• CN:11-2187/TH
  • ISSN:0577-6686

›› 2011, Vol. 47 ›› Issue (3): 73-80.

• 论文 • 上一篇    下一篇

薄膜节流器动静混合径向气体轴承性能

张广辉;刘占生   

  1. 哈尔滨工业大学能源科学与工程学院
  • 发布日期:2011-02-05

Performance Analysis of Membrane Restrictor Hybrid Journal Gas Bearings

ZHANG Guanghui;LIU Zhansheng   

  1. School of Energy Science and Engineering, Harbin Institute of Technology
  • Published:2011-02-05

摘要: 对薄膜节流器动静混合径向气体轴承进行理论研究与数值仿真,建立薄膜节流器内气体流动模型并进行简化,采用流体阻抗法将薄膜节流器的流量表达式并与气体轴承小孔节流流量表达式联立,使用牛顿迭代 法对非线性气体雷诺方程进行处理,采用有限差分法对上述方程进行离散化进而求解含有薄膜节流器小孔节流气体轴承的雷诺方程,得到薄膜节流器的气体流量分配规律,进而获得有转速和零转速下轴承承载力。数值仿真结果表明,节流器气腔高度和节流器出口直径是薄膜节流器设计的关键参数,气腔高度越小,节流器出口直径越小,承载能力越大;使用薄膜节流器后,各节流孔的入气压力均有所降低,但是各孔之间的入气压力差增大,进而显著提高气体轴承承载能力。

关键词: 薄膜节流器气体轴承, 承载能力, 牛顿迭代, 气体润滑雷诺方程, 有限差分法

Abstract: The performance of membrane restrictor hybrid journal gas bearings is studied theoretically and simulated numerically. The model of gas flow in membrane restrictor is established and simplified. By employing fluid impedance method, the relation between the flow expression of membrane restrictor and the flow expression of gas bearing orifice restrictor is found. The Newton iteration method is employed to deal with the nonlinear gas Reynolds equation, the finite difference method is used to discretize the equations, the Reynolds equation of the membrane restrictor hybrid gas bearing is solved, the gas flow distribution law of membrane restrictor is obtained and then the bearing load capacity under different rotating speeds and no rotating speeds are acquired. The numerical simulation results indicate that the chamber height and the outlet diameter of the membrane restrictor are the key parameters for the design of the membrane restrictor, the smaller the chamber height and outlet diameter of restrictor are, the greater the load capacity will be; by utilizing the membrane restrictor, the intake gas pressures of orifices decrease, but the intake gas pressure difference among different orifices increases, so the bearing load capacity increases obviously.

Key words: Finite difference method, Load capacity, Membrane restrictor gas bearings, Newton iteration, Reynolds equation for gas lubrication

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