基于高阶单元的滑动轴承润滑特性计算

Calculation of lubrication performance of journal bearings based on the theory of high-order element

为了研究高阶单元对润滑计算的影响,本文以某船用滑动轴承为研究对象进行研究,依据流体动压润滑理论和高阶单元理论,以非结构网格技术划分润滑区域,采用非结构格点型有限体积法求解二维雷诺方程,进而建立基于高阶单元的滑动轴承润滑计算模型。通过润滑计算发现:在保证节点数目一致时,高阶单元的数目较少,但是最大压强值、油膜反力、端泄流量和摩擦系数等结果更接近参考值;高阶单元参与润滑计算时,耗时相对较长,但是精度相对较高。本文高阶单元理论可以较好地应用于滑动轴承润滑特性的求解。

A marine sliding bearing is selected as the research subject to investigate the effect of high-order element on the calculation of lubrication.On the basis of theories of hydrodynamic lubrication and high-order element,the lubrication region is meshed with unstructured grid technology,and the 2D Reynolds equation is solved by the non-structural grid finite volume method.Thus,the calculation model of sliding bearing's lubrication is established based on high-order element.Computation results of lubrication show that when the number of nodes is consistent,the amount of high-order element decreases,but the maximum pressure,the counterforce of oil film,the end leakage flow,and the friction coefficient are close to the reference value.When the high-order element is considered in the lubrication calculation,the calculation time is prolonged,but the precision is relatively increased.The theory of high-order element can be applied to the solution of lubrication characteristics of sliding bearings.