摘要
U形密封环是液体火箭发动机常用的一种密封结构,其密封性能是决定发动机可靠性的关键因素。为研究U形环的密封机制,改善其整体结构的密封性能,构建U形环密封结构的有限元分析模型,分析常温预紧工况和低温工作工况下密封环的密封性能。结果表明:相对于常温(20℃)预紧工况,低温(-183℃)工作工况下U形环密封面的有效接触宽度和接触应力更大,但仍存在密封面接触不充分的问题。采用密封界面形貌的优化设计方法对U形环密封界面进行优化设计,优化后U形环密封面从平坦形貌变为非平坦的非线性形貌,低温工作工况下U形环密封面的有效接触宽度增加了138%,接触应力分布均匀程度提升了99%,密封面的有效接触宽度大幅增加,接触应力分布的均匀性大幅改善,整体结构的密封性能显著提升。
U-shaped seal ring is a kind of seal structure commonly used in liquid rocket engine,and its sealing perform-ance is the key factor to determine the reliability of the engine.In order to study the U-shaped ring sealing mechanism and improve the sealing performance of the overall structure,the finite element analysis model of U-ring seal structure was con-structed,and the sealing performance of the sealing ring was analyzed under normal temperature pretightening and low tem-perature working conditions.It is found that compared to the pretightening condition at room temperature(20℃),the ef-fective contact width and contact stress of the U-shaped ring sealing surface are larger under low temperature(-183℃)working conditions,but there is still an issue of insufficient contact between the sealing surfaces.The interface of U-ring seal was optimized by the optimization design method of seal interface morphology.After optimization,the U-shaped ring sealing surface changes from a flat morphology to an uneven and non-linear morphology.Under low-temperature working conditions,the effective contact width of the U-shaped ring sealing surface is increased by 138%,the uniformity of contact stress distribution is improved by 99%,the effective contact width of the sealing surface is increased significantly,and the uniformity of contact stress distribution is improved significantly.The overall sealing performance of the structure is signifi-cantly improved.
作者
黄伟旋
岳婷
林起崟
党琰
周意葱
闫嘉霖
洪军
HUANG Weixuan;YUE Ting;LIN Qiyin;DANG Yan;ZHOU Yicong;YAN Jialin;HONG Jun(Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System,Xi’an Jiaotong University,Xi’an Shaanxi 710049,China;Xi’an Aerospace Engine Co.,Ltd.,Xi’an Shaanxi 710100,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2024年第5期15-22,共8页
Lubrication Engineering
基金
国家自然科学基金项目(52222508,51975457)。
关键词
U形密封环
密封性能
优化设计
接触宽度
接触应力
U-shaped seal ring
sealing performance
optimization design
contact width
contact pressure
