两相自然循环流量漂移分岔特性数值模拟  

Numerical study on bifurcation characteristics of two phase natural circulation flow excursion

作　　者：杨东雪 高璞珍 

机构地区：[1]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,哈尔滨150001

出　　处：《中国科技论文》2015年第11期1343-1346,共4页China Sciencepaper

摘　　要：为了研究自然循环的静态不稳定特性,通过对一个实验系统建立两相自然循环物理模型和数学模型,编程计算了两相情况下自然循环流量,研究自然循环流量漂移不稳定性的静态分岔特性及其影响因素。其中在实验段内,单相和两相段由净蒸汽产生点划分,净蒸汽产生点由萨哈-朱伯模型计算,两相摩擦压降采用均相流模型计算。最终得到了流量漂移的分岔特性曲线,并给出了相应的两相自然循环的稳定性准则,同时讨论了实验段入口欠热度、系统压力对分岔特性曲线的影响,并比较了分相流与均相流模型的计算结果。结果表明,提高入口温度、提高系统压力有利于系统稳定,分相流的计算结果比均相流稳定。To study the static instabilities of natural circulation, one computation program is designed to calculate the flow of two phase natural circulation by building the physical and mathematical model of an experimental system. The bifurcation characteris- tics of two phase natural circulation flow excursion and the effects of parameters are studied. The single and two phase flow in the experimental setting is divided by the net vapor generation point which is obtained by the Saha-Zuber equation. The homogeneous flow model is adopted to calculate two phase friction pressure drop. The static bifurcation characteristic curve of flow excursion is gained and the corresponding stable rules for two phase natural circulation are also provided. Meanwhile, the effects of inlet tem- perature and system pressure on static bifurcation characteristic curve are discussed. The results of separated flow model are com- pared with the homogenous flow model results. The results show that improving the inlet temperature and pressure are good for stability. The result of separated flow model is better than homogenous model.

关 键 词：自然循环 不稳定性 流量漂移 分岔特性 

分 类 号：TL334[核科学技术—核技术及应用]