涡轮泵用不同槽型流体动压型机械密封运行特性对比研究
Comparative Study on the Operating Characteristics of Fluid Dynamic Pressure Mechanical Seals with Different Groove Type for Turbopumps
任宝杰 1姜绪强 2李铭 2郝木明 3涂霆 2刘馥瑜3
作者信息
- 1. 东营海森密封技术有限责任公司,山东东营 257067;中国石油大学(华东)密封技术研究所,山东青岛 266580
- 2. 北京航天动力研究所,北京 100076
- 3. 中国石油大学(华东)密封技术研究所,山东青岛 266580
- 折叠
摘要
针对火箭发动机低温介质涡轮泵端面密封的泄漏突增问题,基于工程经验提出激光脸(槽深3、5 µm)和螺旋槽3种槽型结构,并与原使用的雷列槽进行端面流场与密封性能对比分析,同时对4种槽型结构进行密封动态追随性比较分析.结果发现:低温介质下雷列槽端面密封流体动压较弱,影响端面开启的主要因素为流体介质静压力;在转速和压力增大的条件下雷列槽存在负动态刚度系数,角向的稳定性较差,存在泄漏风险;激光脸泄漏量较低且处于混合润滑状态,不会因密封端面脱开而引起密封动态不稳定;槽深5 µm与槽深3 µm激光脸相比有更大的开启力与较低的相变率,综合性能更优;螺旋槽结构动压效应较强,其开启力随转速和压力的线性变化都保障了密封环的追随性;螺旋槽结构具有较强变工况适应性,但泄漏量水平始终较高.
Abstract
Aimed at the problem of sudden increase in leakage in end face seals used in rocket turbopump with low tem-perature medium,based on engineering experience,three types of groove structures,such as laser face(groove depth of 3μm and 5 pm)and spiral groove,were proposed,and their fluid field and sealing performance of the end face were ana-lyzed and compared with the original Rayleigh groove.And a comparative analysis of the sealing dynamic tracking perform-ance for four types of groove structures was conducted.It is found that the hydrodynamic pressure of the fluid of the end face seal with Rayleigh groove is weak under low temperature medium,and hydrostatic effect is the major factor to the seal-ing rings lift-off.Negative dynamic stiffness coefficient and angular instability occur in the Rayleigh grooves with the in-crease of rotational speed and pressure,and there is a risk of leakage.Laser face has lower leakage due to the mixed lubri-cation,which enhance the stability.Laser face with a groove depth of 5 μm has a larger opening force and lower phase tran-sition rate compared to a groove depth of 3 μm,and it has better overall performance.Spiral groove has a greater hydrody-namic effect,and the linear variation of its opening force and with pressure and rotational speed ensures the tracking of sealing ring.The spiral groove structure has a better adaptability to variable working conditions,but the leakage is high.
关键词
涡轮泵/低温介质/机械密封/密封性能/稳定性Key words
turbopump/low-temperature medium/mechanical seal/sealing performance/stability引用本文复制引用
基金项目
国家重点研发计划项目(2020YFB2010000)
国家自然科学基金项目(51975585)
出版年
2024
NETL
NSTL
万方数据