摘要
针对航空发动机轴承腔滑油回收和冷却困难等问题,对现有轴承腔回油结构进行了改进,基于VOF多相流模型,采用CFD软件对腔内油气两相流动及换热进行瞬态数值模拟,分析了回油槽结构参数对腔内滑油滞留体积分数、回油比和壁面对流换热系数的影响.结果表明:随着转速增大,轴承腔的回油能力呈下降趋势,而壁面换热能力逐渐增强;随着槽宽的增加,滑油滞留体积分数先减小后增大,而回油比逐渐增大;随着槽深的增加,滑油滞留体积分数逐渐减小,回油比呈增大趋势;相比于基础模型,窄槽(w=1.0)和浅槽(h=1)能有效提高轴承腔壁面换热能力;适当调整回油槽位置可提高轴承腔回油与换热性能.
To solve the difficulty of oil scavenge and cooling in bearing chamber of aero-engine, the scavenge sump was improved. The effects of the sump structure parameters on oil residence volume fraction(φ_R), scavenge ratio and convection heat transfer coefficient of the wall were investigated by the volume of fluid(VOF) method in CFD software. The numerical simulation shows that with the increasing of shaft speed, the oil scavenge ability of bearing chamber is decreased, and the heat transfer ability of the wall surface is increased gradually. With the increasing of sump width, φ_R is decreased with latter rising, while the scavenge ratio is increased monotonously. φ_R is decreased, and scavenge ratio tends to increase with the increasing of sump depth. Compared with the basic model, the narrow sump(w=1.0) and the shallow sump(h=1) can effectively improve the heat transfer capacity of the wall surface. Appropriate adjustment of the sump position can improve the oil scavenge and heat transfer performance.
作者
杨培杰
鹿鹏
方露露
王向阳
YANG Peijie;LU Peng;FANG Lulu;WANG Xiangyang(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,Jiangsu 210016,China;Jiangsu Province Key Laboratory of Aerospace Power System,Nanjing University of Aeronautics and Astronautics,Nanjing,Jiangsu 210016,China;Ministry of Industry and Information Key Laboratory of Thermal Environment and Structure in Aero Engine,Nanjing University of Aeronautics and Astronautics,Nanjing,Jiangsu 210016,China)
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2019年第6期643-648,661,共7页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(51506087)
中国博士后科学基金资助项目(2015M571747)
南京航空航天大学研究生创新基地开放基金资助项目(kfjj20170202)
关键词
轴承腔
两相流动
回油槽
滞留体积分数
回油比
数值模拟
bearing chamber
two-phase flow
scavenge sump
residence volume fraction
scavenge ratio
numerical simulation
