The Variational Calculation And Optimization Of Microscale Gas Film Stiffness For Aerostatic Dry Gas Seal

Dry gas seal is the new type and the current rapid development of seal,it is widely used in high speed rotating equipment.With engineering applications continue to expand,dry gas seals began to be used on the low-speed devices,such as the reactor shaft seal.High-speed dynamic pressure theory can not apply to low-speed inflatable hydrostatic lubrication theory,it need to establish a static pressure of dry gas seal lubrication theory to guide the engineering application.The paper from a gas Reynolds equation,according to the characteristics of static pressure dry gas seals,using Galerkin finite element method to derive the variational equations of hydrostatic pressure dry gas seal gas film distribution by gas film boundary conditions are given the finite element method for solving the steady-state Reynolds equations process.Obtain the stationary seal end face of the pressure distribution of the stationary seal ring,In the axial direction,from the end of the static ring seal to the ring seal face direction,Showing a decreasing trend of parabolic pressure.In the stationary ring radial seal face,that gradually decreases from the orifice to the inner and outer diameters,pressure peak occurs at the orifice.Then through the heat balance analysis and model simplification,established under static pressure dry gas seals steady column coordinates without inner heat of solid thermal differential equations.Application of ANSYS software to establish the static pressure of dry gas seal dynamic and static ring deformation,temperature field and thermal coupling finite element analysis model,And sealing ring deformation analysis,temperature field and thermal coupling computing for deformation.Obtained only considers cases under deformation,the deformation and deformation of cloud of motionring and static ring.Analysis of temperature field and thermal seal face deformation of the coupling in case of deformation and deformation cloud of the static ring.According to the static pressure distribution at the steady state,the deformation of the static ring end face under the thermo-mechanical coupling is considered,which affects the rigidity of the film.The effects of different orifice parameters and end parameters on the stability of the seal under different conditions were calculated.The leakage and friction power of dry gas seal under different working conditions were obtained.And the optimized structure of micro-scale gas film displacement of dry gas seal face is obtained.