S-CO2箔片气体动压轴承静动态特性分析

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (14) : 131-141.

论文

S-CO2箔片气体动压轴承静动态特性分析

曲智旭1，郝开元2，杨靖贵1，朱鹏程1，刘水华1，李文俊1，冯凯1

作者信息 +

Static and dynamic analysis of gas foil bearings lubricated by supercritical carbon dioxide

QU Zhixu1，HAO Kaiyuan2，YANG Jinggui1，ZHU Pengcheng1，LIU Shuihua1，LI Wenjun1，FENG Kai1

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文章历史 +

摘要

以超临界二氧化碳(supercritical carbon dioxide,S-CO2)为介质的动力循环系统因其结构紧凑、效率高、能源清洁等优势受到广泛的关注。针对S-CO2介质径向箔片气体动压轴承建立力学计算模型，通过物性数据库获取S-CO2物性数据并基于BP神经网络训练S-CO2物性模型，与变黏度变密度的湍流气体润滑雷诺方程进行耦合。利用热平衡计算轴承气膜的平均温升，计算S-CO2径向箔片气体动压轴承的静态特性并对程序进行验证。基于小扰动法计算动态刚度与阻尼系数，分析雷诺数、静态承载和轴承名义间隙对S-CO2介质径向箔片轴承动态特性的影响规律。结果表明:利用神经网络训练获得的S-CO2物性模型，获取到的不同温度与压力状态下的S-CO2物性值可靠性相当高。适当增大局部雷诺数，减少名义间隙，提高静态载荷，可以获得更好的轴承动态性能。

Abstract

The power circulation system that utilizes supercritical carbon dioxide (S-CO2) as the medium has garnered widespread attention due to its compact structure, high efficiency, and energy cleaning. This study builds a mechanical model for gas foil bearings (GFBs) lubricated by the S-CO2. The property data of S-CO2 are obtained from the database, and the property model of S-CO2 is trained based on the BP neural network. The property model is coupled with the Reynolds equation of turbulent gas lubrication with variable viscosity and density. The average temperature rise of the bearing gas film is calculated through the thermal balance equation. The static mechanical model is verified, and the static characteristics of GFBs lubricated by the S-CO2 are calculated. Based on the small perturbation method, the dynamic stiffness and damping coefficient are calculated, and the influence of Reynolds number, static load, and nominal clearance on the dynamic characteristics of GFBs lubricated by the S-CO2 is analyzed. The results showed that the S-CO2 property model obtained through neural network training embraces high reliability. By appropriately increasing the Reynolds number, reducing the nominal clearance, and increasing the static load, a better dynamic performance of the GFBs can be obtained.

导出引用

曲智旭1, 郝开元2, 杨靖贵1, 朱鹏程1, 刘水华1, 李文俊1, 冯凯1. S-CO2箔片气体动压轴承静动态特性分析[J]. 振动与冲击, 2024, 43(14): 131-141

QU Zhixu1, HAO Kaiyuan2, YANG Jinggui1, ZHU Pengcheng1, LIU Shuihua1, LI Wenjun1, FENG Kai1. Static and dynamic analysis of gas foil bearings lubricated by supercritical carbon dioxide[J]. Journal of Vibration and Shock, 2024, 43(14): 131-141

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