应用混合网格分析复杂积冰翼型气动性能

Application of Hybrid Grid to Analyzing Complex Iced Airfoil Aerodynamic Performance

通过发展一种点-点对接的结构/非结构混合网格生成方法,避免了复杂积冰外形难以划分结构化网格的问题,并对复杂积冰翼型的气动性能进行了分析计算。在靠近积冰边界的内层采用了非结构网格以拟合复杂的边界,在非结构网格外采用结构化网格以节省存储空间和计算时间。为了检验网格对选用湍流模型的影响,整个流动区域分别采用SST和SA湍流模型,求解了雷诺平均N-S方程。数值计算结果表明SST模型更适于模拟复杂分离流动,积冰对翼型的气动性能造成了严重的影响。

A point-to-point structure/unstructured hybrid grid generation method is developed in this paper to avoid the difficulty of generating structure grid on complex iced airfoil, and the corresponding analysis of aerodynamic performance is carried out. An unstructured grid is imposed in the zone near the iced airfoil to fit the complex boundary. A structure grid is imposed in the zone wrapping the unstructured grid to save the storage and computational time. To verify the effect of grid on the use of turbulence model, the Reynolds-averaged N-S equations are solved with implementation of the SST and SA turbulence model in both types of grid. The results of numerical simulation show that the SST turbulence model is more suitable for the complex separated flow and the ice accretion has serious effect on the aerodynamic performance of airfoil.