摘要
为了保障乘客的安全,国内外学者针对吸雨问题已经展开了大量研究。在吸雨研究中应该确定吸雨量、水滴粒径和水滴速度。因此,本文基于CFX和Gasturb软件,采用欧拉-拉格朗日数值方法计算了飞机典型飞行工况下进气道的吸雨量、进口截面处水滴速度以及雨滴粒径的变化规律。数值计算结果表明,在起飞滑跑和下降滑跑的前期阶段中,发动机吸入的雨水含量小于自然环境中雨水含量。其中,颗粒越小,吸雨量越大,其余飞行工况中,发动机吸雨量大于自然环境中雨水含量。且颗粒越大,吸雨量就越大。所有典型计算工况下,当飞机下降高度为6000m、RR粒径为1.25mm时,吸雨量最大,最大吸雨量为5.67%。受飞机飞行速度和进气道入口气流速度的影响,不同飞行阶段中,颗粒轴向流入进气道的速度介于飞机飞行速度和进气道入口气流速度之间;受气动破碎和气流运动特性(溢出或者汇聚)的影响,不同的飞行阶段大颗粒和小颗粒的粒径变化规律明显不同,小颗粒粒径近似直线变化,大颗粒则变化较为剧烈。
In order to ensure the safety of passengers,a lot of researches have been carried out on the problem of rain ingestion at home and abroad.First of all,the rainfall,the droplet size and the droplet velocity should be determined.in the study of rain ingestion,Therefore,based on CFX and Gasturb software,the Eulerian-Lagrangian numerical method was used to calculate the variation of the inlet rainfall,the droplet velocity and the raindrop size at the inlet section under typical flight conditions.The numerical results show that the amount of rainwater absorbed by the engine is less than that in the natural environment during the early stages of takeoff and descent.Among them,the smaller the particles,the greater the water absorption.In other flight conditions,the rainfall absorbed by the engine is greater than that in the natural environment.And the rainfall absorption increases with the increase of particle size.The maximum absorption is 5.67%when the aircraft descends to 6000 m and the RR particle size is 1.25 mm.Due to the influence of aircraft flight speed and inlet airflow velocity,the variation law of particle velocity is different in different flight stages,but the axial velocity of particles flowing into the inlet is between the aircraft flight speed and the inlet airflow velocity;affected by aerodynamic fragmentation and airflow motion characteristics(overflow or convergence),the particle size changes of large particles and small particles is different in different flight stages,the particle size of small particles changes approximately linearly,while that of large particles changes more sharply.
作者
侯圣文
郑旭
马树波
庄倩杉
游国庆
张海
Wen-sheng Hou;Xu Zheng;Shu-bo Ma;Qian-shan Zhuang;Guo-qing You;Hai Zhang(College of Power and Energy Engineering,Harbin Engineering University;Nuclear Power Institute of China)
出处
《风机技术》
2020年第6期35-44,共10页
Chinese Journal of Turbomachinery
基金
黑龙江省自然科学基金项目(LH2020E066)。
