不同材质风力机叶片绕流流场特征变化PIV实验研究

PIV EXPERIMENTAL RESEARCH ON CHARACTERISTIC CHANGE OF FLOW FIELD AROUND WIND TURBINE BLADES WITH DIFFERENT MATERIALS

考虑风力机叶片变形对绕流流场的影响,通过粒子图像测速(PIV)方法,采集两副翼型相同、材质分别玻璃聚酯(叶片Ⅰ)和玻璃聚醋内部填充泡沫(叶片Ⅱ)的水平轴风力机叶片绕流流场信息,对不同测试截面处流场数据进行分析。研究结果表明:相比于叶片Ⅰ,相同工况下,叶片Ⅱ的总体涡量、回流区的面积和时均速度更大,轴向雷诺应力更小;随着相对轴向距离的增加,时均速度在相对高度方向波动减小,材质对轴向雷诺应力影响逐渐减弱。实验工况下,叶片材质对绕流流场特征的影响大于叶尖速比对其的影响,并沿径向方向有增大的趋势。

Considering the effect of the deformation of wind turbine blades on the surrounding flow field,the particle image velocimetry(PIV)method is used to collect the surrounding flow field information of two horizontal axis wind turbine blades with the same material but different aileron shapes,namely glass polyester(blade Ⅰ)and glass polyester filled with foam(blade Ⅱ),so as to analyze the flow field data at different test sections. The research results show that compared with blades Ⅰ,the average vorticity,the area of the recirculation zone and the time-averaged velocity of the blade Ⅱ are larger,and the axial Reynolds stress is smaller under the same working conditions. With the increase of the relative axial distance,the fluctuation of the time-averaged velocity in the relative height direction decreases,and the influence of the material on the axial Reynolds stress gradually weakens. Under the test conditions,the influence of the blade material on the characteristics of the surrounding flow field is greater than the influence of the tip speed ratio on it,and it has a tendency to increase in the radial direction.