Ball bearings in liquid rocket turbopumps usually generate a large amount of power loss as they operate under extreme conditions, including cryogenic fluids, solid lubrications and extra high loads and speeds. However, to explore the power loss mechanism, a bearing theoretical model considering the influence of cryogenic fluid and solid lubricant is needed. In this paper, by introducing the newly developed fluid resistance forces and the rolling contact traction model into the equilibrium equations of the bearing, a new fluid-structure interaction-based quasi-static model is proposed, which can well simulate the rolling-sliding behaviour of balls under solid lubrication conditions. Based on tribology and kinematic analysis, eight power loss components of the bearing are deduced. The proposed model is validated by comparison with both experiments and existing theoretical methods. The results show that sliding, spinning and hydraulic power losses are the most important components of the bearing. Moreover, tribological behaviour, including creeping, skidding and spinning of the ball, is a key factor affecting the distribution of the power loss components. Utilizing the proposed model, the proportion of load-dependant power loss can be optimized to improve the anti-wear and heat-resisting properties of cryogenic ball bearings.

液体火箭涡轮泵中的滚珠轴承在极端条件下运行时通常会产生大量功率损失，包括低温流体、固体润滑以及超高负载和速度。然而，为了探索功率损失机制，需要考虑低温流体和固体润滑剂影响的轴承理论模型。本文通过将新开发的流体阻力和滚动接触牵引模型引入轴承的平衡方程，提出了一种新的基于流固耦合的准静态模型，可以很好地模拟滚动滑动行为固体润滑条件下的球。基于摩擦学和运动学分析，推导出轴承的八个功率损耗分量。通过与实验和现有理论方法的比较，验证了所提出的模型。结果表明，滑动、旋转和液压动力损失是轴承最重要的组成部分。此外，摩擦学行为，包括球的蠕动、打滑和旋转，是影响功率损耗分量分布的关键因素。利用所提出的模型，可以优化负载相关功率损耗的比例，以提高低温球轴承的抗磨损和耐热性能。是影响功率损耗元件分布的关键因素。利用所提出的模型，可以优化负载相关功率损耗的比例，以提高低温球轴承的抗磨损和耐热性能。是影响功率损耗元件分布的关键因素。利用所提出的模型，可以优化负载相关功率损耗的比例，以提高低温球轴承的抗磨损和耐热性能。