低速工况下航空发动机轴承腔壁面油膜运动分析  

Analysis of Wall Oil Film Motion of Aero-engine Bearing Chamber in Low-speed Condition

作　　者：刘亚军[1] 陈国定[1] 王军[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《机械科学与技术》2010年第7期897-901,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(50975233)资助

摘　　要：航空发动机轴承腔壁面油膜运动特性的研究对于轴承腔散热设计起着非常重要的作用。笔者针对轴承腔低速工况,结合国外已有试验工作,提出描述油膜速度和油膜厚度的分析方法,并进行若干工况条件的分析。研究结果表明,在低速条件下,油膜厚度和油膜平均速度均自轴承腔排气口到排油口逐渐增大且和滑油供油量成正比,重力和油膜/空气界面剪切力的共同作用使得油膜在排油口两侧流动方向相反且数值上有差异。理论分析与试验工作的比较表明,笔者提出的低速工况下轴承腔壁面油膜分析方法是可行的,分析工作对于揭示轴承腔壁面油膜运动机理、进行轴承腔润滑设计和传热分析,都是有工程应用价值的。Movement characteristics of wall oil film for the thermal design plays an important role in aero-engine bearing chamber.Under low-speed bearing chamber conditions and using existing experimental results,we analyzed the film velocity and film thickness and carried out the impact analysis of some operation conditions.The results show that under low-speed conditions,film thickness and film mean velocity increase between vent port and scavenge port and is directly proportional to the volume of oil supply;the combined effect of gravity and film/air interfacial shear force make film flow in opposite directions on both sides of the port and there are differences in values.Theoretical analysis and comparison with the experimental work show that the proposed analysis method of wall oil film motion under low-speed conditions in bearing chamber is feasible for revealing the wall film motion mechanism and for lubrication design and heat transfer analysis of bearing chamber.

关 键 词：航空发动机 轴承腔 油膜厚度 油膜速度 

分 类 号：TH122[机械工程—机械设计及理论]