基于动网格技术水平轴风力机叶片及尾迹流场旋涡特性  

Vortex characteristics of horizontal axis wind turbine blade and wake flow field based on dynamic mesh

作　　者：高伟 张立茹[1,2] 姚慧龙 闫蓉 GAO Wei;ZHANG Liru;YAO Huilong;YAN Rong(College of Energy and Power Engineer,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China;Key Laboratory of Wind Energy Technology,Ministry of Education,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China)

机构地区：[1]内蒙古工业大学能源与动力工程学院,内蒙古呼和浩特010051 [2]风能太阳能利用技术教育部重点实验室(内蒙古工业大学),内蒙古呼和浩特010051

出　　处：《排灌机械工程学报》2023年第2期172-178,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：内蒙古自然科学基金资助项目(2020MS05067);国家自然科学基金资助项目(52066013)。

摘　　要：为了研究风力机流场中涡的产生及演化过程,采用动网格技术中的重叠网格方法对水平轴风力机流场进行计算,利用Q准则对叶片表面、叶尖涡及中心涡涡旋结构进行可视化分析,并将计算结果与相同工况下滑移网格计算结果进行对比分析.结果表明:对比2种方法在不同截面的叶片表面涡量分布,动网格方法计算得出在吸力面流动分离区域更大,能够捕捉到更多叶片表面边界层分离的细节;叶尖涡在向下游运动过程中将出现“叶尖涡跳跃”现象;中心涡在尾迹流场中涡量分布呈双峰状,在风轮后0.5D~2.0D内,叶尖涡与中心涡发生混合扩散;动网格与滑移网格计算得出尾迹流场中,中心涡分布趋势基本一致,采用动网格方法得出涡量峰值更大,采用滑移网格方法得出中心涡更早发生扩散.相较于滑移网格方法采用动网格方法研究风力机流场中的涡会更具优势.In order to study the generation and evolution process of vortices in the flow field of wind turbines, the overlapping grid method in the dynamic mesh technology was droped to calculate the flow field of horizontal axis wind turbines, and the Q criterion was used to carry out visual analysis on the structure of blade surface, tip vortex and central vortex, and the calculated results with those calculated by sliding mesh under the same working condition were compared. The results show that by comparing the vorticity distribution of blade surface with the two methods in different sections, the flow separation area on suction surface is larger and more details of boundary layer separation on blade surface can be captured by the dynamic mesh method. The ″tip vortex jump″ phenomenon occurs when the tip vortex moves downstream. In the wake flow field, the vortex distribution of the central vortex is bimodal. In the range of 0.5D-2.0D behind the wind turbine, the tip vortex and the central vortex have mixed diffusion. The distribution trend of the central vortices in the wake flow field is basically the same according to the calculation of the dynamic grid and the sliding grid. The vortex peak value is larger according to the dynamic grid method, and the central vortices are diffused earlier according to the sliding grid method. Compared with the sliding mesh method, the dynamic mesh method is more advantageous to study the vortices in the flow field of wind turbines.

关 键 词：水平轴风力机 动网格 叶尖涡 中心涡 涡量 

分 类 号：TK89[动力工程及工程热物理—流体机械及工程]