多段翼构型的积冰数值模拟

Numerical simulation of ice accretions on multi-element airfoils

基于非结构网格提出一种针对多段翼构型的积冰数值模拟方法.通过求解气体欧拉方程得到多段翼的绕流流场,基于空气绕流流场的气流速度分布,采用迭代法对水滴控制方程进行数值求解,得到多段翼各翼面的水滴收集特性;采用不同的积冰冻结模型模拟霜冰和明冰的冻结过程;利用冰层时间推进法模拟积冰过程,基于积冰法向生长假设生成积冰外形.对某典型三段翼霜冰和明冰的结冰情况进行了预测研究,根据多段翼的流场特点提出一种明冰冻结模型的求解思路,并分析了积冰对多段翼性能的影响.

A numerical method based on unstructured grids was proposed to simulate ice accretions on multi-element airfoils.The air flowfield was solved using the Euler equations.Based on air velocity distribution,the governing equations for droplets were solved using an iterative method to obtain the collection efficiency.The different freezing models corresponding to the rime and glaze ice were employed to simulate the freezing process.The process of ice accretions was simulated with the assumption that ice accumulates layer-by-layer,and the ice shape was built with the assumption that ice grows in the direction normal to the airfoil surface.The rime and glaze ice accretions on a typical three-element airfoil were investigated.According to the flowfield around the airfoil,a method of computing the freezing model for glaze ice was presented.The effects of ice accretions on performance of the multi-element airfoil were also analyzed.