In order to get the accurate liquid film thickness of the upstream pumping mechanical seal, the model of 3-D flow in upstream pumping mechanical seals with spiral grooves was made by Pro/E wildfire. To construct parametric micro-gap geometrical model of seal faces, using dynamic mesh technology, Fluent software was applied to simulate the flow field of spiral groove upstream pumping mechanical seal in consider of the cavitations. Liquid membrane thicknesses of different working conditions were obtained and compared with the experiments to verify the correctness of the simulation results. And the effect of working condition parameters on liquid membrane stiffness and the leakage were calculated and analyzed. Research shows that: Liquid membrane thicknesses obtained by simulation is basically in line with that of the experiments (the maximum relative error is 19.6%, the minimum relative error is 0, the average relative error is 8%), which verifies the dynamic mesh technique to the flow field simulation on the mechanical seal is feasible. the problem of cavitations should be considered in flow field calculation on the mechanical seal to obtain the true flow field characteristics the simulation based on dynamic mesh and cavitations model in the flow field can be used to predict liquid membrane thickness. Leakage and liquid film rigidity increase with the speed, medium pressure increases, and spiral groove end can produce pumping effect, meanwhile, the dynamic pressure effect are obtained.
CHEN Hui-Long- Liu-Yu-Hui- Liu-Tong- Wang-Qiang- Li-Wen-Yu. The upstream pumping mechanical seal performance study based on the dynamic mesh and cavitations model [J]. Journal of Drainage and Irrigation Machinery Engin, 0, (): 1-.
Ding Xuexing，Wang Yan，Xu Zhigang et al．Numerical simulation of liquid membrane among mcro-pore end mechanical seals with computational fluid dynamics(CFD) [J]．Lanzhou University of Technology，2011，37(2)：39-44