基于CFD的动静压轴承多相流水膜承载力研究

发布时间：2018-03-28 23:11

本文选题：深浅腔轴承　切入点：空化　出处：《润滑与密封》2017年11期

【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。
[Abstract]:Based on the Realizable k- 蔚 turbulence model, the Euler multiphase flow model in the CFD simulation software is used to solve the Navier-Stokes equation in the fluid domain of deep and shallow cavity bearing, and the cavitation effect is taken into account. The effects of different journal speed and eccentricity on the distribution of water film pressure field and gas holdup were studied, and the DPM model was used. The influence of impurity particle mass fraction and particle diameter on the water film bearing capacity is analyzed. The results show that the water film bearing capacity increases with the increase of rotational speed and eccentricity, and the maximum pressure peak appears at the end of the convergent shallow wedge cavity. The gasification area expands with the increase of rotational speed, and the phenomenon of gasification at both ends of the divergent wedge deep cavity is significant; with the increase of particle mass fraction, the maximum pressure and bearing capacity increase slightly; the influence of large particles on the bearing capacity of water film is significant. When the particle size is close to the minimum film thickness, the maximum pressure and bearing capacity of the water film will be increased significantly, and the friction and wear of the bearing will also be aggravated.
【作者单位】：太原理工大学机械工程学院;
【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)
【分类号】：TH133.36

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