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刷式密封刷丝浮升效应流固耦合数值研究

孙基生 孙丹 赵欢 慕伟 张杰一 温帅方

孙基生, 孙丹, 赵欢, 等. 刷式密封刷丝浮升效应流固耦合数值研究[J]. 航空动力学报, 2024, 39(9):20220182 doi: 10.13224/j.cnki.jasp.20220182
引用本文: 孙基生, 孙丹, 赵欢, 等. 刷式密封刷丝浮升效应流固耦合数值研究[J]. 航空动力学报, 2024, 39(9):20220182 doi: 10.13224/j.cnki.jasp.20220182
SUN Jisheng, SUN Dan, ZHAO Huan, et al. Numerical investigation on bristles buoyancy effect of brush seals with fluid-structure interaction[J]. Journal of Aerospace Power, 2024, 39(9):20220182 doi: 10.13224/j.cnki.jasp.20220182
Citation: SUN Jisheng, SUN Dan, ZHAO Huan, et al. Numerical investigation on bristles buoyancy effect of brush seals with fluid-structure interaction[J]. Journal of Aerospace Power, 2024, 39(9):20220182 doi: 10.13224/j.cnki.jasp.20220182

刷式密封刷丝浮升效应流固耦合数值研究

doi: 10.13224/j.cnki.jasp.20220182
基金项目: 国家自然科学基金(52075346); 先进航空动力创新工作站(依托中国航空发动机研究院设立)项目(HKC2020-02-030); 辽宁省教育厅基础研究项目(JYT2020047)
详细信息
    作者简介:

    孙基生(1999-),男,硕士生,主要从事刷式密封刷丝动力学特性研究

    通讯作者:

    孙丹(1981-),男,教授,博士,主要从事航空发动机先进密封技术研究。E-mail:phd_sundan@163. com

  • 中图分类号: V233.5

Numerical investigation on bristles buoyancy effect of brush seals with fluid-structure interaction

  • 摘要:

    基于简化悬臂梁模型分析了刷式密封刷丝浮升效应理论,采用ALE(arbitrary Lagrange-Euler)流固耦合方法建立了刷式密封刷丝浮升效应三维瞬态数值求解模型,在验证了数值模型准确性基础上,研究了刷丝总体变形特性,量化分析了刷丝自由端轴向、径向和总体变形量,研究了结构参数与工况参数对刷式密封刷丝浮升效应的影响规律,揭示了刷式密封刷丝浮升效应诱发机理。研究结果表明:刷式密封刷丝浮升效应是前排刷丝受非定常径向气流作用产生的刷丝扰动现象,刷丝浮升效应会使前排刷丝向来流方向发生较大变形,并使前排刷丝与转子面产生径向间隙,泄漏量增加。当进出口压比从2提高至4,刷丝自由端平均变形量增加了47%,将前挡板保护高度从1.5 mm提高至2.5 mm,刷丝自由端平均变形量增加了36%,均使刷丝浮升效应增强。刷式密封前挡板与刷丝束间隙提供的径向气流通道,进出口压差在前挡板与刷丝束间隙内产生的径向压力梯度是刷丝浮升效应的诱发条件,提高刷丝直径和降低前挡板与刷丝束间隙均可降低刷丝浮升效应。

     

  • 图 1  刷式密封刷丝浮升效应示意图

    Figure 1.  Schematic diagram of the bristles buoyancy effect of brush seals

    图 2  刷式密封二维结构图

    Figure 2.  Two-dimensional structural diagram of brush seals

    图 3  数值计算模型

    Figure 3.  Numerical calculation model

    图 4  网格划分示意图

    Figure 4.  Grid diagram

    图 5  边界条件

    Figure 5.  Boundary condition

    图 6  泄漏量对比验证

    Figure 6.  Comparison and verification of leakage

    图 7  刷式密封总体变形图

    Figure 7.  Total deformation diagram of brush seals

    图 8  刷丝自由端总体变形径向视图

    Figure 8.  Radial view of total deformation of the bristle tips

    图 9  不同时刻下刷丝自由端总变形量

    Figure 9.  Total deformation of the bristle tips at different time

    图 10  不同时刻下刷丝自由端轴向变形量

    Figure 10.  Axial deformation of the bristle tips at different time

    图 11  不同时刻下刷丝自由端径向变形量

    Figure 11.  Radial deformation of the bristle tips at different time

    图 12  不同压比下刷丝自由端总变形量

    Figure 12.  Total deformation of the bristle tips under different pressure ratio

    图 13  不同压比下刷丝自由端平均变形量

    Figure 13.  Average deformation of the bristle tips under different pressure ratio

    图 14  不同刷丝直径下刷丝自由端总变形量

    Figure 14.  Total deformation of the bristle tips under different diameter of the bristles

    图 15  不同刷丝直径下刷丝自由端平均变形量

    Figure 15.  Average deformation of the bristle tips under different diameter of the bristles

    图 16  不同前挡板保护高度下刷丝自由端总变形量

    Figure 16.  Total deformation of the bristle tips under different protection height of the front plate

    图 17  不同前挡板保护高度下刷丝自由端平均变形量

    Figure 17.  Average deformation of the bristle tips under different protection height of the front plate

    图 18  不同前挡板与刷丝束间隙下刷丝自由端总变形量

    Figure 18.  Total deformation of the bristle tips under different clearance between the front plate and the bristle pack

    图 19  不同前挡板与刷丝束间隙下刷丝自由端平均变形量

    Figure 19.  Average deformation of the bristle tips under different clearance between the front plate and the bristle pack

    图 20  刷式密封刷丝浮升效应诱发机理流程图

    Figure 20.  Flow chart of the inducing mechanism of bristles buoyancy effect of brush seal

    表  1  刷式密封结构参数

    Table  1.   Strctural parameters of brush seals

    结构参数数值
    前挡板宽度wf/mm1.0
    后挡板宽度wb/mm2.0
    刷丝束轴向厚度ws/mm1.5
    前挡板保护高度hf/mm1.5、2.0、2.5
    后挡板保护高度hb/mm1.0
    刷丝束与转子面间隙hg/mm0
    刷丝束与前挡板间隙wg/mm0.6、0.7、0.8
    刷丝直径D/mm0.06、0.07、0.08
    刷丝间距d/mm0.006、0.007、0.008
    刷丝径向长度L/mm10.4
    下载: 导出CSV

    表  2  网格无关性验证

    Table  2.   Grid independence verification

    网格数量/104泄漏量相对误差(%)
    7514.25
    1268.63
    1882.14
    2260.88
    2640.6
    下载: 导出CSV

    表  3  模型工况参数

    Table  3.   Operating parameters of model

    工况参数数值
    进口压力/MPa0.2、0.3、0.4
    出口压力/MPa0.1
    刷丝与刷丝间摩擦因数0.3
    刷丝与挡板间摩擦因数0.3
    下载: 导出CSV
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  • 收稿日期:  2022-04-01
  • 网络出版日期:  2024-04-24

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