航空学报2025，Vol.46Issue(10)：360-371,12.DOI:10.7527/S1000-6893.2024.31297
基于引气封油的轴承腔石墨密封系统滑油泄漏流动特性试验
Experiment on leakage flow characteristics of lubricating oil for a carbon seal system of bearing chamber based on air-bleeding oil-sealing mode
摘要
Abstract
Leakage of lubricating oil from carbon seal system of bearing chamber caused by insufficient seal pressure from compressor and excessive oil supply pressure of bearing chamber has an important effect on the operational sta-bility of aero-engine.Based on air-bleeding oil-sealing mode,an experimental device was designed and built to simu-late structure and working environment of the carbon seal system in bearing chamber of an actual aero-engine.Evolu-tion process of oil leakage flow was visually observed.Effects of rotor speed and oil temperature on the critical oil-sealing pressure difference were experimentally studied.Leakage flow mechanism of oil through the carbon seal sys-tem in bearing chamber was revealed.Results show that as the sealing pressure difference gradually decreases,the lubricating oil initially from leaked the bottom of carbon seal ring,undergoing four processes:infiltration and backflow,increased infiltration,droplet-like leakage,and fluid-like leakage.The value of sealing pressure difference correspond-ing to that the droplet-like leakage occurred was considered as critical oil-sealing pressure difference of carbon seal system in bearing chamber.As rotor speed increased from 4 000 r/min to 12 500 r/min,the critical oil-sealing pressure difference decreased by 85.9%.At lower rotor speeds,the centrifugal force acting on the lubricating oil is relatively small,causing the oil to accumulate in clumps and fill the sealing gap.When the lubricating oil temperature increases from 40℃to 121℃,the critical oil-sealing pressure difference decreased by 83.1%.At lower oil temperature,the density and dynamic viscosity of the oil increased,gravity and viscous acting on the oil increased,accumulation of the oil in seal clearance also increased.关键词
轴承腔/石墨密封/引气封油/泄漏流动/临界封油压差Key words
bearing chamber/carbon seal/air-bleeding oil-sealing/leakage flow/critical oil-sealing pressure difference分类
航空航天引用本文复制引用
韩量宇,赵欢,常城,王平,孙丹,任国哲..基于引气封油的轴承腔石墨密封系统滑油泄漏流动特性试验[J].航空学报,2025,46(10):360-371,12.基金项目
国家自然科学基金(52375195,52475206) （52375195,52475206）
辽宁省属本科高校基本科研业务费专项资金(LJ222410143090) National Natural Science Foundation of China(52375195,52475206) （LJ222410143090）
Fundamental Research Funds for Universities of Liaoning Province(LJ222410143090) （LJ222410143090）
