级数对刷式密封泄漏流动与传热特性影响数值与实验研究

林溪岳; 孙丹; 郭海龙; 李玉; 杨艺潇; 张静涵

doi:10.13224/j.cnki.jasp.20240091

级数对刷式密封泄漏流动与传热特性影响数值与实验研究

doi: 10.13224/j.cnki.jasp.20240091

林溪岳^{1, 2,},
孙丹^{1, 2,*, ,},
郭海龙³,
李玉^{1, 2},
杨艺潇^{1, 2},
张静涵^{1, 2}

1.
沈阳航空航天大学航空发动机学院辽宁省航空推进系统先进测试技术重点实验室，沈阳 110136
2.
沈阳航空航天大学沈阳市透平机械先进密封技术重点实验室，沈阳 110136
3.
中国航发湖南动力机械研究所，湖南株洲 410315

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:
林溪岳（2000-），男，硕士生，主要从事多级刷式密封性能分析与结构设计。E-mail：1209817494@qq.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

中图分类号: V233.5
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出版历程
- 收稿日期: 2024-02-22
- 网络出版日期: 2024-11-05

Numerical and experimental study on the effect of the stage number on the characteristics of leakage flow and heat transfer in brush seal

LIN Xiyue^{1, 2
,},
SUN Dan^{1, 2,*
, ,},
GUO Hailong³,
LI Yu^{1, 2},
YANG Yixiao^{1, 2},
ZHANG Jinghan^{1, 2}

1.
Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System，School of Aero-engine，Shenyang Aerospace University，Shenyang 110136，China
2.
Key Laboratory of Turbomachinery Advanced Seal Technology，Shenyang Aerospace University，Shenyang 110136，China
3.
Hunan Aviation Powerplant Research Institute，Aero Engine Corporation of China，Zhuzhou Hunan 410315，China

摘要

摘要:
级数对多级刷式密封泄漏流动与传热特性影响较大，推导级数对多级刷式密封泄漏流动与传热特性影响的理论公式，建立多级刷式密封求解模型并基于流固热耦合计算方法进行数值模拟，设计多级刷式密封泄漏量和压力分布测量实验，搭建多级刷式密封泄漏和压力分布特性实验装置，将实验结果与数值结果相互对比以验证数值模拟的准确性，分析对比不同级数刷式密封之间流场与温度场分布特性，研究级数对刷式密封泄漏特性，流动特性以及传热特性的影响规律。研究结果表明：在相同压比下，从一级到三级刷式密封，每增加一级，各级刷丝束所承担的压降值降低，刷丝束压降最大值降低30.0%～36.3%；流场最大速度出现在末级刷丝束后挡板下方，随级数增加，流场最大速度降低；相同压比下，随级数增加，刷式密封封严性能增强，每增加一级，泄漏量减小15.7%～22.0%；相同压比下，随级数增加，最高温度增大，每增加一级，最高温度增大3.7%～9.1%。
- 多级刷式密封 /
- 级数 /
- 泄漏流动特性 /
- 传热特性 /
- 流固热耦合
Abstract:
For multi-stage brush seal, stage number has a great influence on the characteristics of leakage flow and heat transfer. The theoretical formula, which explains how the stage number affects the characteristics of leakage flow and heat transfer in multi-stage brush seal, was derived. The solution model of multi-stage brush seal was established and the numerical simulation was carried out based on the fluid-solid-thermal coupling calculation method. The leakage and pressure distribution measurement experiment of multi-stage brush seal was designed. The experimental device of leakage and pressure distribution characteristics of multi-stage brush seal was built. The experimental results were compared with the numerical results to verify the accuracy of the numerical simulation. The distribution characteristics of flow field and temperature field between different series brush seals were analyzed and compared. The influences of series on the leakage characteristics, flow characteristics and heat transfer characteristics of brush seal were studied. The results showed that under the same pressure ratio, from one to three stages brush seals, for each additional level, the pressure drop value borne by each stage of brush tows decreased, and the maximum pressure drop of brush tows decreased by 30.0%—36.3%. The maximum velocity of the flow field appeared below the rear baffle of the last stage brush tow, and the maximum velocity of the flow field decreased with the increase of stage number. Under the same pressure ratio, with the increase of stage number, the sealing performance of the brush seal was enhanced. For each additional stage, the leakage was reduced by 15.7%—22.0%. Under the same pressure ratio, the maximum temperature increased with the increase of stage number, and the maximum temperature increased by 3.7%—9.1% for each additional stage.
- multi-stage brush seal /
- stage number /
- leakage flow characteristics /
- heat transfer characteristics /
- fluid-solid-heat coupling

HTML

图 1 多级刷式密封结构示意图（以三级为例）

Figure 1. Multi-stage brush seal structure diagram（take the three stages as an example）

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图 2 刷式密封泄漏流动示意图

Figure 2. Brush seal leakage flow diagram

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图 3 刷式密封内部流动路径示意图

Figure 3. Internal flow path diagram of brush seal

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图 4 多级刷式密封传热路径示意图

1 刷丝与转子间的导热；2 刷丝径向导热；3 气流与刷丝间对流换热。

Figure 4. Heat transfer path diagram of multi-brush seal

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图 5 刷式密封求解模型

Figure 5. Brush seal solution model

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图 6 网格划分结果图

Figure 6. Grid division result diagram

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图 7 网格无关性验证

Figure 7. Grid independence verification

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图 8 边界条件示意图

Figure 8. Boundary condition diagram

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图 9 刷式密封流固热耦合方法流程图

Figure 9. Flow chart of brush seal fluid-solid-thermal coupling method

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图 10 刷式密封泄漏流动特性实验台

Figure 10. Brush seal leakage flow characteristic test bench

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图 11 刷式密封泄漏流动特性实验原理图

Figure 11. Schematic diagram of brush seal leakage flow characteristics experimental device

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图 12 实验气缸示意图

Figure 12. Experimental cylinder schematic diagram

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图 13 计算结果与实验结果对比图

Figure 13. Comparison of calculated results and experimental results

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图 14 多级刷式密封压力分布云图

Figure 14. Pressure distribution cloud diagram of brush seal at all levels

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图 15 多级刷式密封压力分布随压比变化曲线

Figure 15. Brush seal pressure distribution at all levels with the pressure ratio curves

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图 16 多级刷式密封速度分布云图

Figure 16. Velocity distribution cloud diagram of brush seal at all levels

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图 17 多级刷式密封速度分布随压比变化曲线

Figure 17. Brush seal velocity distribution at all levels with the pressure ratio curves

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图 18 多级刷式密封泄漏量随压比变化曲线

Figure 18. Brush seal leakage at all levels with the pressure ratio curves

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图 19 多级刷式密封温度分布云图

Figure 19. Temperature distribution cloud diagram of brush seal at all levels

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图 20 多级刷式密封最高温度随压比变化曲线

Figure 20. Maximum temperature of brush seals at all levels varies with the pressure ratio curves

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表 1 刷式密封结构参数

Table 1. Brush seal structure parameters mm

结构参数	数值
前挡板保护高度	2.00
前挡板宽度	2.00
后挡板保护高度	1.00
后挡板宽度	2.00
刷丝直径	0.07
刷丝间距	0.007
刷丝束径向长度	10.40
级间距	10.00
前后挡板间距	2.00

下载: 导出CSV

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