滑动轴承中不凝结气体对转子性能影响研究  

Effect of Non-condensable Gas on Rotor-journal Bearing System

作　　者：张硕 李强[1] 王玉君 许伟伟[2] 王振波[1] ZHANG Shuo;LI Qiang;WANG Yu-Jun;XU Wei-Wei;WANG Zhen-Bo(College of chemical engineering, China university of petroleum (East China), Qingdao 266580, China;College of Pipeline and Civil Engineering, China university of petroleum (East China), Qingdao 266580, China)

机构地区：[1]中国石油大学(华东)化学工程学院,青岛266580 [2]中国石油大学(华东)储运与建筑工程学院,青岛266580

出　　处：《工程热物理学报》2019年第7期1511-1519,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51506225);山东省重点研发计划资助项目(No.2018GHY115018);中央高校基本科研业务费专项资金资助(No.18CX02129A);中国石油大学(华东)研究生创新工程资助项目(No.YCX2018030,No.YCX2019040)

摘　　要：针对滑动轴承现场使用时,不凝结气体(Non-condensable gases,NCG)使润滑介质物性参数偏离标称性能的问题,首先,建立了滑动轴承内部液态-气态润滑介质-NCG组成的多相润滑流场数值模型,其次,通过自编程序实现了瞬态润滑流场与转子动力学方程之间的耦合计算,再次,通过计算与试验结果的对比说明了计算方法的有效性,最后,分析了NCG含量对于转子工作性能的影响。结果表明:NCG含量对于转子工作状态有明显影响。随着NCG含量的增加,转子静平衡位置逐渐下降,转子涡动轨迹逐渐变大,因此使得轴瓦与轴颈接触风险增加。静平衡位置处最高压力上升,高压区面积减小,空化范围加大,增加了轴瓦疲劳和气蚀的风险;NCG含量增加会引起切向油膜力做功增大,有助于提高转子稳定性。Existence of non-condensable gases(NCG)results that lubricant parameters deviate from the nominal performance when journal bearings are used.For this investigation,a numerical model of multiphase lubricant flow field composed of liquid lubricant-gaseous lubricant-NCG in journal bearings is established.Then,the coupling calculation between transient lubricant flow field and rotor dynamic equation is realized by self-programming.The validity of the calculation method is illustrated by comparing the calculated results with the experimental ones.Finally,the influence of NCG content on the performance of the rotor is analyzed.The results show that the NCG content has a considerable effect on the working state of the rotor.With the increase of NCG content,the static equilibrium position of the rotor decreases,and the whirling orbit of the rotor increases gradually,which increases the contact risk between bearing bush and journal.The maximum pressure at the static equilibrium position rises,the area of high pressure zone decreases,and the cavitation range increases,which increases the risk of bearing bush fatigue and cavitation.Meanwhile,the increase of NCG content will increase the work of tangential oil film force and help to improve the stability of the rotor.

关 键 词：滑动轴承 不凝结气体 静平衡 涡动轨迹 稳定性 

分 类 号：TH133[机械工程—机械制造及自动化]