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高速高压宽温域动压密封动环端面微变形及其改善方法

李世聪 钱才富 李双喜 钟建锋 刘兴华

李世聪, 钱才富, 李双喜, 等 . 高速高压宽温域动压密封动环端面微变形及其改善方法[J]. 北京航空航天大学学报, 2021, 47(6): 1173-1185. doi: 10.13700/j.bh.1001-5965.2020.0167
引用本文: 李世聪, 钱才富, 李双喜, 等 . 高速高压宽温域动压密封动环端面微变形及其改善方法[J]. 北京航空航天大学学报, 2021, 47(6): 1173-1185. doi: 10.13700/j.bh.1001-5965.2020.0167
LI Shicong, QIAN Caifu, LI Shuangxi, et al. Face micro-deformation and its control method of rotating ring of hydrodynamic face seal under high speed, high pressure and wide temperature range[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(6): 1173-1185. doi: 10.13700/j.bh.1001-5965.2020.0167(in Chinese)
Citation: LI Shicong, QIAN Caifu, LI Shuangxi, et al. Face micro-deformation and its control method of rotating ring of hydrodynamic face seal under high speed, high pressure and wide temperature range[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(6): 1173-1185. doi: 10.13700/j.bh.1001-5965.2020.0167(in Chinese)

高速高压宽温域动压密封动环端面微变形及其改善方法

doi: 10.13700/j.bh.1001-5965.2020.0167
基金项目: 

国家重点研发计划 2018YFB2000800

中央高校基本科研业务费专项资金 BHYC1703A

详细信息
    通讯作者:

    李双喜, E-mail: buctlsx@126.com

  • 中图分类号: V232

Face micro-deformation and its control method of rotating ring of hydrodynamic face seal under high speed, high pressure and wide temperature range

Funds: 

National Key R · D Program of China 2018YFB2000800

the Fundamental Research Funds for the Central Universities BHYC1703A

More Information
  • 摘要:

    针对高速高压高温/低温工况下动压密封变形问题,以动压密封的典型结构为研究对象,考虑动环的支撑和约束,建立热固耦合分析模型,研究热载荷、力载荷和约束对动环端面微变形的影响,并提出动环端面微变形改善方法。结果表明:多载荷共同作用时,温差对动环端面微变形影响最大,其次是转速和压力;在2种情况下,动环端面微变形受温度值的影响很小,主要与温差有关;相比低温,动环端面微变形更易受高温的影响,单位温差的变形变化量为3~4倍;动环形心距旋转中心越远,动环端面微变形受转速影响越大,且呈抛物线关系;动环端面微变形与压差呈线性关系。对高速高压宽温域的动压密封,控制动环端面微变形,首先,应降低动环的温差;其次,若转速够高,应适当增加动环厚度,通过扩大形心变化区域能增加86%的动环端面微变形范围,若转速不够高,通过合理的结构设计约束动环内表面以控制动环翻转,最大能降低65.2%的动环端面微变形;最后,合理设计的轴向压紧力能进一步确保动环端面微变形维持在极小范围内。

     

  • 图 1  动压密封的基本结构及动环结构

    Figure 1.  Basic structure of hydrodynamic face seal and structure of rotating ring

    图 2  柱坐标系与边界条件示意图

    Figure 2.  Schematic diagram of cylindrical coordinates and boundary conditions

    图 3  动环端面变形量的对比

    Figure 3.  Comparison of face deformation amount of rotating ring

    图 4  不同温差的动环轴向位移和端面微变形

    Figure 4.  Axial displacement and face micro-deformation of rotating ring under different temperature differences

    图 5  不同温度值的动环端面微变形

    Figure 5.  Face micro-deformation of rotating ring under different temperatures

    图 6  不同转速的动环轴向位移和端面微变形

    Figure 6.  Axial displacement and face micro-deformation of rotating ring under different rotational speeds

    图 7  不同压差的动环轴向位移和端面微变形

    Figure 7.  Axial displacement and face micro-deformation of rotating ring under different pressure differences

    图 8  多载荷共同作用下动环端面微变形

    Figure 8.  Face micro-deformation of rotating ring under multiple loads

    图 9  轴向压紧力对动环端面微变形的影响

    Figure 9.  Face micro-deformation of rotating ring under different clamping loads

    图 10  形心位置与动环端面微变形的关系

    Figure 10.  Relationship between centroid position and face micro-deformation of rotating ring

    表  1  动环结构参数及动环结构形式

    Table  1.   Structural parameters of rotating ring and structure form of rotating ring

    参数 数值
    轴径d1/mm 50
    定位环外径d2/mm 58
    动环外径d3/mm 76
    压紧环外径d4/mm 55
    结构Ⅰ动环尾部外径d5/mm 57
    结构Ⅰ动环厚度δ1/mm 10
    结构Ⅱ、Ⅲ动环厚度δ2/mm 6
    定位环厚度δ3/mm 4
    结构Ⅰ背部倾斜角α1/(°) 15
    结构Ⅱ背部倾斜角α2/(°) 25
    下载: 导出CSV

    表  2  载荷、约束与温度边界条件

    Table  2.   Load, constraint and temperature boundary conditions

    边界 载荷与约束 温度
    AB 零压力 T2
    BC 零压力 T2
    CD pcla + padd T2
    DE 零压力 T2
    EF 0.82p1 + ps
    FG p1 T1
    GA 约束轴向(z向)位移 绝热
    下载: 导出CSV

    表  3  操作参数

    Table  3.   Operating parameters

    参数 数值
    外壁面温度T1/℃ -200~300
    内壁面温度T2/℃ -200~300
    介质压力p1/MPa 0~20
    轴向压紧力pcla/MPa 25~100
    转速ω/(r·min-1) 0~100 000
    下载: 导出CSV

    表  4  材料属性

    Table  4.   Material properties

    物理性能 GH4169 S30408
    弹性模量E/GPa 205 193
    泊松比μ 0.3 0.3
    导热系数
    k/(W·(m·℃)-1)
    13.4 17.2
    恒压热容
    Cp/(J·(kg·℃)-1)
    435 500
    线膨胀系数
    αl/(10-6·℃-1)
    11.8 (20~100 ℃)
    13.0 (20~200 ℃)
    13.5 (20~300 ℃)
    16.0 (20~100 ℃)
    16.8 (20~200 ℃)
    17.5 (20~300 ℃)
    密度ρ/(kg·m-3) 8 240 7 930
    下载: 导出CSV

    表  5  验证性参数

    Table  5.   Confirmatory parameters

    参数 数值
    内面板半径Ri/mm 109
    外面板半径Re/mm 153
    外半径R0/mm 156
    水力半径Rh/mm 122
    转速ω/(r·min-1) 1 500
    出口压力pi/MPa 0.55
    入口压力po/MPa 15.5
    密封圈的弹性模量E1/GPa 310
    钢的弹性模量E2/GPa 200
    密封圈导热系数k1/(W·(m·℃)-1) 22
    钢的导热系数k2/(W·(m·℃)-1) 30
    密封圈的线膨胀系数β1/(10-6-1) 2.5
    钢的线膨胀系数β2/(10-6-1) 12
    螺钉预紧力Fpre/N 8×5 000
    下载: 导出CSV
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  • 收稿日期:  2020-04-29
  • 录用日期:  2020-07-25
  • 刊出日期:  2021-06-20

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