超高速微织构螺旋槽干气密封热-流-固耦合分析  

Heat-fluid-solid coupling analysis of ultra‑high speed micro‑textured spiral groove dry gas seal

作　　者：刘暅豪 丁雪兴[1] 丁俊华 LIU Genghao;DING Xuexing;DING Junhua(School of Petroleum and Chemical 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：《流体机械》2025年第3期69-78,共10页Fluid Machinery

基　　金：国家重点研发计划(2020YFB2010001);研究生“创新之星”项目(2023CXZX-431)。

摘　　要：为探究超高速干气密封端面轴向变形对密封性能的影响规律,在考虑力载荷、热载荷作用下,建立三维几何固体域模型以及流体域模型,引入Air真实气体效应、湍流效应等多重复杂效应情形下,研究超高转速干气密封间隙流体对动、静环耦合面轴向变形规律以及变形对密封性能影响。研究表明,当n为40 000 r/min,P_(i)为8~14 MPa,T_i为373.15~493.15 K时工况条件下,密封环端面出现不同程度的微变形;当n为40 000 r/min,P_(i)为11 MPa,T_i为373.15 K时工况条件下,力变形下的泄漏率最大(MS-DGS,4.19 g/s),热变形下的泄漏率最小(MS-DGS,1.69 g/s),在热-流-固耦合变形下,泄漏率是介于力变形和热变形范围之间(MS-DGS,3.66 g/s);MS-DGS端面轴向变形较S-DGS端面轴向变形较小,且MS-DGS较S-DGS泄漏率降低1.94%。研究可为超高速干气密封的优化设计提供参考。This study investigates the influence of axial deformation on the sealing performance of ultra‑high speed dry gas seals under combined mechanical and thermal loads.A 3D geometric solid domain model and fluid domain model were established,incorporating complex effects such as real gas behavior and turbulence.The axial deformation patterns of the rotating and stationary rings,as well as their impact on sealing performance,were analyzed under extreme operating conditions(rotational speed n=40000 r/min,inlet pressure P_(i)=8~14 MPa,inlet temperature Ti=373.15~493.15 K).Results show that mechanical deformation under n=40000 r/min,P_(i)=11 MPa,and Ti=3373.15 K yields the maximum leakage rate(MS-DGS,4.19 g/s),while thermal deformation produces the minimum leakage(MS-DGS,1.69 g/s).The leakage rate under heat‑flow-solid coupled deformation falls between these extremes(MS-DGS,3.66 g/s).Compared to conventional S-DGS,the MS-DGS exhibits reduced axial deformation and a 1.94%lower leakage rate.These findings provide critical insights for optimizing ultra‑high speed dry gas seal design.

关 键 词：干气密封 微织构 超高速 真实气体效应 热-流-固耦合 变形 

分 类 号：TH136[机械工程—机械制造及自动化]