考虑甲烷溶解的机械密封瞬态特性研究OA

To address the issue of axial floating and angular deflection of the seal ring caused by changes in methane solubility and gas volume fraction in the oil phase within multiphase pumps,as well as slug flow impact,leading to seal ring wear failure,a transient dynamic model for oil-gas two-phase flow lubricated sealing considering methane dissolution is established.The model is solved using the finite difference method and the Euler method.The transient response characteristics of the seal before and after considering methane dissolution are compared,and the effects of axial pulsation and angular impact on the seal under different gas volume fractions when considering methane dissolution are investigated.The results show that when methane dissolution is considered,the fluctuations in film thickness and leakage rate are smaller,and the opening force tends to be consistent;during stage Ⅱ of axial vibration,when the gas volume fraction is 0.8,the displacement of the stationary ring is reduced by 3.25 times compared to when the gas volume fraction is 0;the stationary ring is less affected by angular impact,with the maximum change in central film thickness not exceeding 0.1 μm;when the gas volume fraction ranges from 0 to 0.8,the response of sealing performance to axial pulsation follows the same pattern;when the gas volume fraction is 0,the impact of angular shock on sealing performance is relatively small.This study provides theoretical guidance for the application of oil-gas two-phase sealing in multiphase pumps.