等温密封环摩擦状态演变预测与试验研究  

Prediction and Experimental Research on Evolution for Frictional Contact of Isothermal Sealing Ring

作　　者：宫燃[1] 车华军[1] 李洪武[2] 杨富春[3] 

机构地区：[1]江苏大学江苏省汽车工程重点实验室,镇江212013 [2]中国北方车辆研究所,北京100072 [3]浙江大学机械工程学系,杭州310027

出　　处：《机械工程学报》2011年第17期66-71,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51005104);江苏大学校基金(10JDG033)资助项目

摘　　要：结合浮动密封环的工作特点,提出一种基于载荷分配概念的密封摩擦状态演变预测模型。设定载荷分配系数,对粗糙表面微凸体接触和流体润滑接触两个部分摩擦力进行建模计算,根据微凸体承载力和总承载力等参数信息获得总摩擦因数值。模拟计算获得反映密封接触特性的摩擦因数与转速、压力以及表面粗糙度的关系曲线,仿真曲线历经完整的摩擦与润滑区,能够对不同摩擦状态下的接触特性进行预测。利用密封系统试验台对模型进行分析和验证,结果表明两者变化趋势保持一致,具有共同特征,说明密封摩擦预测模型能够真实反映密封摩擦副的接触规律及其变化情况,是预测密封摩擦状态的有效方法。According to the working conditions of sealing rings,the prediction model is presented for frictional contact in the sealing system based on load-sharing concept.Setting the load-sharing factor,the total applied load is supported by the combination of hydrodynamic film and asperity contact.The total friction coefficient is determined by the friction force of hydrodynamic film,asperity contact and contact load.The results are plotted as a function of the velocity,pressure and surface roughness which cover the entire lubrication condition including full-film,mixed-lubrication and boundary-lubrication.An experimental investigation is performed in the dynamic sealing performance test rig by comparison of numerical and experimental results to enable an assessment of the accuracy level.Experimental results indicate that virtual prediction data agree well with test data.Consequently the proposed model can investigate the influence of operating condition on the behavior of friction coefficient efficiently,and a reliable approach is provided to predict the contact state of sealing ring.

关 键 词：密封环 摩擦状态 摩擦因数 粗糙表面 

分 类 号：TH117[机械工程—机械设计及理论]