【摘要】 主泵在失水工况下，水润滑推力轴承会失去冷源换热，带来复杂的热瞬态影响。针对主泵下飞轮区域推力盘的结构特点及失水工况条件，建立下飞轮-推力盘系统有限元模型，对上、下推力盘的轴向变形进行分析。结果表明，在失水工况下，推力盘在内部不均匀温度作用下产生使液膜厚度减小的热变形，在飞轮端板与推力盘之间环形水隙引发的非均匀水压作用下，产生使液膜厚度增大的弹性变形；揭示弹性变形对于热变形的补偿作用，减轻失水工况对推力盘变形影响。比较不同转速下发生失水工况后推力盘的变形情况发现：低转速发生失水工况时，弹性变形减小，推力盘的轴向变形量更大，会增加轴承润滑失效的可能性，在主泵运行中应避免该工况的发生。更多还原

【Abstract】 In the loss of cooling water condition, the water-lubricated thrust bearing of the main pump will lose cold source heat exchange, resulting in complex thermal transient influence. Based on the structural characteristics and loss of cooling water condition of the thrust runner in the lower flywheel area, a finite element model of the flywheel thrust runner system was established to analyze the axial deformation of the thrust runner. The results indicate that in loss of cooling water condition, the thrust runner undergoes thermal deformation that reduces the thickness of the liquid film due to uneven internal temperature, and elastic deformation that increases the thickness of the liquid film due to uneven water pressure caused by the annular water gap between the flywheel end plate and the thrust runner. The compensating effect of elastic deformation on thermal deformation is revealed and the influence of loss of cooling water condition on thrust runner deformation is reduced. Comparing the deformation of the thrust runner after loss of cooling water at different speeds, it is found that at low speeds, the elastic deformation decreases and the axial deformation of the thrust runner increases, which increases the possibility of bearing lubrication failure. This condition should be avoided during the operation of the main pump.更多还原