影响三瓣式高速浮环密封性能的敏感参数

李庆展; 李双喜; 郑娆; 马文杰; 庄宿国

doi:10.13700/j.bh.1001-5965.2019.0248

影响三瓣式高速浮环密封性能的敏感参数

doi: 10.13700/j.bh.1001-5965.2019.0248

1.
北京化工大学流体密封技术研究中心, 北京 100029
2.
西安航天动力研究所, 西安 710100

基金项目:

国家重点研发计划 2018YFB2000800

详细信息

作者简介:
李庆展男, 硕士研究生。主要研究方向:流体润滑与密封技术

李双喜男, 博士, 副教授。主要研究方向:流体润滑与密封技术

通讯作者:
李双喜. E-mail:buctlsx@126.com

中图分类号: V219;TB42
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出版历程
- 收稿日期: 2019-05-22
- 录用日期: 2019-10-11
- 网络出版日期: 2020-03-20

Sensitive parameters affecting performance of three-petal high-speed floating-ring seal

1.
Research Center of Fluid Sealing Technology, Beijing University of Chemical Technology, Beijing 100029, China
2.
Xi'an Aerospace Propulsion Institute, Xi'an 710100, China

Funds:

National Key R & D Program of China 2018YFB2000800

More Information

Corresponding author: LI Shuangxi, E-mail:buctlsx@126.com

摘要

摘要:
针对应用在液体火箭发动机上的三瓣式高速浮环密封（TFRS），揭示密封在复杂多变工况下的泄漏特性和磨损特性，得到影响密封特性的敏感参数，促进高速密封技术的发展。针对压力、转速和密封周向弹簧比压等关键敏感参数，数值模拟了密封的泄漏率变化规律，试验测量了密封环的泄漏率和磨损率。研究结果表明：泄漏率和磨损率都随压力增大而增大；转速对三瓣式高速浮环密封磨损率敏感，对密封泄漏率不敏感，随着转速的增加，磨损率增大较快，泄漏率减小较慢；随着密封周向弹簧比压的增大，前期密封周向弹簧比压对泄漏率敏感，此时泄漏率变化幅度较大，磨损率变化幅度较小，后期密封周向弹簧比压对磨损率敏感，此时磨损率变化幅度较大，泄漏率变化幅度较小，密封周向弹簧比压在适当范围内时，泄漏率和磨损率都较小。研究结果为液体火箭发动机三瓣式高速浮环密封的设计、实际应用和深入研究提供了基础。
- 发动机 /
- 浮环密封 /
- 泄漏 /
- 磨损 /
- 数值模拟 /
- 试验分析
Abstract:
In view of the three-petal high-speed floating-ring seal (TFRS) applied in liquid rocket engine, the leakage and wear characteristics of the seal under complex and changeable conditions are revealed, and the sensitive parameters affecting the sealing characteristics are obtained, which promotes the development of high-speed seal technology. According to the key parameters of pressure, rotational speed and circumferential spring specific pressure of the seal, the leakage rate of TFRS was simulated numerically, and the leakage rate and wear rate of TFRS were measured experimentally. The analysis results show that the leakage rate and wear rate increase with the increase of pressure. Speed is sensitive to TFRS wear rate and insensitive to TFRS leakage rate. With the increase of speed, wear rate increases rapidly and leakage rate decreases slowly. With the increase of spring specific pressure of the seal, the earlier spring specific pressure of the seal are the sensitive parameters affecting the leakage rate. At this time, the leakage rate changes greatly and the wear rate changes slightly. The later spring specific pressure of the seal are the sensitive parameters affecting the wear rate. At this time, the wear rate changes greatly and the leakage rate changes slightly. The leakage rate and wear rate are smaller in the appropriate range of spring specific pressure of the seal. The research results provide a basis for the design, application and in-depth study of TFRS for liquid rocket engines.
- engine /
- floating-ring seal /
- leakage /
- wear /
- numerical simulation /
- experiment analysis

HTML全文

图 1 TFRS结构

Figure 1. TFRS structure

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图 2 TFRS石墨环实物图

Figure 2. Photo of TFRS graphite ring

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图 3 TFRS受力分析

Figure 3. Force analysis of TFRS

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图 4 理论分析模型

Figure 4. Theoretical analysis model

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图 5 流体域网格划分

Figure 5. Mesh generation in fluid domain

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图 6 不同压力下的黏-温曲线

Figure 6. Viscosity-temperature curves under different pressures

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图 7 计算流程图

Figure 7. Computational flowchart

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图 8 流体域压力分布云图

Figure 8. Pressure distribution contour in fluid domain

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图 9 环形沟槽流体域轴向压力分布云图

Figure 9. Contour of axial pressure distribution in ring groove fluid domain

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图 10 环形沟槽流体域轴向速度分布云图

Figure 10. Contour of axial velocity distribution in ring groove fluid domain

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图 11 TFRS试验装置结构

Figure 11. Experiment device structure of TFRS

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图 12 TFRS密封试验台

Figure 12. Seal experiment device of TFRS

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图 13 压力对密封泄漏率的影响

Figure 13. Effect of pressure on leakage rate of seals

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图 14 压力对密封磨损率的影响

Figure 14. Effect of pressure on wear rate of seals

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图 15 转速对密封泄漏率的影响

Figure 15. Effect of speed on leakage rate of seals

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图 16 转速对密封磨损率的影响

Figure 16. Effect of speed on wear rate of seals

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图 17 密封周向弹簧比压对密封泄漏率的影响

Figure 17. Effect of spring specfic pressure of seal on leakage rate of seals

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图 18 密封周向弹簧比压对密封磨损率的影响

Figure 18. Effect of spring specfic pressure of seal on wear rate of seals

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图 19 密封磨损情况

Figure 19. Wear of seals

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表 1 结构参数

Table 1. Structure parameters

结构参数	数值
周向弹簧槽径/mm	35
瓣环内径/mm	23
瓣环外径/mm	37
瓣环宽度/mm	6
单瓣角度/(°)	118
分瓣数量	3
注：内槽类型为正弦曲线环形沟槽；连接方式为榫形搭接。

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表 2 操作参数

Table 2. Operation parameters

操作参数	数值
进口压力p_i/MPa	0~0.4
出口压力p_o/MPa	0
介质温度/K	295
密度/(kg·m^-3)	1.197
黏度/(Pa·s)	1.82×10^-5
转速n/(r·min^-1)	0~27 000
注：介质为空气。

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