透平膨胀机径向动静压混合气体轴承静特性分析  

Static Characteristics Analysis of Radial Hybrid Gas Bearing for Turbo Expander

作　　者：张晓华 柯长磊 彭楠[1] 刘立强[1,2] ZHANG Xiao-hua;KE Chang-lei;PENG Nan;LIU Li-qiang(Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国科学院理化技术研究所,北京100190 [2]中国科学院大学,北京100190

出　　处：《机械设计与制造》2023年第7期296-300,304,共6页Machinery Design & Manufacture

基　　金：中国科学院重点部署项目资助(ZDRW-CN-2020-3)。

摘　　要：透平膨胀机应用的小孔节流式静压气体轴承的本质是动静压混合气体轴承,这里将动静压混合气体轴承作为研究对象,从动压轴承和静压轴承角度分别研究其工作原理和静态特性。混合气体轴承中气膜压力分布是求解轴承静态特性的关键,采用有限差分法(FDM)对含有气膜压力的Reynolds方程通过MTLAB编写的程序进行求解,分析混合轴承的工作原理并计算其静态特性。对比分析偏心率、转速、长径比和供气压力等因素对动压轴承和静压轴承静态特性的影响。结果表明:增大偏心率、提高转速、增大供气压力,采用轴承大长径比均可以提高动静压混合气体轴承的承载力;增大偏心率和提高转速,可增大气膜刚度,降低转子姿态角,提高转子稳定性。The essence of the orifice type aerostatic bearing used in turbo expander is the hybrid gas bearing.As the research object,its working principle and static characteristics are studied respectively from the angle of dynamic pressure bearing and static pressure bearing in this paper.The distribution of gas film pressure is the key to solve the static characteristics of the bearing.The Reynolds equation is solved by the finite difference method(FDM)by the MATLAB program.The influence of the eccentricity ratio,the rotating speed,the length diameter ratio and the air supply pressure on the static characteristics is analyzed.The results showed that the loading capacity of hybrid gas bearing can be improved by increasing the eccentricity ratio,the rotating speed and the air supply pressure;the film stiffness and the rotor stability can be improved by increasing the eccentricity ratio and the rotatingspeed.

关 键 词：混合气体轴承 有限差分法 雷诺方程 静态特性 

分 类 号：TH16[机械工程—机械制造及自动化] TP242[自动化与计算机技术—检测技术与自动化装置]