结构参数对开式自然循环流动特性的影响  

Effects of the Structural Parameters on the Flow Characteristics of an Open Natural Circulation System

作　　者：郭雪晴 周少伟[1] 宋振国[1] GUO Xue-qing;ZHOU Shao-wei;SONG Zhen-guo(China Ship Development and Design Center,Wuhan 430064,China)

机构地区：[1]中国舰船研究设计中心,武汉430064

出　　处：《船海工程》2022年第S02期57-61,共5页Ship & Ocean Engineering

摘　　要：建立一维均相平衡模型,对可用于非能动热量导出的大尺度开式自然循环系统的瞬态流动特性进行数值模拟,并分析系统结构参数对其流动特性的影响。结果表明,大尺度开式自然循环系统的流动会经历启动、单相流动、过渡阶段和近似两相稳定流动4个过程,上升段内产生的闪蒸及闪蒸诱发的流量振荡是过渡阶段产生流动不稳定的原因。增加绝热管段高度或直径都能加快单相流动阶段的循环流动,但增加上升段高度对两相阶段的流动影响较小;增大上升段直径对单相流动影响较小,却能增加近似两相稳定流动阶段的循环流量。The one-dimensional homogeneous equilibrium model was developed to simulate the transient flow characteristics of the large scale open natural circulation system which can be used for passive containment cooling system,and the effects of the structural parameters on the flow characteristics of the system were analyzed.The results showed that the big scale open natural circulation will experience four different phases,including start-up process,single phase flow,transition phase and approximate stable two-phase flow.The flow instability occurring in the transition phase is the results of the flashing and flashing-induced oscillation in the riser.It can be seen from the sensitivity studies that both increasing the height and the diameter of the adiabatic sections can accelerate the single-phase flow,but increasing the height of the riser has little influence on the flow rate of the two-phase flow.Increasing the diameter of the riser section has little effect on the single-phase flow but can accelerate the two-phase flow significantly.

关 键 词：非能动热量导出系统 开式自然循环 闪蒸 

分 类 号：U664.15[交通运输工程—船舶及航道工程]