Abstract:Dry gas seal dynamic provides a guarantee for the stable operation of dry gas seal.The research progress of dry gas seal dynamic in recent ten years was reviewed from two aspects,stable operation and unstable operation.The main factors affecting the dynamic behavior of dry gas seal have been summarized,including the dynamic characteristics of gas film and auxiliary seal ring,the type of flexibly mounted,the rubimpact characteristic of seal faces and the experimental test methods.When the perturbations of axial and angular were coupled or they were regarded as independent,the influence of sealing geometric parameters and operation parameters on gas film dynamic coefficients,the dynamic tracking response,the vibration stability and the nonlinear dynamic characteristics of seal system were introduced.The research progress of sealing unstable dynamic performance both in startup and shutdown phase were analyzed.It was pointed out that real gas effect,thermomechanical coupled effect and choked flow effect have an important influence on the dynamic behaviors of dry gas seal,which would be the research direction of sealing research in the future.