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叠层式箔片动压气体推力轴承承载特性

张镜洋 孟光荣 陈蓓曦 吕元伟 张靖周 罗欣洋

张镜洋, 孟光荣, 陈蓓曦, 等. 叠层式箔片动压气体推力轴承承载特性[J]. 航空动力学报, 2023, 38(6):1423-1431 doi: 10.13224/j.cnki.jasp.20210711
引用本文: 张镜洋, 孟光荣, 陈蓓曦, 等. 叠层式箔片动压气体推力轴承承载特性[J]. 航空动力学报, 2023, 38(6):1423-1431 doi: 10.13224/j.cnki.jasp.20210711
ZHANG Jingyang, MENG Guangrong, CHEN Beixi, et al. Loading capacity of multi-layer foil gas thrust bearing[J]. Journal of Aerospace Power, 2023, 38(6):1423-1431 doi: 10.13224/j.cnki.jasp.20210711
Citation: ZHANG Jingyang, MENG Guangrong, CHEN Beixi, et al. Loading capacity of multi-layer foil gas thrust bearing[J]. Journal of Aerospace Power, 2023, 38(6):1423-1431 doi: 10.13224/j.cnki.jasp.20210711

叠层式箔片动压气体推力轴承承载特性

doi: 10.13224/j.cnki.jasp.20210711
基金项目: 航空基金(201928052008)
详细信息
    作者简介:

    张镜洋(1981-),男,副教授、硕士生导师,博士,主要研究方向为流体机械和传热与传质。 E-mail:zjy@nuaa.edu.cn

  • 中图分类号: V229+.2;TH33.35

Loading capacity of multi-layer foil gas thrust bearing

  • 摘要:

    为揭示叠层式箔片结构对动压气体推力轴承承载性能的强化机制,建立了该结构静力学有限元仿真模型及弹流润滑分析方法,研究了叠层式箔片结构刚度随载荷的变化及楔形气膜间隙特征参数的演化规律。结果表明:随着载荷升高,叠层式结构刚度增幅呈先小后大的非线性特征,且周向局部刚度大小交替变化。这导致轴承楔形气膜间隙特征参数随承载力增大而明显变化,承载力从15 N增大到75 N,楔形高度可从45 μm降低至16.8 μm,节距比则先增大后减小。与承载力相同条件下的波箔型轴承相比,叠层式箔片动压气体推力轴承气膜压力分布会出现承载力强化的双峰值,且最小气膜厚度可增大35%至50%,可有效降低转静子间的碰磨概率。

     

  • 图 1  叠层式箔片动压气体推力轴承模型示意图

    Figure 1.  Structural diagram of multi-layer foil gas thrust bearing

    图 2  弹流润滑受力与变形迭代示意图

    Figure 2.  Schematic view of elastohydrodynamic lubrication for stress and deformation

    图 3  计算网格

    Figure 3.  Computational grid

    图 4  网格独立性验证: 箔片变形随网格数量的变化

    Figure 4.  Grid independence: variation of foil deformation with the quantity of grids

    图 5  计算流程图

    Figure 5.  Flow chat of calculation

    图 6  数值模拟结果与文献结果对比:最小气膜厚度随承载力的变化规律

    Figure 6.  Comparison of numerical results with literatures: variation of minimum film thickness with capacity

    图 7  刚度随载荷增大的变化规律

    Figure 7.  Variation of stiffness with enhanced load

    图 8  周向节点刚度随承载力的变化规律

    Figure 8.  Variation of circumferential joint stiffness with capacity

    图 9  均布载荷下箔片变形示意图

    Figure 9.  Schematic diagram of foil deformation under uniform load

    图 10  顶箔中径截面高度在周向上的变化规律(ω=7.5×104 r/min)

    Figure 10.  Variation of top foil height on 1/2 radius plane in circumferential direction (ω=7.5×104 r/min)

    图 11  楔形高度与承载力的变化规律

    Figure 11.  Variation of wedge height with capacity

    图 12  节距比与承载力的变化规律

    Figure 12.  Variation of pitch with capacity

    图 13  各箔片变形云图(ω=7.5×104 r/min)

    Figure 13.  Contours of foils deformation (ω=7.5×104 r/min)

    图 14  无量纲气膜压力对比

    Figure 14.  Comparison of dimensionless film pressure

    图 15  无量纲气膜厚度对比

    Figure 15.  Comparison of dimensionless film thickness

    表  1  叠层式箔片动压气体推力轴承几何参数

    Table  1.   Geometric parameters of multi-layer foil gas thrust bearing

    参数数值
    轴承箔片公称内径R1/mm12
    轴承顶箔公称外径R2/mm21.5
    顶箔厚度ht/mm0.1
    背板厚度hb/mm0.12
    中箔厚度hm/mm0.3
    中箔凸台高度hs/mm0.2
    底箔厚度hg/mm0.2
    轴承扇形箔片个数 n8
    顶箔张角β/(°)45
    下载: 导出CSV
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  • 收稿日期:  2021-12-15
  • 网络出版日期:  2023-01-05

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