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提出采用计算流体力学(computation fluid dynamic,CFD)两相流理论建立滑动轴承流场求解模型。该模型认为负压区内油与油汽混合存在,更符合实际情况。比较了两相流模型计算结果和实验结果的差别以及3种模型计算结果之间的差别。3种模型求出的最大油膜压力基本相同,而载荷有所差别。考虑负压区内的油膜作用后,两相流模型求出的有效载荷与实验数据更加吻合。单/两相流模型求出的载荷差随着偏心率的增加而增大。油膜汽化比例随转速、偏心率和汽化压力的增大而增大,随进油压力的增大而减小。虽然两相流模型每步迭代所需的时间较长,但是两相流模型收敛速度快,总的计算时间大约只是单相流模型的44%。
A computational fluid dynamics (CFD) two-phase flow theory is proposed to establish the flow field model of a sliding bearing. The model considers that oil and oil vapor are mixed in the negative pressure zone, which is more in line with the actual situation. The differences between the two-phase flow model calculation results and the experimental results and the differences between the three models are compared. The maximum oil film pressures obtained by the three models are basically the same, but the loads are different. After considering the effect of oil film in negative pressure zone, the effective load obtained by two-phase flow model is more consistent with the experimental data. The load difference found with the single / two-phase flow model increases as the eccentricity increases. The vaporization rate of oil film increases with the increase of speed, eccentricity and vaporization pressure, and decreases with the increase of oil pressure. Although the two-phase flow model requires longer time for each iteration, the two-phase flow model converges at a faster rate, and the total calculation time is only about 44% of the single-phase flow model.