中文摘要：

鉴于干式气体密封启动过程的重要工程意义,基于稳态分析方法研究了该种密封的开启特性。根据开启临界气膜厚度的假设,提出了用于分析干式气体密封开启性能的判据——开启临界转速。研究了启动过程中,气膜厚度、开启力、气膜刚度、泄漏量、摩擦扭矩和摩擦功耗等密封性能参数的变化规律。分析了操作参数和端面结构参数对开启性能的影响。研究表明,启动过程中,密封的特性参数在开启临界气膜厚度附近快速变化;密封操作压力对开启临界转速有较大影响,通过改变端面结构参数可以改变密封的开启临界转速,改变开启性能。提供了一种用于分析密封开启性能的研究方法,可辅助密封端面结构设计和指导启动和停车过程操作。

英文摘要：

The behavior of the start up process of dry gas seal（DGS）,which has great significance in engineering was studied based on the steady state analysis.With the hypothesis of critical gas film thickness,a criterion for expressing the opening behavior of DGS,namely the critical opening rotational speed（CORS）,was proposed.Changes of the sealing parameters in the opening process,such as gas film thickness,opening force,film stiffness,leakage rate,frictional torque and frictional power consumption were investigated.Influences of operating and structural parameters on the opening behavior of DGS were analyzed.The results indicated that the sealing parameters changed remarkably near the opening critical film thickness in the start up process.CORS was greatly affected by sealing operating pressure,but it could be changed through structural parameter adjustment.By providing a method for analyzing the opening behavior of DGS,this work is helpful for the structural design of seal end faces and the guidance of the opening or closing operation.