计算模型维数对风力机翼型气动性能预测的影响

Effects of the Calculation Models with Different Dimension on the Aerodynamic Performance Prediction for Wind Turbine Airfoil

为了研究二维与三维计算对风力机翼型气动性能预测的影响,采用数值求解N-S方程的方法,对DU93-W-210二维翼型和三维直叶片进行了数值模拟,并将气动性能的计算结果与实验值进行比较。结果表明:当翼型表面气流未发生分离时,二维翼型与三维直叶片周围的流场结构相同,二者之间的气动性能无明显差异,三维直叶片可被简化为二维翼型;当气流分离时,三维直叶片周围的流场结构具有明显的三维流动效果,气动性能更接近实验值,三维直叶片不能简化为二维翼型,而且三维直叶片的展向长度不宜过小,取2～4倍弦长为最佳。

In order to analyze the influence of different dimensions on aerodynamic performance prediction of wind turbine airfoil,the flow fields surrounding 2-D airfoil of DU93-W-210 and 3-D straight blade were simulated by solving the N-S equations.Experimental results were compared to predict aerodynamic performances.The results revealed that if the flow did not separate,the aerodynamic performance and streamline between the 2-D airfoil and 3-D straight blade were similar,and the 3-D straight blade could be simplified into 2-D airfoil.If it separated,the flow field of 3-D straight blade had significant 3-D flow effects,the predicted aerodynamic performance was closer to experimental value than 2-D airfoil,but the 3-D straight blade could not be simplified into 2-D airfoil.The best span wise length of 3-D straight blade was 2～4 times of the chord.