低液气比混合润滑下的动压密封性能分析

发布时间：2018-04-20 10:59

本文选题：液气比 + 混合润滑　；参考：《润滑与密封》2016年04期

【摘要】：针对小液滴均匀分布在气相中的两相润滑状态下的密封工况,建立气液混合物理模型,推导气液两相混合流体的等效黏度,建立气液混合润滑动压密封端面间的气液混合润滑Reynolds方程。利用MATLAB软件编写有限元程序求解气液混合润滑Reynolds方程,得到动压密封端面间气液混合流体的压力分布及密封性能参数,并分析在操作工况一定时,液气比对密封性能的影响。分析结果表明:在相同的膜厚下,液滴增强了端面流体动压效应;动压密封在运转过程中,端面密封间隙、摩擦功耗和质量泄漏率随液气比的增加而增加,体积泄漏率随液气比的增加而减少,而刚度随液气比的增加先增加后降低,存在最大值。
[Abstract]:The physical model of gas-liquid mixing is established for the condition of sealing under the condition of homogeneous distribution of small droplets in gas phase under the condition of two-phase lubrication, and the equivalent viscosity of gas-liquid two-phase mixed fluid is deduced. The Reynolds equation of gas-liquid mixed lubrication between the end surfaces of hydrodynamic seal was established. The finite element software MATLAB is used to solve the Reynolds equation of gas-liquid mixed lubrication. The pressure distribution and sealing performance parameters of the gas-liquid mixed fluid between the end surfaces of the dynamic pressure seal are obtained. The effect of liquid-gas ratio on the sealing performance is analyzed when the operating conditions are fixed. The results show that under the same film thickness, the droplet enhances the hydrodynamic pressure effect on the end face, and the gap, friction power consumption and mass leakage rate increase with the increase of the liquid-gas ratio during the operation of the hydrodynamic seal. The volume leakage rate decreases with the increase of the liquid-gas ratio, while the stiffness increases first and then decreases with the increase of the liquid-gas ratio, and there is a maximum value.
【作者单位】：北京化工大学机电工程学院;
【基金】：国家重点基础研究发展计划项目(973计划)(2012CB026000)
【分类号】：TH136

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