不确定湍流对低雷诺数风力机翼型气动特性影响研究

INFLUENCE OF UNCERTAIN TURBULENCE ON AERODYNAMIC CHARACTERISTICS OF LOW REYNOLDS NUMBER WIND TURBINE AIRFOIL

为分析并量化不确定湍流对低雷诺数风力机翼型气动性能的影响,以风力机翼型S809为研究对象,基于非嵌入式概率配置点法和修正转捩Transition SST模型,分析湍流强度对低雷诺数翼型升阻气动特性、层流分离和失速分离的影响规律,并量化随机湍流不确定性对翼型气动性能的影响。结果表明,湍流强度由0.2%增大至25%,翼型最大升阻比降低51.8%,湍流作用下层流分离泡消失,失速分离延迟;湍流强度标准差由10%增加至35%,翼型升阻比标准差最大增幅为14.43%。

In order to analyze and quantify the effect of uncertain turbulence on aerodynamic performance of low Reynolds number wind turbine airfoils,taking wind turbine airfoil S809 as the research object,the influence of turbulence on the aerodynamic characteristics,laminar flow separation and stall separation of low Reynolds number airfoil was studied based on the modified transition SST turbulence model and the non-intrusive probabilistic collocation method,and the influence of turbulence uncertainty on airfoil aerodynamic performance was quantified.The results showed that the turbulence intensity increases from 0.2%to 25%,the maximum lift drag ratio of the airfoil decreases by51.8%,the laminar bubble disappears and the stall separation delays.The standard deviation of turbulence intensity increases from 10%to 35%,the maximum standard deviation of lift drag ratio increases by 14.43%.