中文摘要：

采用轴编码器锁相周期采样技术，在风洞开口实验段对旋转风力机叶片动态绕流结构进行了PIV实验，通过Insight 3G平均背景消噪和相关分析获得速度矢量信息，应用Tecplot处理得到相应的流线和速度云图。初步揭示了叶片动态绕流的特征变化及其绕流结构随风轮转速的变化规律，并探索了流动特征与风轮功率系数的对应关系。由于附着涡的诱导效应，翼型下游存在速度亏损区。随着转速的增加，附着涡影响区域增大，翼型下游速度亏损区域增大，亏损幅度也增大。在绕流结构中，切向速度分量占主导地位，轴向速度分量较小。叶片动态绕流特征的研究为分析风轮流场涡系的干涉及叶片动态失速等复杂流动问题提供了实验基础。

英文摘要：

The PIV measure on dynamic flow around a blade of the rotating wind turbine was carried out using axis-coder phase-locked periodic sampling technology at wind tunnel opening. The velocity vector information was obtained by correlation analysis and eliminating average background noise by Insight 3G. The streamlines and velocity contour were obtained by Tecplot. The characteristic of dynamic flow around a blade and its variation with rotor speed increasing were investigated. Relationship between flow characteristic and rotor power coefficient was explored. There is a trailing vortex induced velocity defect region at airfoil downstream flow field. The trailing vortex influence region, the velocity defect region and velocity defect value increase with rotor speed. In the dynamic flow around a blade, tangential velocity components are predominant and the axial velocity components are less. The dynamic flow research provides foundation for complex flow experiment, such as the rotor vortex system interference, the blade dynamic stall and so on.