基于Fluent动网格的径向气体轴承数值模拟  

Numerical Simulation of Radial Gas Bearings Based on Fluent Moving Grid

作　　者：邹宜鑫 冷雪 钟良[1] 杜国才 ZOU Yixin;LENG Xue;ZHONG Liang;DU Guocai(School of Manufacturing Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China;Sichuan Electronic and Mechanic Vocational College,Mianyang 621010,China)

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010 [2]四川省电子机械职业技术学院,四川绵阳621010

出　　处：《机械》2024年第6期15-21,共7页Machinery

基　　金：四川省科技厅重点项目(20QYCX0073)。

摘　　要：以双排孔径向气体轴承为研究对象,应用UG软件建立径向气体静压轴承的气膜模型,应用Fluent软件对气膜模型进行仿真分析。采用小扰动法即在轴颈上加载一个简谐激励代替主轴工作时的振动,结合动网格技术借助瞬态计算方法,计算出气体静压轴承的刚度和阻尼系数。研究了不同工作条件转速、偏心率以及供气压力对气体静压轴承刚度的影响规律,为气体静压轴承等相关设备的研究提供理论依据。通过实验对仿真方法进行验证,对比了仿真和实验结果,仿真值和实验值的误差不超过5.5%,证明仿真计算的可靠性。结果表明:转速和偏心率对于刚度和阻尼均有一定影响。当转速为250~1250r/min时,转速越大阻尼越小刚度越大;当偏心率为0.1~0.4时,偏心率越大阻尼越大刚度越小。This paper focuses on the double-row aperture radial gas bearing.A gas film model of the radial gas hydrostatic bearing is established through the design software Unigraphics,and the computational fluid dynamics software Fluent is then used to simulate and analyze the gas film model.The small perturbation method,which involves loading a simple harmonic excitation on the journal to replace the spindle vibration during the operation,and the dynamic mesh technology assisted with transient calculation methods are utilized to calculate the stiffness and damping coefficients of the hydrostatic bearings.The study investigates the impact of rotational speed,eccentricity,and gas supply pressure on the stiffness of the hydrostatic bearings under various working conditions,providing a theoretical foundation for the research of hydrostatic bearings and related equipment.The simulation method is validated through experiments by comparing the simulation and experimental results,showing an error of less than 5.5%,which demonstrates the reliability of the simulation calculation.The study indicates that stiffness and damping is affected by rotational speed and eccentricity.Within the rotational speed range of 250 r/min to 1250 r/min,higher speeds result in lower damping and higher stiffness.When the eccentricity ranges from 0.1 to 0.4,higher eccentricity results in higher damping and lower stiffness.

关 键 词：FLUENT 动网格 气体轴承 

分 类 号：TH133.35[机械工程—机械制造及自动化]