蒸发冷却电机中汽液两相沿程摩擦阻力的研究  

Research on Two-phase Flow Frictional Pressure Drop in the Evaporative Generator

作　　者：郭朝红[1] 余顺周[1] 蔡静[2] 顾国彪[1] 

机构地区：[1]中国科学院电工研究所,北京市海淀区100080 [2]北京长城计量测试技术研究所,北京市海淀区100095

出　　处：《中国电机工程学报》2006年第19期139-144,共6页Proceedings of the CSEE

摘　　要：该文旨在提高蒸发冷却电机中冷却介质两相流动的沿程摩擦阻力的计算精度。用5种计算方法(2种均相模型计算方法,L-M方法,Chisholm方法和Friedel方法)计算冷却介质两相流动的摩阻放大倍数和沿程摩擦阻力;以李家峡400兆瓦蒸发冷却电机为参照,搭建起两相流实验台,在0.146～0.152MPa压力范围内对冷却介质的两相流动进行了实验研究。在2.59、3.45、4.3g/s3种流量条件下比较实验数据与计算结果后发现,基于分相模型的L-M方法对放大倍数和沿程摩擦阻力的预测结果最准确,最大误差不超过15%,根据冷却介质的流量修正系数C后,计算精度大大提高,误差不超过6%。这说明修正后的L-M方法可以应用于蒸发冷却电机的设计计算,为冷却系统的循环计算奠定了理论基础。The prediction correlation of two-phase flow frictional resistance is modifiod in order to accurately predict the refrigerant frictional resistance in the evaporative generator. Five correlations（two homogeneous correlations, L-M, Chisholm, and Friedel correlations） were used to predict the frictional resistance in stator hollow conductors, and a two-phase flow experimental stand was established according to Lijiaxia 400MW evaporative generator to do research at 0.146-0.152MPa. The comparison between the calculated results and the experimental data at 2.59g/s, 3.45g/s and 4.3g/s shows that the L-M correlation is the most precise correlation, and the maximum error doesn＇t exceed 15%. When the coefficient C is modified with variety of the mass flow flux, the relative error becomes less than 6%. So the modified L-M correlation is applicable for engineering calculation of the evaporative cooling system.

关 键 词：蒸发冷却电机 定子空心导线 两相流 摩擦压降 L—M方法 

分 类 号：TM301[电气工程—电机]