滑动轴承两种油膜边界条件的比较

本文对滑动轴承计算中两种常用的油膜边界条件进行了比较，一种是雷诺边界条件，另一种即质量守恒边界条件。对于前者，常采用负压力归零法进行计算，对于后者，大多采用Elrod算法。本文通过改变Elrod算法中的变量θ的定义，对Elrood算法进行改进，建立一新的通用方程，可自动确定动态边界，并在稳态工况下，将两种边界条件的计算结果与实验数据进行比较，发现根据质量守恒边界条件采用本文新改进的算法计算所得结果与实验数据十分吻合，同时，计算结果表明，空穴并不总是降低轴承的承载力，在稳态工况下，当空穴压力为较大的负压力时，轴承的承载能力反而有明显提高。

A Comparison between Two Boundary Conditions of Journal Bearings

A comparison between two boundary conditions, Reynolds boundary condition and mass conserving boundary condition , which are usually used in the numerical calculation of journal bearings is carried out In this paper, based on mass conserving boundary condition, a new cavitation algorithm is brought out to constitute a universal equation to describe oil film pressure field which can determine moving boundary automatically By comparing the numerical results of different boundary conditions and algorithms with experimental data, it is found that film pressure predicted by the new algorithm has good agreement with experimental data At the same time, the calculating results indicate that the cavitation does not always have a negative effect on the load carrying capacity of bearings For steady state, the low pressure in the cavitated area will increase the load carrying capacity of bearings