衍生T形槽干气密封稳态性能研究  

Steady-state Performance Analysis of Derived T-groove Dry Gas Seal

作　　者：丁雪兴[1] 江安迪 王世鹏 丁俊华 蒋海涛 DING Xuexing;JIANG Andi;WANG Shipeng;DING Junhua;JIANG Haitao(College of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学石油化工学院,兰州730050

出　　处：《装备环境工程》2024年第3期105-112,共8页Equipment Environmental Engineering

基　　金：国家重点研发计划项目(2020YFB2010001);宁波市“科技创新2025”重大专项(2020Z112)。

摘　　要：目的 设计具备双向旋转特点的动压型干气密封端面结构,并展现良好的开启性能,以T形槽为优化对象,衍生出一种新型槽型结构。方法 借助有限元软件,计算并对比经典T形槽与衍生槽型在流场特性和稳态性能方面的差异,探讨不同参数对2种槽型干气密封稳态性能的影响规律,揭示衍生槽型的密封机理。结果 衍生槽型的开启力高于经典T形槽,泄漏率也会增加。随着工况参数的升高,2种槽型的稳态性能参数近似线性增加,且差异逐渐增大,最小差异达到6.6%。随着槽深的增加,泄漏率方面的差距在逐渐减小,为扩大衍生槽型的控漏效果,槽深应>5μm。开设有引流槽型结构的衍生槽型稳态性能顺序为发散型>直口型>收敛型,但在文中的工况下,数值差别较小,最大仅为1.2%。结论 相比于经典T形槽,衍生槽型具有更强的动压效应,开启性能明显提升。另外,通过开设不同形式的引流槽可以改变气膜的流动特性和干气密封性能。The work aims to design a dry gas seal end face structure with bi-directional rotation characteristics and favorable opening performance,and derive a new groove structure through optimization of the T-groove.The flow field characteristics and steady-state performance parameters of the classical T-groove and the derived groove were compared using finite element software.The influence of different parameters on the steady-state performance of the dry gas seals was also investigated to reveal the sealing mechanism of the derivative groove.Above all,the derived groove type had a higher opening force compared with the classical T-groove,resulting in increased leakage rate.The steady-state performance parameters of both groove types increased linearly with the working condition parameters,and the difference between the two types gradually widened,with a minimum difference of 6.6%.However,as the groove depth increased,the difference in leakage rate decreased.To improve the leakage control function of the derivative groove,the groove depth should be greater than 5 μm.The derived groove with a flow-inducing slot structure demonstrated better steady-state performance in the order of:divergent > straight > convergent.But the difference in values was small,which was up to 1.2%,under selected conditions.The derived groove exhibits a more pronounced dynamic pressure effect and significantly improved opening performance compared with the classical T-groove.Additionally,opening different forms of derivative groove can change the flow characteristics and sealing performance of the gas film.

关 键 词：T形槽干气密封 微槽流动 衍生结构 仿真计算 增压效应 

分 类 号：TB42[一般工业技术]