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在风洞开口实验段,应用PIV锁相周期采样技术测试风力机近尾迹速度场,通过分析速度场和涡量场,得到近尾迹流场结构特征。近尾迹中存在具有形态特征强烈的叶尖涡结构向下游不断传播。由风轮旋转轴向外,近尾迹的结构组成依次为中央尾迹区、叶尖涡诱导效应区和外部主流区。在叶尖涡诱导效应区内,涡流诱导效应使流场中存在明显的速度增益区和速度亏损区,且增益区和亏损区关于叶尖涡核中心对称。在研究区域内,叶尖涡向下游运动的轴向位移与尖速比成反比,径向位移与尖速比成正比,使叶尖涡诱导效应区影响范围随尖速比的增加径向扩展、轴向缩小。
In the experimental section of wind tunnel opening, the PIV phase-locked period sampling technique is used to test the near-wake velocity field of wind turbine. By analyzing the velocity field and vorticity field, the structural characteristics of the wake field are obtained. There is a vortex structure in the near wake with strong morphological features propagating downstream. From the rotation axis of the wind turbine, the structure of the near wake is followed by the central wake region, the tip vortex induced region and the outer mainstream region. In the vortex inducing effect region of vortex tip, the vortex induced effect has obvious velocity gain region and velocity loss region in the flow field, and the gain region and the loss region are symmetrical about the tip vortex nucleus center. In the study area, the axial displacement of tip vortex to downstream motion is inversely proportional to tip velocity ratio, and the radial displacement is proportional to tip velocity ratio, so that the influence range of tip vortex induction area expands radially with the increase of tip velocity ratio , Axial reduction.