A Numeircal Analysis Of Mechanical Seal Face’s Pressuer Field&Temperature Field And Its Expeirmental Study

As a universal application of the sealing technology, the mechanical seal is used in manyoccasions to seal a vairety of fluid, especially in petroleum and petrochemical field where areused most widely, it is the indispensable part of all kinds of pumps and other rotatingequipments for sealing fluid.Mechanical seal under the running state, there is an extremely thin (microns) liquid iflmbetween the end face, the lfow state of the extremely thin liquid iflm effects flow fielddistirbution of mechanical seal face. In the case of changes of operating parameters, the lfowstate of the film will change and then cause leakage changes and the temperature of end faceirses; such problems have a great inlfuence on performance of mechanical seal. In this paper,we take fluid iflm which is between rotating irng and static ring gap of commonly usedmechanical seal as the research object，and pressure ifeld and temperature field of fluid iflm inthe gap are studied. Firstly, a three-dimensional film model is established by pre-treatmcntmodeling sotfware GAMBIT of FLUENT software of CFD and meshes are generated. Atfersetting suitable boundary condition, the model is imported into FLUENT with numericalcalculation for flow field of fluid film under different operating conditions, and points out theproblems that need to be pay attention in the calculation; Pressure, velocity, temperaturedistirbution and the focre and leakage of interface lfuid iflm are got atfer numerical calculation,and the law of changes of the operating parameters are studied, such as difference pressurebetween inside and outside of the rotating and static ring end face and rotational speed on thesealing performance. Secondly, this paper meas’ures films multi points temperature, pressurewith mechanical seal expeirmental bench, gets the temperature and pressure distirbution, andlast compares them with the results of the numeircal simulation, the credibility of thenumerical simulation was veirifed and the reason why there is difference betweenexpeirmental data and numerical data was found.Through numeircal simulation and the expeirmental measurement, it is shown that theinfluence of working parameters such as differential pressure and rotational speed on pressure field and temperature ifeld distirbution of liquid iflm between mechanical seal face gap isobvious. The changes of the parameters will change the operation condition state，thicknessand structure of the liquid iflm, heat tarnsfer condition between the liquid iflm and the sealingirng, thus influence the performance of the whole mechanical seal. Numerical simulation andexperimental research study for the condition of the flow ifeld of the liquid film betweenmechanical seal friction pair has an important function on reducing leakage, the temperatuerirse, friction and attrition, improving sealing performance of mechanical seals, which providedtheory and practice basis for performance optimization design of mechanical seals.