Abstract: Spiral groove dry gas seal is a new type,non-contact mechanical seal, which has many advantages such as small leakage, little surface abrasion, low power loss, long service life and high reliability.Utilizing the finite element method, the flow of the gas between the spiral groove dry gas seal faces was investigated by numerical simulation.The pressure distribution of the gas film was obtained.The main seal performance parameters, such as open force, friction force of the face, frictional power loss, axial stiffness and leakage rate were calculated.The influence of the operation conditions and the spiral groove’s geometric parameters on seal performance was also analyzed.The research results provided valuable reference for design of the spiral groove dry gas seal.

摘要： 螺旋槽干气密封是一种新型的非接触式机械密封，它具有介质泄漏量少、端面磨损小、能耗低、运行寿命长和可靠性高等优点.采用有限元法对螺旋槽干气密封端面间气体的流动过程进行了数值模拟研究，得到了端面间气膜的压力分布规律并对主要的密封性能参数——开启力、端面摩擦力、摩擦功耗、轴向刚度以及泄漏量进行了计算，最后，探讨了操作参数和端面槽形几何参数对密封性能的影响.研究结果为螺旋槽干气密封的设计提供了有益的参考.