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中文摘要：
为了深入研究风力机叶片的减阻方法及效果,本文探讨了涡流发生器对风力机专用翼型的气动性能的影响。研究对象为直叶片段,涡流发生器安装在叶片段20%弦长处,并采用CFD方法对光滑叶片段及安装涡流发生器后的叶片段分别进行了模拟,得到了翼型的气动特性曲线。对比14°攻角下的两种情况的流动特性,发现在大攻角的情况下,涡流发生器确实能够推迟流动分离,从而极大地减小翼型的阻力,并且增大了翼型的最大升力系数;其次,本文分析了涡流发生器对叶片段表面压力分布的影响,发现涡流发生器对下游方向的影响明显大于对上游区的影响,这一点与涡流发生器搅乱下游流场的作用是一致的;最后,本文分析了涡流发生器控制流动分离的机理。
英文摘要：
In order to investigate drag reduction method for wind turbine blades,effects on performance of wind turbine airfoils by vortex generators was analyzed by CFD method.The performance curve of an airfoil was worked out by simulating the a straight blade section with or without VGs placed on 20%chord.According to the flow conditions,VGs delayed the flow separation at large attack angle,for example 14°,so the drag was decreased greatly and the lift was improved dramatically.Additionally,it shows that the downflow region was influenced greatly by VGs from the distribution of pressure on suction surface.Finally,the mechanism on controlling flow separation by VGs was analyzed.
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