计入应力偶效应和空化效应的滑动轴承热流体动力润滑数值研究

基于应力偶理论和Elrod空化算法建立了滑动轴承热流体动力润滑数学模型，数值求解了应力偶流体的Reynolds方程、油膜能量方程及轴瓦热传导方程，考察了应力偶效应对滑动轴承热流体动力润滑性能产生的影响。结果表明：应力偶流体明显地提高了油膜压力，降低了轴承摩擦系数，同时也使端泄流量和轴承的温度场有所改变。

A NUMERICAL STUDY OF THE THERMOHYDRODYNAMIC PERFORMANCE OF JOURNAL BEARINGS CONSIDERING THE EFFECTS OF COUPLE STRESS AND CAVITATION

Based on the couple stress fluid model and Elrod’s cavitation algorithm, a numerical model of the thermo-hydrodynamic lubrication of journal bearings is built up. The midified Reynolds equation and the midified energy equation of oil film together with the heat transfer equation of the bush are solved. The effects of couple stress on the thermohydrodynamic performance of a finite journal bearing are investigated. It is found that the couple stress fluids, compared with the Newtonian fluids, not only produce an obvious increase in load capacity and a decrease in friction coefficient, but also yield a change in the side leakage flow and the temperature field of oil and bush.