【摘要】 高速、大功率的机组工况条件使得超临界二氧化碳（S-CO₂）轴承工作在紊流润滑状态。以S-CO₂动压轴承为研究对象，基于Fluent软件建立轴承气膜仿真分析模型，采用广泛使用的两方程standard k-ε紊流模型，分析不同轴承偏心对气膜压力和承载力的影响，同时用经典的Ng-Pan紊流润滑模式进行计算对比。研究结果表明，两种紊流模式下S-CO₂轴承的压力分布在正压区更为吻合，并在此基础上分析了standard k-ε紊流模型下实际气体效应对轴承特性的影响。更多还原

【Abstract】 The high speed and high power unit conditions make the supercritical carbon dioxide（S-CO₂） bearings work in turbulent lubrication. In this paper, the S-CO₂ hydrodynamic bearing is used as the research object, and a simulation analysis model of the bearing gas film is established based on Fluent software. The widely used two-equation standard k-εturbulent flow model is used to analyze the effect of different bearing eccentricities on the gas film pressure and load capacity, and the classical Ng-Pan turbulent flow lubrication mode is also used for calculation and comparison. The results show that the pressure distribution of the S-CO₂ bearing under the two turbulent flow models is more consistent in the positive pressure region, and the influence of the real gas effect on the bearing characteristics under the standard k-ε turbulent flow model is analyzed on this basis.更多还原