼
杨青
Yu Wenlin;Ke Shitang;Ye Zehua;Xu Haibin;Chen Miao;Yang Qing(Department of Civil Engineerings Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Jiangsu Key Laboratory of Hi-Tech Research for Wind Turbine Design,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2020年第10期236-245,共10页
Acta Energiae Solaris Sinica
基金
国家自然科学基金NSFC-RGC合作研究项目(51761165022)
国家重点研发计划(2019YFB1503700,2017YFE0132000)
江苏省青蓝工程优秀青年骨干教师培养计划。
关键词
风力机
计算流体动力学
结构分析
风雨耦合
偏航效应
稳定性能
wind turbines
computational fluid dynamics
structural analysis
wind and rain coupling
yaw effect
stability property