基于质量守恒边界条件的应力偶流体润滑动载轴承特性  

Performance of Dynamically Loaded Journal Bearing with Couple Stress Fluids Considering Mass-conserving Boundary Condition

作　　者：张俊岩[1] 王晓力[1] 

机构地区：[1]北京理工大学机械与车辆工程学院,北京100081

出　　处：《机械工程学报》2010年第15期102-106,共5页Journal of Mechanical Engineering

基　　金：国家自然科学基金(10872031);教育部111创新引智计划资助项目

摘　　要：基于应力偶流体理论和改进的Elrod空穴算法对动载轴承的润滑性能进行数值摸拟。求解质量守恒边界条件的动载Reynolds方程,结果表明:与Reynolds边界条件下的结果相比,采用质量守恒边界条件得到的平均进油流量与平均端泄流量更加接近,更符合实际情况。数值求解基于质量守恒边界条件下,应力偶流体润滑的动载Reynolds方程,比较牛顿流体和应力偶流体对轴承的最大油膜压力、最小油膜厚度和端泄流量的不同影响。结果表明:应力偶流体使得动载轴承的最大油膜压力减小,最小油膜厚度明显增大,端泄流量减小,提高了动载轴承的承载能力。Based on the couple stress fluid theory and the modified Elrod’s cavitation algorithm, the lubrication performance of dynamically-loaded journal bearings is numerically simulated. With the mass conserving boundary condition ,the Reynolds equation under dynamic loads is solved. Comparisons are made between the average inflow and the average leak flow. The results show that the average inflow and average leak flow based on the mass conserving boundary condition are equal, which is more agreeable with the fact. Comparisons are made between the Newtonian fluids and couple stress fluids for the effects on the oil film pressure, the minimum oil film thickness and the leak flow. It can be found that the couple stress fluids yield an obvious increase in the oil film thickness and the load capacity, but a decrease in the oil film pressure and the leak flow.

关 键 词：动载轴承 应力偶流体 空穴 质量守恒边界条件 

分 类 号：TH113[机械工程—机械设计及理论]