考虑表面粗糙度与空化效应的组合密封润滑分析  

Combined seal lubrication analysis under influence of surface roughness and cavitation effect

作　　者：张毅[1] 熊子杰 李大建[2] 熊思阳 钟思鹏 ZHANG Yi;XIONG Zijie;LI Dajian;XIONG Siyang;ZHONG Sipeng(School of Mechanical Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Oil and Gas Technology Research Institute of Changqing Oilfield Branch of CNPC,Xi′an,Shaanxi 710018,China)

机构地区：[1]西南石油大学机电工程学院,四川成都610500 [2]中国石油天然气股份有限公司长庆油田分公司油气工艺研究院,陕西西安710018

出　　处：《排灌机械工程学报》2024年第4期388-394,425,共8页Journal of Drainage and Irrigation Machinery Engineering

基　　金：四川省自然科学基金资助项目(2022NSFSC0276)。

摘　　要：为了研究表面粗糙度及空化效应对压裂泵柱塞密封副密封性能的影响,基于稳态Reynolds方程,建立了粗糙峰和空化效应影响下组合密封的弹流润滑数值模型.在数值模拟基础上,采用有限体积法求解稳态Reynolds方程,研究了密封副在表面粗糙度影响下的油膜厚度、油膜压力、油膜流速分布规律,以及不同的往复速度和滑环表面粗糙度对密封性能的影响.结果表明,外行程流体动压效应微弱,油膜在空气侧附近会出现空化现象;较高的往复速度有利于减小泄漏量及摩擦阻力;滑环表面粗糙度从0.8μm增加到1.8μm时,净泄漏量与外行程摩擦力分别升高了180.4%和11.17%.因此,在工作过程中应设置较高的往复速度和使用较低粗糙度的滑环以提高密封性能.To study the influence of surface roughness and cavitation effect on the sealing performance of the plunger seal pair of fracturing pump,based on the steady Reynolds equation,the elastohydrodynamic lubrication numerical model of the combined seal under the influence of asperity and cavitation effect was established.On the basis of numerical simulation,the finite volume method was adopted to solve the steady-state Reynolds equation to study the distribution of film thickness,film pressure and film velocity under the influence of surface roughness,and the influence of different reciprocating velocity and slip-ring surface roughness on the sealing performance.The results show that the dynamic pressure effect in outstroke is weak,and the cavitation phenomenon occurs near the air side of the contact area.Higher reciprocating speed is beneficial to reduce the leakage and friction resistance.When the slip-ring surface roughness increases from 0.8μm to 1.8μm,the net leakage and friction of outstroke increase by 180.4%and 11.17%,respectively.Therefore,it is proposed to apply higher reciprocating speed and lower roughness slip-ring in the working process to improve the sealing performance.

关 键 词：压裂泵柱塞密封副 表面粗糙度 混合润滑模型 密封性能 

分 类 号：TH137[机械工程—机械制造及自动化]