轴承腔环瓣式浮环密封摩擦热分析  

Frictional heat analysis of bearing cavity ring-shaped floating ring seal

作　　者：王佳星 李双喜[1] 马文杰 冯瑞鹏 刘志伟[1] WANG Jia-xing;LI Shuang-xi;MA Wen-jie;FENG Rui-peng;LIU Zhi-wei(Research Center for Fluid Sealing Technology,Beijing University of Chemical Technology,Beijing 100029,China;Beijing Aerospace Propulsion Institute,Beijing 100076,China)

机构地区：[1]北京化工大学流体密封技术研究中心,北京100029 [2]北京航天动力研究所,北京100076

出　　处：《机电工程》2020年第9期1032-1038,共7页Journal of Mechanical & Electrical Engineering

基　　金：国家重点研发计划项目(2018YFB2000800)。

摘　　要：针对航空发动机轴承腔高转速、变压差下的摩擦生热问题,对环瓣式浮环密封的主要参数进行了研究。采用ANSYS有限元软件,建立了密封摩擦发热以边界条件施加的热模型;基于Fluent建立了跑道散热流固热耦合模型,研究了不同阻封气温度、冷却油流量下跑道的温度变化,模拟了温度分布及冷却油散热效果,得出了影响密封发热的主要因素。研究结果表明:密封摩擦发热会引起局部温度过高,产生不均匀热应力导致密封面变形,增大泄漏量,压差、转速等对密封摩擦发热影响很大,应通过减小关闭压力的方式来减少密封的发热;冷却液的冷却效果与跑道的生热量存在极限值,继续增加供油量不会提高跑道的降温效果;该结果可为轴承腔环瓣式浮环密封的摩擦过程研究提供参考。Aiming at the problem of frictional heat generation under high speed and variable pressure difference in the bearing cavity of an aero-engine,the main parameters of the ring-lobe floating ring seal were studied.ANSYS finite element software was used to apply the frictional heat of seal under boundary conditions to establish a thermal model.Based on Fluent,a runway cooling fluid-solid-heat coupling model was established.The temperature change of the runway under different blocking gas temperature and cooling oil flow was studied.The temperature distribution and cooling oil cooling effect were simulated,and the main factors affecting the heating of the seal were obtained.The results indicate that the frictional heating of the seal will cause the local temperature to be too high,causing uneven thermal stress to cause deformation of the sealing surface and increase the amount of leakage.The pressure difference and speed will have a great impact on the frictional heating of the seal.The sealing pressure should be reduced by reducing the closing pressure.There is a limit to the cooling effect of the coolant and the heat generation of the runway.Continued increase in fuel supply will not increase the cooling effect of the runway.The research provides a reference for the friction process of the bearing cavity ring flap floating ring seal.

关 键 词：环瓣式浮环密封 摩擦发热 有限元分析 结构优化 

分 类 号：TH117.1[机械工程—机械设计及理论] TB42[一般工业技术]