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中文摘要：
采用基于k-ωSST湍流模型的Gamma-Theta转捩模型对S809翼型和NREL Phase VI叶片进行了考虑转捩的气动力数值模拟,研究了转捩对其气动特性特别是失速特性的影响。首先对S809翼型在迎角0°～30°范围内开展了数值模拟,比较了转捩模拟和全湍流模拟获得的翼型升力系数和流场特征,发现前缘层流分离泡的存在显著影响了翼型的失速特性;然后对NREL Phase VI叶片开展了类似的数值模拟,结果显示转捩对叶片失速特性和翼型失速特性产生影响的作用方式是相似的。经过对以上数值模拟结果加以分析认为,转捩对翼型和叶片失速特性的影响主要通过前缘层流分离泡的作用体现出来,前缘层流分离泡的存在使翼型和叶片更早地进入深失速。
英文摘要：
A numerical analysis for S809 airfoil and NREL Phase VI blade has been made to investigate laminar/turbulence transition effect on stall performance of wind turbine airfoils and blades.The transition prediction method is Gamma-Theta model coupled with k-ω SST turbulence model.Firstly,simulations with transition prediction and full turbulence are conducted for S809 airfoil in a range of angles of attack of 0°~30°.It is showed that there is a significant impact on the airfoil＇s stall performance by the laminar separation bubble near leading-edge.Subsequently,a similar numerical analysis is performed for the NREL Phase VI blade.It is found that the way of impact on stall performance of the blade is similar to that of the airfoil.For both the airfoil and blade,transition＇s effect on stall performance mainly depends on the existence of the laminar separation bubble near leading-edge,which makes the deep stall come earlier.
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