Study Of The Dynamic Characteristics Of Heat Fluid In The High-parameter Mechanical Seal

The mechanical seal is an important guarantee for the safe operation of powerequipment.The high-pressure, high temperature, high-speed, high corrosion extremeconditions could easily lead to the seal face temperature rise is too large, will cause the sealpair to form a heat cone or wave, abnormal wear of heat and hot corrosion, thermal crackingor cracking andface between the liquid film instability and failure phenomenon.The petrochemical industry, heat pump using the high parameter bellows mechanical sealas a research object, first create three-dimensional numerical model of the seal cavity flowfield, set the initial conditions of the boundary conditions.Base pressure solver and turbulencemodel was chosen based on computational fluid dynamics numerical calculations, thethree-dimensional equation of the medium in the capacity equation and continuity equation issolved, Flow field and seal pair and the contact surface at the pressure gradient cloud cloudpicture of the velocity gradient, temperature gradient cloud images, region of the vorticitydistribution in the flow field, particle motion traces cloud, turbulent kinetic energy andturbulent energy dissipation rate of thermal fluid powerthe characteristic distribution ofphysical fields at the same time, the vector of the above parameters, the contour map.Based on the characteristics of the thermal fluid dynamics of the cavity flow field to thecavity medium, ring, stationary ring and washing medium part of the overall numericalcalculation model, heat, flow, and solid multi-field coupling numerical calculation.First, thevarious parts of the numerical model, write the parameter conditions, material properties andboundary conditions for the numerical model, which is set in the fluid-solid interface heatconvection coefficient of the actual working conditions, a reasonable choice of the pressurerelaxationfactor and the difference between format, calculate the law of distribution of theflow characteristics of the pressure gradient and pressure of the liquid film coefficient, friction,and friction torque, temperature gradient and liquid film particle movement traces and otherparameters;Dynamic and static ring the heat load distribution characteristics of the axial andradial gradient-based finite element algorithm, by solving the physical equations, geometric equations and virtual work equation, the dynamic heat loads, static ring axialand radialthermal strain, thermal stress and thermal deformation.In addition, based on the finite elementdynamic analysis theory, numerical modal analysis of rotating ring preheat loads, and with noheat load factor results were compared, the seal pair at high parameters workersthe case of thevibration mechanism.Through comparative analysis of the numerical results under different conditions, thespindle speed, seal pressure, medium viscosity, medium temperature and liquid film thicknessfactor for heat flow field of the physical characteristics of the liquid film on the dynamic andstatic ringthermal deformation and thermal stress, as well as the influence of the vibrationcharacteristics of rotating ring, the extreme conditions of high parameters used in theoptimization design of the mechanical seal provides a basis.