轴承腔油滴碰撞腔壁沉积特性分析  

Deposition characteristic of the oil droplet on housing in a bearing chamber

作　　者：王莉娜[1] 陈国定[1] 孙恒超[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《哈尔滨工业大学学报》2017年第1期144-149,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(51275411)

摘　　要：为提供轴承腔油膜流动状态分析所需基础参数,提出考虑温度条件的轴承腔油滴碰撞腔壁沉积特性分析模型.梳理油滴碰撞腔壁沉积准则,在考虑油滴温度变化的条件下,确定不同碰撞现象时油滴碰撞腔壁沉积质量和动量特性.以油滴碰撞腔壁时对腔壁的冷却效率为基础,借助热量守恒条件推导油滴碰撞腔壁的沉积热量特性.讨论温度效应、转子转速、油滴直径以及进气温度等参数对油滴碰撞腔壁沉积特性的影响.计算结果表明:考虑油滴在腔内运动温度效应后,油滴碰撞腔壁的质量沉积率和动量沉积率均略有降低;转子转速以及油滴直径增加后,油滴碰撞腔壁的质量、动量和热量沉积率均有所降低;随着进气温度的增加,油滴的热量沉积率增加.An analysis model about the deposition characteristics of oil droplet on the housing in a bearing chamber is proposed to provide the basic conditions of oil film flow investigation. Firstly,the transition criteria for droplet/housing interaction is determined,and considering the temperature variation of droplet,the deposition mass and momentum of oil droplet on housing are obtained for different impact phenomena. Secondly,the deposition heat energy is calculated based on the law of conservation of energy and the cooling effectiveness of oil droplet impacting on chamber housing. Lastly,the effects of droplet temperature,shaft rotational speed,droplet diameter and air inlet temperature on the deposition characteristics are discussed. The calculated results show that,after considering the temperature variation of droplet,the rates of deposition mass and momentum are all decreased; The rates of deposition mass,momentum and heat are all decreased with the increasing of shaft rotational speed and droplet diameter,and the rate of deposition heat is increased with the increasing of air inlet temperature.

关 键 词：航空发动机 轴承腔 油滴 换热 沉积 热量 

分 类 号：V233.4[航空宇航科学与技术—航空宇航推进理论与工程]