摘要
超临界二氧化碳动力循环系统对实现节能减排的目标有着十分积极的作用。针对一种箔片气体动压轴承结构建立了计算模型,并通过拟合非理想状态气体超临界二氧化碳的密度与压力之间的关系,基于传热学模型和气体润滑能量方程分析了轴承气膜温升,结合实际运行过程中出现的湍流效应修正润滑气体雷诺方程、耦合力学分析模型和能量方程,分析S-CO_(2)介质箔片气体动压轴承的静特性,并与空气作为介质进行对比分析不同系统参数和湍流参数对轴承特性的影响规律。结果表明:相较于空气而言,使用超临界二氧化碳作为润滑介质的箔片气体动压轴承具有较高的承载力,而且在一定范围内随着轴承直径和宽度的增加、偏心率的上升、轴承间隙的减小、转速的提高等,轴承承载力均可以增大;对于湍流影响因素来说,在一定范围内随着局部雷诺数和湍流系数的增加、气体动力黏度和密度的提高、高温环境下环境温度的降低等,轴承承载力将会增大。
The supercritical carbon dioxide power cycle system has a very positive effect on the realization of energy saving and emission reduction goals.In this paper,a calculation model is proposed for a foil gas dynamic pressure bearing structure.By fitting the non-ideal state gas supercritical carbon dioxide,the relationship between density and pressure is established.Based on the heat transfer model and the gas lubrication energy equation,the temperature rise of the bearing gas film is analyzed.The Reynolds equation of the lubricating gas is corrected in combination with the turbulent effect in the actual operation process,coupled with the mechanical analysis model,Reynolds equation and energy equations,the static characteristics of foil gas dynamic pressure bearings are analyzed,and compared with air as a medium to analyze the influence of different system parameters and turbulence parameters on the bearing characteristics.The results show that compared with air,the foil gas dynamic pressure bearing using supercritical carbon dioxide as the lubricating gas has a higher bearing capacity,and within a certain range,the bearing capacity can increase with the increase of bearing diameter and width,eccentricity,the rotational speed and the reduction of the bearing clearance.For the turbulent influencing factors,within a certain range,the bearing capacity can increase with the increase of the local Reynolds number and turbulence coefficient,aerodynamic viscosity,density for ambient gas and the decrease of ambient temperature.
作者
朱鹏程
管玉坤
门日秀
程振宇
冯凯
ZHU Peng-cheng;GUAN Yu-kun;MEN Ri-xiu;CHENG Zhen-yu;FENG Kai(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;Science and Technology on Diesel Engine Turbocharging Laboratory,China North Engine Research Institute,Tianjin 300400,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2024年第5期875-884,共10页
Journal of Vibration Engineering
基金
国家重点研发计划项目(2021YFF0600208)。
关键词
箔片气体动压轴承
雷诺方程
超临界二氧化碳
承载力
gas foil bearing
Reynolds equation
supercritical carbon dioxide
bearing capacity
