高海拔单台大型风力机外场实验

Single large wind turbine field experiment at high altitude

为了提高高海拔地区大型风力机的性能,以3.3 MW水平轴风力机为研究对象,通过外场实验的方法,利用机舱式激光雷达测量风力机的入流,同时,利用地面风廓线雷达测量风力机的尾流.首先将一天中激光雷达测得的入流风速和风向与机舱上的风速风向计数据对比,并提取一段时间内机舱雷达测得的入流风速进行分析;其次,把尾流风向与入流风向、尾流速度廓线与入流速度廓线作对比.结果表明:激光雷达测得入流风速与机舱风速风向计数据有较强的相关性,机舱雷达对风偏差总体水平较风速风向计对风偏差略小,且入流风速会随着距风轮的距离减小而不断衰减;尾流主风向分布与入流主风向一致;随着下游测点距风轮位置的增加,尾流速度亏损恢复也越来越快.

In order to improve the performance of large-scale wind turbines in high-altitude areas,the 3.3 MW horizontal-axis wind turbine is taken as the research object.The inflow of wind turbines is measured by the Nacelle-type Lidar measures through the field experiment method.At the same time,the wind turbine wake is measured by the ground wind profile Lidar.Firstly,the inflow wind speed and wind direction measured by the Lidar in one day are compared with the wind speed and wind direction meter data on the nacelle,and the inflow wind speed measured by the Nacelle-type Lidar is extracted for a period of time.Secondly,the wake wind direction is compared with the inflow wind direction,the wake velocity profile and the inflow velocity profile.The results show that the inflow velocity measured by the Lidar has a strong correlation with the nacelle anemometer.The overall level of the wind deviation of the nacelle is slightly smaller than that of the anemometer,and the inflow wind speed will decrease with the distance from the rotor.The main wind direction distribution of the wake is consistent with the main wind direction of the inflow.With the increase of the position of the downstream measuring point from the wind wheel,the recovery of wake velocity loss is getting faster and faster.