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高压高剪切率下密封环缝隙流体动态润滑特性

张乐涛 刘志奇 李占龙 徐彦 高宇

张乐涛, 刘志奇, 李占龙, 等 . 高压高剪切率下密封环缝隙流体动态润滑特性[J]. 北京航空航天大学学报, 2021, 47(6): 1261-1270. doi: 10.13700/j.bh.1001-5965.2020.0144
引用本文: 张乐涛, 刘志奇, 李占龙, 等 . 高压高剪切率下密封环缝隙流体动态润滑特性[J]. 北京航空航天大学学报, 2021, 47(6): 1261-1270. doi: 10.13700/j.bh.1001-5965.2020.0144
ZHANG Letao, LIU Zhiqi, LI Zhanlong, et al. Hydrodynamic lubrication characteristics of piston ring gap under high pressure and high shear rate[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(6): 1261-1270. doi: 10.13700/j.bh.1001-5965.2020.0144(in Chinese)
Citation: ZHANG Letao, LIU Zhiqi, LI Zhanlong, et al. Hydrodynamic lubrication characteristics of piston ring gap under high pressure and high shear rate[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(6): 1261-1270. doi: 10.13700/j.bh.1001-5965.2020.0144(in Chinese)

高压高剪切率下密封环缝隙流体动态润滑特性

doi: 10.13700/j.bh.1001-5965.2020.0144
基金项目: 

国家自然科学基金 51975396

山西省自然科学基金 201701D121070

山西省科技重大专项国际合作项目 GJ2016-02-2

详细信息
    通讯作者:

    刘志奇, E-mail: liuzhiqi@tyust.edu.cn

  • 中图分类号: TH322;TH137.51

Hydrodynamic lubrication characteristics of piston ring gap under high pressure and high shear rate

Funds: 

National Natural Science Foundation of China 51975396

Natural Science Foundation of Shanxi 201701D121070

International Cooperation Project of Science and Technology Major Program of Shanxi Province GJ2016-02-2

More Information
  • 摘要:

    为减少高压高剪切率下热效应对密封环缝隙流体润滑性能的影响,以密封环缝隙流体剪切速度梯度、壁面剪切应力和油膜温升表征摩擦副润滑性能,采用RNG k-ε湍流模型,通过Workbench建立流-固-热多场模型,计算得到不同主轴转角下缝隙流动形态变化规律和温升前后油膜厚度变化量、不同L型槽内外径比及长径比下流速流型分布规律、壁面剪切应力、温度分布和热变形量。研究结果表明:密封环L型槽黏性底层随剪切速度增大而增厚,油膜厚度随运动周期增加而变薄;当L型槽内外径比小于1.07时,随比值减小密封环壁面剪切应力不断增大,最大变化率为7%;密封环L型槽长径比在0.19时平均壁面剪切应力达到最大,当长径比继续增大时,油膜区剪切速度梯度逐渐减小,油膜温升和热变形亦随之减小。研究结果可为马达优化以减少能量损失和改善密封环润滑条件提供理论指导和依据。

     

  • 图 1  密封环缝隙结构简图与受力分析

    Figure 1.  Structure diagram and stress analysis of piston ring gap

    图 2  密封环复合运动形式

    Figure 2.  Compound movement form of piston ring

    图 3  密封环缝隙流体动力润滑

    Figure 3.  Hydrodynamic lubrication of piston ring gap

    图 4  密封环计算区域和局部网格分布

    Figure 4.  Calculation area and local grid distribution of piston ring

    图 5  多物理场耦合实现原理

    Figure 5.  Principle of multiple physical fields coupling

    图 6  仿真结果与理论计算结果对比

    Figure 6.  Comparison between simulation results and theoretical calculation results

    图 7  网格无关性验证

    Figure 7.  Grid independence verification

    图 8  不同主轴转角下油液流动形态

    Figure 8.  Oil flow pattern under different angles of principal axis

    图 9  初始时刻油膜厚度分布三维图

    Figure 9.  Three-dimensional distribution of oil film thickness at initial moment

    图 10  运动5个周期后油膜厚度的变化

    Figure 10.  Change of oil film thickness after 5 movement cycles

    图 11  不同内外径比和不同长径比下缝隙流体流速流线和温度分布云图

    Figure 11.  Velocity streamline and temperature distribution contour of flow in gap under different internal and external diameter ratios and different length-to-diameter ratios

    图 12  不同内外径比下密封环壁面剪切应力变化

    Figure 12.  Change of piston ring's wall shear stress under different intenal and external diameter ratios

    图 13  不同长径比下密封环壁面剪切应力变化

    Figure 13.  Change of piston ring's wall shear stress under different length-to-diameter ratios

    图 14  密封环在多物理场下的变形

    Figure 14.  Deformation of piston ring in multiple physical fields

    表  1  密封环参数设定

    Table  1.   Parameter setting of piston ring

    参数 取值范围
    L型槽长L/密封环宽度D 0.13~0.27
    L型槽外径d2/密封环内径d1 1.03~1.08
    密封环密度ρm/(kg·m-3) 7 801
    弹性模量E/MPa 2.07×105
    泊松比ε 0.29
    下载: 导出CSV

    表  2  密封环工况条件

    Table  2.   Working condition of piston ring

    环境参数 数值
    初始缝隙高度δ0/μm 10
    工作压差Δ P/MPa 35
    剪切速度vx/(m·s-1) 6
    负载/(N·m) 889
    进油温度Ti/℃ 45
    Fe热膨胀系数/℃ 1.0×10-5
    初始润滑油黏度μ0/(mm2·s-1) 68
    下载: 导出CSV

    表  3  不同长径比下密封环的变形量与润滑特性

    Table  3.   Deformation and lubrication characteristics of piston ring under different length-to-diameter ratio

    L/D 三维模型 最大变形/μm 最大应力/MPa 最小油膜厚度/μm
    0.13 2.62 159 0.8
    0.16 2.69 164 0.75
    0.19 2.76 169 0.70
    0.22 2.71 165 0.73
    0.25 2.65 159 0.76
    0.27 2.59 154 0.79
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-04-16
  • 录用日期:  2020-06-05
  • 刊出日期:  2021-06-20

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