风力机尾流场的实验研究

Experimental Research of Wind Turbine Wake Field

为了获得风力机的尾流场信息,同时为大型风力机的尾流场研究提供参考依据,利用轴流式风机提供来流风速,使用皮托管和手持风速仪对无风力机情况和单个小型风力机的尾流场进行测量,获得尾流区域的速度场、压力场以及诱导速度场的分布规律。结果表明:对于无风力机的情况,在同一测量断面处的风速随着半径的增加而逐渐减小;对于有风力机时,在同一测量断面处的风速随着测量半径的增加先增加后逐渐减小;对于不同测量断面,随着测量间距的增加,在同一角度的速度值的变化趋势逐渐变小。通过尾流的诱导速度曲线可以发现,在同一测量断面处的诱导速度随测量半径的增加呈下降趋势,而对于不同截面,同一角度的诱导速度曲线会相互交叉。

In order to get the information of the wind turbine wake field, and provide reference for the research of large scale wind turbine wake field, the wind velocity is provided by using axial flow fan, and the wake fields of no wind turbine and a single small wind turbine are measured by using pitot tube and handheld anemometer, then the distribution regularities of the velocity field, pressure field and the induced velocity field in wake zone are obtained. It turned out that the velocity decreases gradually with the increase of the radius at the same measurement section for the situation of no wind turbine. For the situation of a single wind turbine, the velocity first increases with radius grows then decreases gradually at the same mcas- urement section. For the different measurement sections, the variation trend of speed decreases gradually at the same angle with the increase of measurement distance. The curve of induced velocity shows the induced velocity decreases with the increase of the radius at the same t section. While the curve of induced velocity at the same measure angle for the different measurement sections will intersect with each other.