紊流滑动轴承油膜承载力的近似解

随着旋转机械向高转速、大功率方向发展，作为支承的滑动轴承越来越多地工作在紊流工况。为了能够快速准确地分析其润滑性能，给出了基于Sommerfeld和Ocvirk数的一种有限长紊流滑动轴承非线性油膜承载力的近似解析表达式。通过采用多参数摄动原理对有限长紊流滑动轴承润滑的Reynolds方程进行了求解，计算得到了滑动轴承的油膜承载力，并与有限元法计算的结果进行了比较，验证了基于多参数摄动原理求解紊流滑动轴承承载力近似解析方法的正确有效性。在此基础上，分析了偏心率、宽径比对滑动轴承的轴承承载力以及压力分布的影响。计算结果表明该近似解析方法适用于求解各种宽径比轴承的油膜承载力，尤其在较大的偏心率和载荷范围内适用。

Approximate Solution of Load-Carrying Capacity of Turbulent Flow Sliding Bearing

More and more sliding bearings operate in turbulent regime due to the requirements of higher speed, higher power in rotating machinery. In order to analyze the lubrication characteristics of sliding bearings efficiently and save computational cost, an approximate solution of load-carrying capacity of oil film of finite length turbulent flow bearing is proposed based on Sommerfeld and Ocvirk number. Reynolds equation in lubrication of finite length turbulent journal bearing is solved based on multi-parametric perturbation principle. Load-carrying capacity of nonlinear oil film is obtained and comparison of the results obtained by different methods is made. The validation of the proposed method is verified. Then the influence of the change of the eccentricity and the width-to-diameter ratio on the load-carrying capacity and pressure distribution is discussed. The numerical results show that the proposed method not only approximates the load-carrying capacity of sliding bearings with varied width-to-diameter ratios efficiently, but also is suitable for those situations with large eccentricity ratio and high load.