两种空化边界条件下的旋转密封润滑状态分析与试验  

Analysis and Experiment of Lubrication Condition of Rotary Seal Based on Two Cavitation Boundary Conditions

作　　者：赵一民[1] 魏超[1] 苑士华[1] 

机构地区：[1]北京理工大学车辆传动国防科技重点实验室,北京100081

出　　处：《兵工学报》2014年第12期1937-1943,共7页Acta Armamentarii

基　　金：国家自然科学基金项目(51105031;51175038)

摘　　要：针对JFO与Reynolds空化边界条件,建立了螺旋槽旋转密封润滑状态分析的理论模型,分析不同空化边界条件下旋转密封润滑状态的转变过程;采用分形接触模型描述混合润滑状态时的粗糙峰接触特性。分析结果表明:Reynolds空化边界条件下的模型可预测较大的流体承载力,但大大低估了空化区,特别是在高转速工况下;稳态工况下,JFO空化边界条件下的模型可预测更高的工作转速,使旋转密封从混合润滑状态转变为流体动力润滑状态。试验结果表明:两种空化条件下计算的泄漏量与试验结果变化趋势相同;但相比于Reynolds边界条件,JFO边界条件可预测更小的泄漏量,与试验结果更为接近,尤其是在高转速工况下。For JFO and Reynolds cavitation boundary conditions,a theoretical lubrication condition model of spiral-groove rotary seal is established.Lubrication state transitions are analyzed by theoretical model based on different cavitation conditions.In the mixed lubrication state,the asperity contact properties are described by fractal contact model.The results show that Reynolds boundary condition can be used to predict larger fluid carrying capacity,but apparently underestimate the cavitation area especially in high speed conditions; In steady operating state,JFO boundary condition can be used to predict higher separation speed which makes the rotary seal transfer from mixed lubrication to hydrodynamic lubrication.The experimental results indicate that the theoretical leakages of two cavitation boundary conditions and the experimental results have the same variation tendency.However,compared with Reynolds boundary condition,JFO boundary condition is used to predict smaller leakages,which are more close to the experiment results,particularly in high speed condition.

关 键 词：兵器科学与技术 旋转密封 JFO空化边界条件 Reynolds空化边界条件 润滑状态 

分 类 号：TB42[一般工业技术]