基于欧拉壁面液膜模型的三维热气防冰腔数值仿真

提出了一种基于欧拉壁面液膜（EWF）模型的热气防冰腔性能仿真计算的新方法。通过FLUENT软件用户自定义标量（UDS）框架求解水滴控制方程获取三维表面水滴撞击特性。通过对各微元的水收集率、水膜蒸发率等进行质量平衡分析得到了通过该微元的质量流量，并以此作为EWF模型质量流量边界条件进行空气驱动下三维水膜厚度分布的计算，进而建立了防冰表面水膜流动动态模型。在此基础上建立了适用于三维防冰表面的耦合换热模型，通过引入亚松弛因子实现了内外流场、水膜流动及蒙皮导热的松散耦合求解。通过对某发动机短舱模型三维算例计算结果的分析和对比，结果表明所采用的计算方法是合理可信的，可以用于三维防冰腔性能的计算。

Numerical simulation of 3D hot-air anti-icing chamber based on Eulerian wall film model

A new computation method of hot-air anti-icing chamber performance based on Eulerian wall film(EWF) model was presented in this paper.User defined scalar(UDS)of FLUENT software was used to calculate water droplet impingement efficiency by solving droplet governing equation.Mass balance analysis of water collection rate and film evaporation rate was performed to get the mass flow rate of each micro unit, which was used as boundary condition in calculating 3D film thickness distribution driven by air,and then the dynamic model of film flow on anti-icing surface was set up.Based on the above work,conjugate heat transfer model for 3D anti-icing surface was built,and under-relaxation factor was used in solving the loose coupling of inner/outer flow field,water film flow and skin heat conduction.The method of this paper was used in the cal-culation of a nacelle anti-icing chamber performance,and the results show good compliance with the physical phenomenon.The method in this paper can be used in 3D hot-air anti-icing chamber performance calculation.