Optimum analysis of vaporization and phase change performance of spiral groove hydrodynamic seal liquid film

MA Run-mei, FENG Rui-peng, LI Shuang-xi, WANG Jia-xing, LIU Zhi-wei, SONG Ren-long
(Research Center for Fluid Sealing Technology, Beijing University of Chemical Technology, Beijing 100029, China)

Abstract: Aiming at the problem of the reliability and stability of the seal operation are seriously affected,after the vapor-phase change of the spiral groove dynamic pressure sealing liquid film, a numerical calculation model considering the vaporization phase change of the liquid film on the sealing end face was established.A five-factor and five-level orthogonal optimization test plan was designed with the performance parameters of leakage amount and opening force as the optimization objectives, and the five sealing end face parameters as the variables, including helix angle, number of grooves, groove depth, groove-dam ratio and groove-dam ratio. The influence of different structural parameters of seal face on sealing performance was studied under the condition of liquid film vaporization. The results indicate that the sensitivity of the sealing structure parameters to the leakage and opening force is different. The designed orthogonal test scheme can effectively optimize the sealing performance.It provides a reference for the structural optimization design and practical operation of the sealing device under such working conditions.
Key words: dynamic pressure seal; vaporization phase change; lubrication mode; sealing performance; orthogonal optimization