升阻复合型垂直轴风力机叶片与涡的相互干扰研究

Study of Mutual-Interference Between the Blade and the Vortex in the Lift-Drag Type Vertical Axis Wind Turbine

升阻复合型垂直轴风力机(VAWT)兼具升力型垂直轴风力机风能利用率(Cp)高以及阻力型垂直轴风力机启动性能好的优点。通过研究不同叶尖速比、不同弦长条件下的流场结构,分析叶片与涡的相互作用,揭示了该类风力机的做功机理,解释了不同条件下风力机风能利用率不同的原因。分析结果表明,风力机的涡量对其风能利用率具有直接影响,减小脱落涡可以提升风力机的风能利用率;通过涡量云图分析出的风能利用率与计算得出的风能利用率是相吻合的。

The lift-drag type vertical axis wind turbine （ V A WT ） has the advantages of the high power coefficient （ Cj,） by the lift-type VAWT and the good starting performance by the drag-type VAWT. Through researching the flow field structure under the different tip speed ratio and different chord lengths and analyzing the interaction of the blade and the vortex, the work mechanism of this kind of turbines was revealed and the reason why the power coefficient of turbine was different in different conditions was explained. The results of the analysis showed that the vorticity of wind turbine had a direct influence on the power coefficient （Cp）, and decreasing the vortex could promote the Cp of wind turbine. Through analyzing the vorticity contours it deduced that Cp was consistent with the calculated Cp.