摘要
风电场发电量受风力机尾流影响明显,为了更加准确地计算风电场的尾流风速的分布,探讨了风电机组尾流效应对风电场设计和运行的重要影响.采用大涡模拟和致动线模型的CFD方法,分析不同风廓线条件下风力机尾流的特性.研究重点考虑了塔架的影响,并针对不同粗糙度对风力机尾流分布及速度亏损的变化规律进行了深入分析.结果表明,塔架促进了叶根涡和叶尖涡的混合及破裂,导致近尾流区在水平和垂直方向上的风速分布出现显著的不对称性.此外,随着尾流向下游延伸,这种不对称性更为明显.研究还发现,随着粗糙度的增加,横向和纵向的速度亏损加剧,尾流恢复速度减慢.这项研究为风电场的设计和运行提供了重要的理论依据和技术参考,有助于优化风电机组的布局和提高风电场的整体效率.
The electric power generation of wind farms is significantly affected by the wake of wind turbines.To more accurately calculate the distribution of wake wind speed in wind farms,the important impact of wind turbine wake effects on the design and operation of wind farms was explored.Using computational fluid dynamics(CFD)methods that incorporate large eddy simulation(LES)and an actuator line model,the characteristics of wind turbine wakes under various wind profile conditions were analyzed.Specifically,the influence of the tower structure was focused on,and an in-depth analysis how different levels of surface roughness affected the distribution and velocity deficit of the wind turbine wakes was conducted.The results indicate that the tower facilitates the mixing and breakup of root and tip vortices,leading to significant asymmetry in the wind speed distribution along both horizontal and vertical directions in the near wake region.This asymmetry becomes more pronounced as the wake extends downstream.Furthermore,an increase in surface roughness exacerbates the lateral and longitudinal velocity deficits,slowing down the recovery of wake velocity.Overall,this research provides crucial theoretical and technical insights for the design and operation of wind farms,aiding in optimizing the layout of wind turbines and enhancing the overall efficiency of the wind farms.
作者
吴雨晴
赵振宙
李文锋
王丁丁
郭鹏
徐志轩
WU Yuqing;ZHAO Zhenzhou;LI Wenfeng;WANG Dingding;GUO Peng;XU Zhixuan(Datang Renewable Energy Experimental Research Institute Co.,Ltd.,Beijing 100049,China;New Energy College,Hohai University,Changzhou,Jiangsu 213200,China;Sany Heavy Energy Co.,Ltd.,Beijing 102206,China)
出处
《排灌机械工程学报》
北大核心
2025年第12期1236-1244,1253,共10页
Journal of Drainage and Irrigation Machinery Engineering
关键词
风力机
尾流亏损
入流条件
粗糙度
wind turbines
wake loss
inflow conditions
roughness
