润滑油中不凝结气体对滑动轴承间隙流场特性影响研究

doi:10.3901/JME.2016.12.152

摘要/Abstract

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。

关键词: 不凝结气体, 滑动轴承, 气液两相流

Abstract: The oil lubricating hydrodynamic journal bearing is an important load-bearing component of the large rotating machinery. In its clearance, the hydrodynamic-pressured and cavitation effect coexist, forming the gas-liquid two phase flow, the characteristics of which affect both the bearing performance and safety operation of the equipment. The influence of non-condensable gas(NCG) contend in lubricating oil is investigated. It is considered that NCG can cause the oil to deviate from its nominal performance and involve in the gas-liquid mass transfer process. The coupling relationship between hydrodynamic-pressured and cavitation effect based on the flow feature in bearing clearance is present; moreover, a 3D flow field simulation model using the two phase flow theory of computational fluid dynamics(CFD) is set up. The full cavitation model and gas-liquid mixture model are applied in the approach. It is concluded that the flow characteristic trend is piecewise, a certain series of features applying to a certain interval of the NCG’s domain. The characteristic of the flow, such as the max pressure, the max gas contend and the bearing load force, tend to be non-monotone with the change of NCG contend, there is a peak interval. Calculation results also show that the migration of the pressure field distribution area, and phase field distribution occur with the NCG variation.

Key words: gas-liquid two phase flow, journal bearing, non-condensable gas

中图分类号:

TK263

郭瑞, 赵国瑶, 王志芳, 傅行军, 杨建刚, 朱晓东. 润滑油中不凝结气体对滑动轴承间隙流场特性影响研究[J]. 机械工程学报, 2016, 52(12): 152-157.

GUO Rui, ZHAO Guoyao, WANG Zhifang, FU Xingjun, YANG Jiangang, ZHU Xiaodong. Studies on the Influence of Non-condensable Gas Contended in Lubricating Oil on Performance of Hydrodynamic Journal Bearing[J]. Journal of Mechanical Engineering, 2016, 52(12): 152-157.

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