工质与结构对径向气箔轴承静态特性影响分析  

Analysis of the influence of fluid and structure on static characteristics of radial gas foil bearings

作　　者：赵梓宇 冯汉升 李世林[1,2] 陈怡丹 余强 周亚琦 付豹[1,2] 庄明 Zhao Ziyu;Feng Hansheng;Li Shilin;Chen Yidan;Yu Qiang;Zhou Yaqi;Fu Bao;Zhuang Ming(Institute of Plasma Physics,HFIPS,Chinese Academy of Science,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院合肥物质科学研究院等离子体物理研究所,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《低温与超导》2023年第8期24-30,68,共8页Cryogenics and Superconductivity

基　　金：国家重大科技基础设施建设项目(2018-000052-73-01-001228)资助。

摘　　要：本文以氦气、氮气与空气为工质润滑的径向气箔轴承为研究对象,耦合气膜厚度方程求解定常Reynolds方程,得到了不同工质润滑的动压径向轴承无量纲气膜压力分布图与中截面无量纲气膜厚度分布图,并得到了同一内径下,转速、长径比与偏心率对承载力与摩擦力矩的影响规律。结果表明:不同介质在相同工况下的径向气箔轴承具有相似的无量纲气膜压力分布,在中截面处,氦气润滑的轴承具有最高的气膜压力,氮气润滑的轴承具有最低的气膜压力。不同润滑介质的气体轴承无量纲气膜厚度分布基本相同,随着周向角度的增加,气膜厚度先减小后增加,氦气润滑的轴承在正压区域的气膜厚度最大,润滑介质为氮气时在正压区域的气膜厚度最小。气体轴承的承载力和摩擦力矩均随着转速的提高而增加。在内径与偏心率相同情况下,长径比越大气体轴承的承载力越大,在内径与长径比相同情况下,偏心率越大气体轴承的承载力和摩擦力矩也更大。The radial gas foil bearings lubricated by helium,nitrogen and air was studed.The steady Reynolds equation was solved using a coupled finite difference and numerical iteration method to obtain the dimensionless pressure and film thickness distribution maps.The effects of speed,length-to-diameter ratio and eccentricity on the bearing load and friction torque were also investigated for the same inner diameter.The results show that the dimensionless pressure distribution of the bearings lubricated by different media under the same working conditions is similar,where the helium-lubricated bearing has the highest film pressure and the nitrogen-lubricated bearing has the lowest.The dimensionless film thickness distribution of the gas bearings lubricated by different media is basically the same,with film thickness to decrease and then increase with the increase of the circumferential angle.The helium-lubricated bearing has the largest film thickness in the positive pressure region,while the nitrogen-lubricated bearing has the smallest.The load and friction torque of the gas bearings increase with an increase in speed.For the same inner diameter and eccentricity,the load of the gas bearing increases with an increase in length-to-diameter ratio,while the load and friction torque increase with an increase in eccentricity at the same inner diameter and length-to-diameter ratio.

关 键 词：氦气 氮气 空气 径向箔片气体轴承 静态特性 

分 类 号：TH133.37[机械工程—机械制造及自动化]