基于激光雷达扫描数据的湍流强度影响下风力机尾流特性研究

STUDY ON INFLUENCE OF TURBULENCE INTENSITY ON WIND TURBINE WAKE CHARACTERISTICS USING LIDARS SCANNING DATA

以张家口市某风电场作为实验场地,利用激光多普勒雷达(WindMast WP350和Wind 3D6000分别扫描风力机的来流和尾流)对风力机的尾流以及风场风况进行测量,并分析湍流强度变化以及探究湍流强度对风力机尾流特性的影响。研究发现,随时间改变的大气环境对湍流强度的影响较为明显,而高度对湍流强度的影响较小;湍流强度对风力机尾流有较大影响,湍流强度越大,则尾流恢复越快且尾流宽度和深度越小;随着沿轮毂中心轴向距离的增加,尾流速度衰减在尾流发展4D^6D(D表示风力机直径长度)后加速下降。

A wind farm experiment was carried out in Zhangjiakou and the lidar(WindMast WP350 and Wind 3D6000)was used to measure the wind turbine wake and wind conditions.The change of turbulence intensity and the wind turbine wake characteristics are analyzed using measurement data.And the study shows that the influence of atmospheric environment changing with time on turbulence intensity is obvious,while the influence of height on turbulence intensity is not significant;secondly,the turbulence intensity has great influence on the wake flow of wind turbine,the greater the turbulence intensity is,the smaller the velocity deficit and the larger the width of the wake flow will be;at last,with the increase of the axial distance along the hub center,the wake width gets increased,and after reaching a certain distance(4D^6D,D is the diameter of the turbine),the wake flow will gradually dissipate.