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将计算流体动力学(CFD)两相流与动网格技术应用于滑动轴承动力特性数值求解,建立了基于CFD两相流滑动轴承动力特性求解模型,该模型无需设定油膜破裂边界条件且更能准确模拟滑动轴承流场特性.比较了单相流与两相流滑动轴承压力分布特性,计算分析了滑动轴承气穴分布特征及其影响因素,研究了两相流模型对滑动轴承动力特性的影响.计算结果表明:气化比例随着转速、偏心率和气化压力的增加而迅速增大,随进口压力的增加而缓慢减小.考虑两相流后,直接刚度系数增加,交叉刚度系数减小,直接与交叉阻尼系数均减小.随着偏心率的增加,单相流与两相流动力特性系数求解结果偏差增大.
The computational fluid dynamics (CFD) two-phase flow and moving grid technique are applied to solve the dynamic characteristics of the sliding bearing. The dynamic characteristics of the sliding bearing based on CFD are established. The model does not need to set the boundary condition of oil film fracture and more Which can accurately simulate the flow field characteristics of the sliding bearing.The pressure distribution characteristics of the single-phase flow and two-phase flow sliding bearings are compared, the cavitation distribution and its influencing factors are calculated and analyzed, and the dynamic characteristics of the sliding bearing The calculated results show that the gasification rate increases rapidly with the increase of rotational speed, eccentricity and gasification pressure, and decreases slowly with the increase of inlet pressure.After considering the two-phase flow, the direct stiffness coefficient increases and the cross-rigidity coefficient decreases Small, direct and cross-damping coefficients all decrease.With the increase of eccentricity, the deviations of single-phase flow and two-phase flow coefficient coefficients increase.