基于两相流理论的滑动轴承流场计算分析  

Simulation of Journal Bearing Flow Field Using Computational Fluid Dynamics Two Phase Flow Theory

作　　者：张楚[1] 杨建刚[1] 郭瑞[1] 孙丹[1] 

机构地区：[1]东南大学火电机组振动国家工程研究中心,江苏省南京市210096

出　　处：《中国电机工程学报》2010年第29期80-84,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50875045)~~

摘　　要：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%。The paper seted up a new journal bearing flow field simulation model using the two phase flow theory of computational fluid dynamics（CFD）.The model treated the divergence region of bearing as the mixed region full of oil and gas,which was different with the traditional Reynolds and CFD single phase flow model.The new model was more consistent with the experimental observed results in the negative pressure region.The paper compared the calculated load difference of a test bearing among the two phase model,the single phase flow model and the Reynolds model.Comparisons of calculation results difference among the three models were also done for a typical bearing model.It shows that although the calculated maximum pressure is almost the same,there is difference among the calculated load.Load calculated by the two phase flow theory is more consistent with the experimental result.The calculated load difference increased with the increasing eccentricity.This was caused by the existence of large negative pressure in the bearing divergence region.Calculation results also show that the mean cavitation ratio increases with the increasing rotating speed,eccentricity,vaporization pressure and the decreasing inlet pressure.Though the time needed for an iteration step is relatively large,the two phase flow CFD model converges more quickly than the single phase model.Less calculation time is required in the end.

关 键 词：滑动轴承 两相流 计算流体力学 负压区 汽化比例 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]