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两级均压刷式密封泄漏流动特性数值研究

张静涵 孙丹 赵欢 徐文峰 慕伟 张杰一

张静涵, 孙丹, 赵欢, 等. 两级均压刷式密封泄漏流动特性数值研究[J]. 航空动力学报, 2024, 39(X):20230114 doi: 10.13224/j.cnki.jasp.20230114
引用本文: 张静涵, 孙丹, 赵欢, 等. 两级均压刷式密封泄漏流动特性数值研究[J]. 航空动力学报, 2024, 39(X):20230114 doi: 10.13224/j.cnki.jasp.20230114
ZHANG Jinghan, SUN Dan, ZHAO Huan, et al. Numerical study on leakage flow characteristics of novel two-stage pressure equalizing brush seal[J]. Journal of Aerospace Power, 2024, 39(X):20230114 doi: 10.13224/j.cnki.jasp.20230114
Citation: ZHANG Jinghan, SUN Dan, ZHAO Huan, et al. Numerical study on leakage flow characteristics of novel two-stage pressure equalizing brush seal[J]. Journal of Aerospace Power, 2024, 39(X):20230114 doi: 10.13224/j.cnki.jasp.20230114

两级均压刷式密封泄漏流动特性数值研究

doi: 10.13224/j.cnki.jasp.20230114
基金项目: 国家自然科学基金(52075346);中国航空发动机集团产学研合作项目(HFZL2021CXY012)
详细信息
    作者简介:

    张静涵(2000−),女,硕士生,主要从事多级刷式密封性能分析与结构设计。E-mail:18840620028@163. com

    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

Numerical study on leakage flow characteristics of novel two-stage pressure equalizing brush seal

  • 摘要:

    多级刷式密封存在各级级间压降分配不均衡导致提前失效的问题,提出下游级后挡板开孔的两级均压刷式密封结构,建立三维实体两级均压刷式密封数值计算模型,在验证数值模型准确性基础上,数值分析两级均压刷式密封的泄漏流动特性,研究均压孔结构参数对改进型结构泄漏特性和级间压降均衡性的影响规律。研究结果表明:设有均压孔的两级均压刷式密封较传统结构提高了压降均衡性,且降低了刷式密封摩擦热效应;传统两级刷式密封的压降均衡性系数明显大于两级均压刷式密封,改进型结构的压降均衡性系数较传统结构改善了45.6%~67.9%;均压孔直径从0.2 mm增大至0.8 mm、均压孔高度从3.55 mm增大至8.35 mm与均压孔排数设置为3排时压降均衡性系数分别减小38.5%、7.7%和25.1%;改进型结构泄漏量相比于传统结构略有增大,且泄漏量随均压孔直径的增大而增加,随均压孔高度的提高无明显变化,随均压孔排数的增加而增大。

     

  • 图 1  传统两级刷式密封结构示意图

    Figure 1.  Schematic diagram of traditional two-stage brush seal structure

    图 2  两级均压刷式密封二维结构示意图

    Figure 2.  Two-dimensional structure diagram of the two-stage pressure equalizing brush seal

    图 3  两级均压刷式密封数值求解模型

    Figure 3.  Numerical solution model of two-stage pressure equalizing brush seal

    图 4  网格划分示意图

    Figure 4.  Diagram of grid division

    图 5  网格无关性验证

    Figure 5.  Grid independence verification

    图 6  边界条件

    Figure 6.  Boundary conditions

    图 7  刷式密封泄漏特性实验装置

    Figure 7.  Brush seal leakage characteristic test equipment

    图 8  泄漏量对比验证结果

    Figure 8.  Leakage volume comparison verification results

    图 9  传统结构与改进型结构气流速度分布

    Figure 9.  Airflow velocity distribution of traditional structure and improved structure

    图 10  传统结构与改进型结构轴向压力分布

    Figure 10.  Axial pressure distribution of traditional structure and improved structure

    图 11  传统结构与改进型结构级间压力对比

    Figure 11.  Comparison of pressure between the traditional structure and the improved structure

    图 12  传统结构与改进型结构泄漏量对比

    Figure 12.  Comparison of leakage quantity between traditional structure and improved structure

    图 13  传统结构与改进型结构流场温度分布

    Figure 13.  Temperature distribution of flow field between traditional structure and improved structure

    图 14  均压孔直径对两级刷式密封泄漏特性影响

    Figure 14.  Influence of pressure equalizing holes diameter on leakage characteristics of two-stage brush seal

    图 15  均压孔高度对两级刷式密封泄漏特性影响

    Figure 15.  Influence of pressure equalizing holes height on leakage characteristics of two-stage brush seal

    图 16  均压孔排数对两级刷式密封泄漏特性影响

    Figure 16.  Influence of pressure equalizing holes rows number on leakage characteristics of two-stage brush seal

    图 17  均压孔直径对两级刷式密封级间压降分配影响

    Figure 17.  Effect of pressure equalizing holes diameter on pressure drop distribution between two brush seal stages

    图 18  均压孔直径对压降均衡性系数影响

    Figure 18.  Influence of pressure equalization holes diameter on pressure drop equalization coefficient

    图 19  均压孔高度对两级刷式密封级间压降分配影响

    Figure 19.  Effect of pressure equalizing holes height on pressure drop distribution between two brush seal stages

    图 20  均压孔高度对压降均衡性系数影响

    Figure 20.  Influence of pressure equalization holes height on pressure drop equalization coefficient

    图 21  均压孔排数对两级刷式密封级间压降分配影响

    Figure 21.  Effect of pressure equalizing holes rows on pressure drop distribution between two brush seal stages

    图 22  均压孔排数对压降均衡性系数影响

    Figure 22.  Influence of pressure equalization holes rows on pressure drop equalization coefficient

    表  1  两级均压刷式密封结构参数

    Table  1.   Structural parameters of two-stage pressure equalizing brush seal

    结构参数数值
    前挡板保护高度Hf/mm8.4
    后挡板保护高度Hb/mm1.5
    刷丝直径D/mm0.08
    刷丝排列间距d/mm0.008
    刷丝束轴向厚度W/mm1.5
    刷丝束径向长度l/mm10.4
    前挡板宽度Lf/mm1.5
    后挡板宽度Lb/mm2
    级间距Wd/mm10
    均压孔直径Dj/mm0.2~0.8
    均压孔高度Hj/mm3.55~8.35
    下载: 导出CSV
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  • 收稿日期:  2023-02-28
  • 网络出版日期:  2024-06-07

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