计算模型维数对风力机翼型气动性能预测的影响

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。

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

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.