水压摩擦副中的压力与流量特性  

Pressure and Flow-rate Characteristics in Water Hydraulic Friction Pairs

作　　者：刘桓龙[1] 柯坚[1] 王国志[1] 于兰英[1] 

机构地区：[1]西南交通大学机械工程学院,成都610031

出　　处：《机械科学与技术》2007年第1期45-48,共4页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家863计划青年基金项目(2004AA616240);西南交通大学校基金项目(2005A09)资助

摘　　要：水的低粘度使得水压润滑间隙中的惯性力与粘性力几乎处于同一数量级,因此研究摩擦副的润滑特性时,不能忽略惯性力的影响。惯性力的作用可能改变间隙流场的局部甚至全局流态,从层流变为紊流,因此应用经典润滑理论所得的计算结果将产生太大的误差。采用CFD方法从N-S方程出发对水压摩擦副中压力与流量特性的惯性影响和表面粗糙度效应进行了研究,并与经典润滑理论结果进行了对比,发现表面粗糙度和惯性力对润滑间隙中的压力和流量特性均有一定的影响。其中,惯性力对端面摩擦副中的压力分布具有一定的影响,对端面副和径向副的泄漏流量均有影响,并且惯性力使得表面粗糙度对流场流态的影响得以体现,因此以N-S方程而不是雷诺方程为模型所得的计算结果更加准确。Because the low viscosity of water makes its inertia force in the water hydraulic lubrication gap have almost the same order of magnitude as its viscosity force, its inertia force cannot be ignored during the study of the lubrication characteristics of its friction pairs. The effect of inertia force can change the local or even whole flow pattern in the gap flow field, and then the laminar flow possibly becomes turbulent. For these reasons, the calculation results from the classical lubrication theory could be very inaccurate. Based on the N-S equations, CFD is used to study the inertia and surface roughness effects on the pressure and flow-rate characteristics of water hydraulic friction pairs, and the study results are compared with those from the classical lubrication theory. The results indicate that the surface roughness and inertia force both have some effect on the pressure and flow-rate characteristics in the lubrication gap. Speaking separately, the inertia force has some effect on the pressure distribution in the end-face friction pairs and on the face roughness obviously N-S equations should be leakage flow-rate in both end-face and radial friction pairs. Furthermore, it makes the suraffect the flow pattern in the flow field. Therefore, the Reynolds equations rather than the used in order for the calculation results to be more accurate.

关 键 词：水压技术 摩擦副 惯性 表面粗糙度 压力 流量 

分 类 号：TV134[水利工程—水力学及河流动力学]