涡扇发动机内外涵道水量分布比例数值仿真  

Numerical Simulation of Water Distribution Ratio in Inner and Outer Duct of Turbofan Engine

作　　者：薛文鹏[1] 宋江涛[1] 张琦[1] XUE Wen-peng;SONG Jiang-tao;ZHANG Qi(China Flight Test Establishment,Xi’an 710089,China)

机构地区：[1]中国飞行试验研究院,西安710089

出　　处：《航空发动机》2022年第3期7-12,共6页Aeroengine

基　　金：工信部民机科研基金资助。

摘　　要：涡扇发动机经常会在雨天执行飞行任务,当雨滴进入发动机后,由于风扇旋转、液滴和液滴碰撞、液滴与叶片壁面碰撞导致核心机与内外涵道之间的水量重新分配。针对雨滴在内外涵道的分配问题,采用了3维建模仿真方法计算水进入核心机的比例。通过拉格朗日法建立了两相流模型,同时考虑了液滴运动模型和破碎模型,研究了不同的水气比、初始液滴直径和风扇转速对内外涵道水量分配比例的影响。结果表明:进入核心机的水量取决于液滴的初始液滴直径和风扇速度,水气比对进入核心机的水量影响较小。将仿真计算结果与文献[6]中经验数据进行了比较,仿真最大误差为3.3%。证明所建立的涡扇发动机内外涵道水量分布比例数值仿真方法是合理的,对计算液滴量的内外涵道分配具有一定的参考价值。Turbofan engines often perform missions in rainy days.When raindrops entered the engine,the water between the core en⁃gine and the inner and outer ducts was redistributed due to the rotation of the fan,the collision between droplets and droplets,as well as the collision between droplets and blade wall.Aiming at the raindrops distribution in the inner and outer ducts,a three-dimensional modeling and simulation method was used to calculate the proportion of water entering the core engine.A two-phase flow model was established by Lagrangian method,and the droplet motion model and breakup model were considered.The effects of different water-air ratio,initial drop⁃let diameter and fan speed on the water distribution ratio in the inner and outer ducts were studied.The results show that the amount of wa⁃ter entering the core engine depends on the initial droplet diameter and fan speed,and the water-air ratio has little effect on the amount of water entering the core engine.The simulation results are compared with the empirical data in reference[6],and the maximum simulation error is 3.3%.It is proved that the numerical simulation method of the water distribution ratio in the inner and outer ducts of turbofan en⁃gine is reasonable,and has a certain reference value for calculating the droplets distribution in the inner and outer ducts.

关 键 词：两相流 水气比 初始液滴直径 水量分配比例 内外涵道 涡扇发动机 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]