Abstract:In order to study the effect of alternating load and thermal deformation on transient coupling characteristics of seal face,taking sideentry single mechanical seal of stirred kettle used for flue gas desulfurization as the research object,considering the change of fluid viscosity with temperature,a thermalmechanical coupling mathematical model was established and detailed solution boundary conditions were given.The spring force was expressed in the form of alternative load function,combined with the model of timehistory transient analysis,the Galerkin difference scheme was used to discrete the Reynolds equation and heat conduction equation in time domain,some performance parameters,such as contact pressure,friction torque and temperature distribution,were achieved.The results indicate that the characteristics of seal end faces investigated in the transient analysis are similar to those in the steady analysis in most of computational time,there exists local contact on the seal end faces and it is in the high temperature region.The force loaded on the sealing device is changed by timevarying spring ratio pressure,which makes the contact pressure,friction torque and temperature distribution be all alternate and transient,and there is a apparent thermallag phenomenon for the thermal characteristics such as the face temperature.