Analysis of flow characteristics on the end face of spiral groove mechanical seal based on turbulence model
To investigate the turbulent flow characteristics of high-speed liquid film lubricated spiral groove mechanical seal,the relative velocity,pressure and turbulent kinetic energy distribution of the liquid film were calculated based on k-ω turbulence model,and the opening force and leakage rate of the seal and loss proportion for each entropy production were analyzed.The results show that the fluid velocity is low at groove area and high at dam area.The liquid film pressure exhibits periodic distribution,and the cavitation areas occur at the front 1/2 flow direction position on back of the spiral groove.The fluid turbulent kinetic energy at the inlet of the spiral groove is relatively large.In the spiral groove depth direction,the closer it is to spiral groove bottom wall of the rotating ring,the larger the turbulent energy.The total entropy production losses in the lubricant film is significantly larger than that in the spiral groove,the proportion of total wall entropy production loss is larger than 60%,and the proportion of entropy production loss caused by turbulent flow is larger than 30%.As the rotating speed increases,the opening force and leakage rate increase,the wall entropy production loss increases,and the direct entropy production loss decreases.The turbulence and fluctuation entropy production losses are relatively stable when rotating speed is higher than 10 000 r/min,the total proportion ranges from 35.64%to 37.24%.As the film thickness increases,the opening force decreases,the leakage rate increases,the wall entropy production loss first increases,then decreases and then increases,and the direct entropy production loss decreases.The turbulence and fluctuation entropy production losses are relatively stable when film thickness is larger than 4 μm,the total proportion ranges from 40.26%to 42.15%.The research results can provide theoretical guidance for the structural design of high speed and low energy consumption mechanical seals.
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