H型垂直轴风力发电机气动性能分析

Analysis of Aerodynamic Performance of H-type Vertical Axis Wind Turbine

针对小型三叶片H型垂直轴风力发电机的气动性能,运用计算流体力学中的移动网格技术,对风轮二维及三维流域模型的非定常分离流动进行数值计算,分析风轮的流场特征,并研究不同环境因素对风轮气动性能的影响。计算结果表明:在洁净空气中,叶片在叶尖处的涡量最大,上游叶片尾流影响绕下游叶片空气的流动,下游叶片风能捕获减小,整个风轮的最大风能利用系数约为0.32;风沙环境下,叶尖处的涡量进一步增大,且涡量最大处在上翼面的后半段。

In view of the aerodynamic performance of small three-blade h-type vertical axis wind turbine,the moving grid technology in computational fluid dynamics was used to conduct numerical calculation on unsteady separated flows of the two-dimensional and three-dimensional watershed models of the wind turbine,to analyze the flow field characteristics of the wind turbine,to study the influence of different environmental factors on the aerodynamic performance of the wind turbine.The calculation results show that,in clean air,the vorticity of the blade at the tip is the largest,and the wake flow of the upstream blade affects the air flow around the downstream blade,so that the wind energy capture of the downstream blade is reduced,and the maximum wind energy utilization coefficient of the whole wind wheel is about 0.32.In the wind and sand environment,the vorticity at the blade tip increases further,and the maximum vorticity is in the second half of the upper plane.