Abstract:When the cylinder spiral groove dry gas seal is applied to high parameter working condition,the floating ring is prone to deform,which affects the operation and performance of the seal system.According to the structural characteristics of cylinder dry gas seal,the model of rotating ring and floating ring was established by considering fluidsolid coupling.The cylinder gas film calculating domain was drawn,the gas model was meshed by using ICEM software with unique block mapping technology.The gas film flow field was simulated by Fluent,and the change function of the film bearing capacity on the floating ring surface was extracted.By coupling the varying film pressure to the solid surface of the floating ring with ANSYS Workbench,the force deformation was solved,the influence of medium pressure and the rotational speed on deformation was discussed.The results show that the extrusion deformation along the radial direction is the main deformation of floating ring,the maximum compression displacement occurs at the outer edge of the floating ring,and the maximum deformation exceeds the average gas film thickness of the seal,which indicates the variation of the flow field has a certain effect on the floating ring deformation.The maximum deformation and stress of the floating ring are increased linearly with the pressure of the medium and the rotational speed,in which medium pressure plays a leading role.