摘要
以无限宽径向滑动轴承为研究对象,考虑油膜中同时存在层流和紊流两种流态,基于层流、紊流润滑理论,联立求解雷诺方程、能量方程和温黏方程,分析油膜中流态变化,得到压力分布、承载力、摩擦力和最高温度等特性参数。结果表明:随着转速的升高和偏心率的增大,油膜内流体从完全层流转变为完全紊流要经过一个复杂的流态变化过程;与单一层流流态相比,混合流态下油膜承载力和摩擦力较大,温升较高,黏度变化较大,这表明流态的改变和热效应对轴承特性有着不可忽略的影响,在计算轴承特性时,应准确判断油膜中流态,并考虑热效应的影响。
The static characteristic of the infinite wide hydrodynamic journal bearing was investigated theoretically assumed that the laminar flow and turbulent regimes, so-called coexistence flow state, existed simultaneously in the oil film. Based on the lubrication theory of two flow regimes, by solving the coupling governing equations of bearing such as Reynolds equation, energy equation and temperature- viscosity equation, the changes of flow regimes in the oil film were analyzed and the pressure, carrying-capacity, friction and maximum temperature fields were obtained. The results show that, there is a complex process for the fluid transition from pure laminar flow regime to pure turbulent flow regime in the oil film along with the increasing of shaft rotation speed and eccentricity. Compared with pure laminar flow state, bigger load-carrying capacity and friction, higher temperature rise and bigger viscosity change of the fluid are found under coexis- tence state, indicating that the influence on the bearing static lubrication characteristics by the change of flow regimes and the thermal effect can not be ignored, the flow regimes of oil film should be accurately judged and the thermal effect should be taken into account when calculating the bearing characteristics.
出处
《润滑与密封》
CAS
CSCD
北大核心
2014年第5期41-46,共6页
Lubrication Engineering
基金
国家自然科学基金项目(51075373)
河南省基础与前沿技术研究计划项目(132300410068)
河南省教育厅自然科学研究计划项目(2011A460011)
关键词
滑动轴承
层流
紊流
静特性
radial sliding bearing
laminar flow
turbulence
static characteristics
