基于CFD的动静压轴承多相流水膜承载力研究  

Research on Load Carrying Capacity of Multi-phase Flow Water Film of Hybrid Bearing Based on CFD Method

作　　者：陈超[1] 张宏[1] 刘邱祖[1] 

机构地区：[1]太原理工大学机械工程学院,山西太原030024

出　　处：《润滑与密封》2017年第11期79-83,共5页Lubrication Engineering

基　　金：山西省软科学研究项目(2012041038-01);山西省研究生教育创新项目(2017SY030)

摘　　要：以深浅腔轴承流体域为研究对象,基于Realizable k-ε湍流模型,运用CFD模拟软件中的欧拉多相流模型求解Navier-Stokes方程,在计入空化效应下,研究不同轴颈转速和偏心率对水膜压力场分布和气含率的影响;采用DPM模型,分析固定工况下杂质颗粒质量分数和颗粒直径对水膜承载力的影响。结果表明:随着转速和偏心率的增加,水膜承载力有所增大,且最大压力峰值出现在收敛楔浅腔末端;气化区域随着转速的增大而不断扩大,其中发散楔深腔两端气化现象显著;随着颗粒质量分数的增加,最大压力和承载力略有提升;大颗粒对于水膜承载力的影响显著,当粒径接近于最小膜厚时,水膜最大压力和承载力将显著提高,同时也加剧了轴承的摩擦磨损。Taking the fluid domain of deep/shallow recessed bearing as the research object, the Navier-Stokes equations was solved by the Eulerian multi-phase flow model in CFD simulation software, and based on the Realizable k-epsilon tur-bulence model.Taking into account the cavitation effect,pressure distribution of water film and vapor volume fraction was studied under different journal rotational speed and eccentricity.DPM model was adopted to analyze the influence of mass fraction and diameter of the impurity particles on the load-carrying capacity under the fixed condition. Results show that with the increasing of rotational speed and eccentricity, load-carrying capacity is increased, and the maximum pressure peak appears at the end of the shallow recess of the convergent wedge.The cavitation region is enlarged with the increasing of ro-tational speed,including significant cavitation phenomenon on both ends of deep recess of the divergent wedge.The maxi- mum pressure and load-carrying capacity are increased slightly with the increasing of particle mass fraction.Larger impurity particles has significant effects on the load-carrying capacity, when particle diameter is close to the minimum film thick-ness, the maximum pressure and loading capacity will rise significantly, but the friction and wear of the bearing is also aggravated.

关 键 词：深浅腔轴承 空化 杂质颗粒 水膜承载力 

分 类 号：TH133.37[机械工程—机械制造及自动化]