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Supercritical carbon dioxide (S-CO2) Brayton cycle systems are emerging as highly promising energy power systems with extensive potential applications. Gas bearings are ideal for supporting the shafts of S-CO2 rotating machinery due to their oil-free operation, high-speed capabilities, resistance to high temperatures, and system simplicity. In the actual operating conditions of high-speed, heavy-load S-CO2 units, common occurrences such as variations in lubricant flow state, temperature increase, and pad elasticity deformation significantly affect the operational stability of the bearing rotor systems. This study investigates S-CO2 multi-pad tilting pad journal bearings, employing a combination of finite difference methods and finite element methods to develop a comprehensive thermo-elasto-hydrodynamic (TEHD) lubrication model that accounts for turbulence, real gas effects, thermal influences, and pad elastic deformations. A comparative analysis of lubrication performance under hydrodynamic, thermohydrodynamic (THD), and TEHD models is presented. It also investigates the impacts of different operating conditions, parameters, and S-CO2 variable thermal properties on the static performance of the bearings. The results demonstrate that pad elastic deformation modifies the curve shape near the minimum film thickness, thereby reducing film pressure, which becomes significant under conditions of high eccentricity and heavy load.

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Thermal Elasto-hydrodynamic Lubrication Characteristics Analysis of Supercritical Carbon Dioxide Tilting Pad Bearings

  • 章节

  • 发表日期：

    2025年

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  • Shuxiang Yi,
  • Weiwei Zhang,
  • Ruiyun Shi,
  • Yi Ju,
  • Xiaojing Wang

摘要

Supercritical carbon dioxide (S-CO2) Brayton cycle systems are emerging as highly promising energy power systems with extensive potential applications. Gas bearings are ideal for supporting the shafts of S-CO2 rotating machinery due to their oil-free operation, high-speed capabilities, resistance to high temperatures, and system simplicity. In the actual operating conditions of high-speed, heavy-load S-CO2 units, common occurrences such as variations in lubricant flow state, temperature increase, and pad elasticity deformation significantly affect the operational stability of the bearing rotor systems. This study investigates S-CO2 multi-pad tilting pad journal bearings, employing a combination of finite difference methods and finite element methods to develop a comprehensive thermo-elasto-hydrodynamic (TEHD) lubrication model that accounts for turbulence, real gas effects, thermal influences, and pad elastic deformations. A comparative analysis of lubrication performance under hydrodynamic, thermohydrodynamic (THD), and TEHD models is presented. It also investigates the impacts of different operating conditions, parameters, and S-CO2 variable thermal properties on the static performance of the bearings. The results demonstrate that pad elastic deformation modifies the curve shape near the minimum film thickness, thereby reducing film pressure, which becomes significant under conditions of high eccentricity and heavy load.