大型空分装置用低温液体膨胀机内流及轴向推力数值计算  

Numerical investigation and calculation of axial thrust of a cryogenic liquid turbine in large scale air-separation unit

作　　者：赵问银 王科[2] 宋鹏[2] 

机构地区：[1]开封空分集团有限公司设计研究院,开封475002 [2]西安交通大学能源与动力工程学院,西安710049

出　　处：《低温工程》2012年第2期16-21,共6页Cryogenics

基　　金：国家"863计划"资助项目(2007AA05Z202);国家自然科学基金资助项目(51006078)支持

摘　　要：对大型内压缩流程空分装置用低温液体膨胀机在不同工况下的整级流场进行了数值模拟计算,预测了不同工况下转子的轴向力水平,对影响轴向力的因素进行了参数化研究。数值结果显示,轴向力随着流量的增加而线性地缓慢增加;随着轴封密封齿与转子间的间隙增大,轴向力迅速减小并反向;轴向力计算的结果为改进和进行轴向力平衡结构的设计提供了相应的依据。同时,通过分析、对比计算轴向力的两种方法(数值模拟和经验公式法)所得的结果,指出了经验公式法计算轴向力的局限性和改进的方向。Numerical investigation was performed for a single stage cryogenic liquid turbine in the large-scale internal compression air-separation unit and prediction of the impeller axial thrust was obtained at different conditions.To identify the influential factors of axial thrust,geometry parametric study was carried out numerically.The results indicate that the axial thrust increases as turbine flow rate increases linearly,the axial thrust is sensitive to the shaft seal gap size and it decreases evidently as the size increases.The obtained results provide a good basis to balance the axial thrust and obtain a moderate one.For the purpose of comparison,the empirical method was used to predict the axial thrust load.The obtained results were compared to the numerical ones and deviation of the empirical from the numerical method was analyzed and highlighted.

关 键 词：液体膨胀机 轴向力 CFD 轴向力平衡 

分 类 号：TB653[一般工业技术—制冷工程]