• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2018, Vol. 54 ›› Issue (20): 152-158.doi: 10.3901/JME.2018.20.152

• 润滑、泄漏与密封 • 上一篇    下一篇

边界滑移对柱塞偶件间油膜流动规律的影响

刘赵淼1, 尉舰巍1, 郑会龙1,2, 张谭2, 康振亚2   

  1. 1. 北京工业大学机电学院 北京 100124;
    2. 中国航空工业集团北京航空精密机械研究所精密制造技术航空科技重点研究室 北京 100076
  • 收稿日期:2017-03-27 修回日期:2017-09-20 出版日期:2018-10-20 发布日期:2018-10-20
  • 通讯作者: 刘赵淼(通信作者),女,1970年出生,博士,教授,博士研究生导师。主要研究方向为微流体力学、流固耦合问题及其工程应用。E-mail:lzm@bjut.edu.cn
  • 作者简介:尉舰巍,男,1991年出生。主要研究方向为结构间油膜流动。E-mail:Net_imail@126.com
  • 基金资助:
    航空科学基金资助项目(20140375002,20150375001)。

Influence of Slip Boundary Condition on Oil Film Flow Between Piston and Cylinder

LIU Zhaomiao1, YU Jianwei1, ZHENG Huilong1,2, ZHANG Tan2, KANG Zhenya2   

  1. 1. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124;
    2. AVIC Beijing Precision Engineering Institute for Aircraft Industry Aviation Key Laboratory of Science and Technology on Precision Manufacturing Technology, Beijing 100076
  • Received:2017-03-27 Revised:2017-09-20 Online:2018-10-20 Published:2018-10-20

摘要: 斜盘式轴向柱塞泵内柱塞偶件间油膜为相对运动的偶件提供润滑及密封作用。油膜流动将直接影响柱塞偶件的工作性能。深入分析偶件间油膜的流动规律对设计与优化柱塞偶件有重要意义。基于Navier-Stokes(N-S)方程,引入Navier边界滑移推导偶件间油膜流动方程,根据柱塞运动的周期性规律,分析单个周期内滑移长度和柱塞泵转速对油膜流动剪应力及流量的影响。研究发现:吸油阶段时近柱塞壁面处油膜剪应力随滑移长度增大而减小,流量随着滑移长度增大而增大,柱塞运动速度最大且滑移长度由1 μm增大到3 μm后,剪应力减小18%,流量增大13.59%;排油阶段柱塞运动速度越大,近柱塞壁面处剪应力和油膜流量与无滑移条件下的差距越小。在滑移长度为1 μm的条件下柱塞泵转速由1 500 r/min增大到4 000 r/min时,近柱塞壁面处的油膜剪应力与无滑移条件下相比降低明显,一个周期内油膜总流量与无滑移条件下相比差距减小。

关键词: Navier边界滑移, 油膜剪应力, 油膜流动, 柱塞偶件

Abstract: In the swash plate-type axial piston pump, the relative motion of piston/cylinder is lubricated and the fluid in the displacement chamber is sealed by the oil film between piston and cylinder. The characteristics of piston/cylinder is influenced by the oil film directly and significant to design and optimize the piston/cylinder. According to the periodic rule of piston motion, the shear stress and flow rate of oil film under different slip lengths and rotational speeds of pump in a period of work are analyzed by the kinetic equation, which is built on the Navier-Stokes(N-S) equations and the Navier-slip boundary condition. During the suction phase, it is shown that the shear stress near the piston wall reduces but the flow rate increases with the increasing slip length. The shear stress decreases about 18% and flow rate increases about 13.59% when slip length increases from 1 μm to 3 μm at the maximum velocity of piston. During the pumping phase, the larger velocity of piston results in the smaller difference of the shear stress near the piston wall and the flow rate between the slip condition and no-slip condition. Comparing with the no-slip condition, the shear stress reduces obviously and the gap of total flow rate also decreases when the slip length is 1 μm and the rotational speed of pump increases from 1 500 r/min to 4 000 r/min.

Key words: navier-slip boundary, oil film flow, piston and cylinder, shear stress

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