润滑油中不凝结气体对滑动轴承间隙流场特性影响研究

发布时间：2018-05-12 03:43

本文选题：滑动轴承 + 气液两相流　；参考：《机械工程学报》2016年12期

【摘要】：油润滑滑动轴承是大型旋转机械中承担转子动静载荷的重要部件,在间隙内动压与空化效应并存,形成复杂的气液两相流场,其特性直接影响轴承宏观性能及设备安全稳定运行。在现场工作条件下,润滑油通常含有一定量的不凝结气体(Non-condensable gas,NCG),不仅会使油品物性参数偏离标称性能,也会参与气液两相间的传质过程。基于轴承间隙内润滑油的流动特点,提出了流场中存在动压-空化耦合关系,并结合气液混合相模型及全空化模型对间隙内三维流场进行数值求解。结果表明:在NCG的影响下,流场特性的演化具有阶段性,在不同的NCG质量分数区间内流场特性表现不同;最大压力、最大气体体积分数及承载力的幅值随NCG质量分数的变化是非单调的,存在有最大值;压力场、相态场的分布面积、位置及承载力的方向随NCG质量分数变化而发生偏移。
[Abstract]:Oil-lubricated sliding bearing is an important part of large rotating machinery to bear the dynamic and static load of rotor. The dynamic pressure and cavitation effect coexist in the clearance, forming a complex gas-liquid two-phase flow field. Its characteristics directly affect the macro performance of bearing and the safe and stable operation of the equipment. Under the field working conditions, the lubricating oil usually contains a certain amount of non-condensable gas NCGG, which not only makes the physical properties of the oil deviate from the nominal performance, but also participates in the mass transfer process between the gas and liquid phases. Based on the characteristics of lubricating oil flow in the bearing clearance, a hydrodynamic cavitation coupling relationship is proposed, and the three-dimensional flow field in the clearance is numerically solved by combining the gas-liquid mixed phase model and the full cavitation model. The results show that, under the influence of NCG, the evolution of flow field characteristics is phased, and the characteristics of flow field are different in different NCG mass fraction regions, the maximum pressure is the maximum pressure. The variation of the maximum gas volume fraction and bearing capacity with NCG mass fraction is non-monotone and there is a maximum value, and the pressure field, the distribution area of phase state field, the position and the bearing capacity direction are offset with the change of NCG mass fraction.
【作者单位】：东南大学火电机组振动国家工程研究中心;
【基金】：国家自然科学基金(51206025) 教育部博士点基金(20120092120013)资助项目
【分类号】：TH133.31

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