不同管径管外含空气/CO_(2)蒸汽冷凝传热特性分析  

Analysis of the heat transfer characteristics of steam condensation containing air/CO_(2)outside the tubes with different diameters

作　　者：彭翔 边浩志[1,2] 周书航 李文涛 曹夏昕 PENG Xiang;BIAN Haozhi;ZHOU Shuhang;LI Wentao;CAO Xiaxin(College of Nuclear Science and Technology,Harbin Engineering University,Harbin 150001,China;Heilongjiang Provincial Key Laboratory of Nuclear Power System&Equipment,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学核科学与技术学院,黑龙江哈尔滨150001 [2]哈尔滨工程大学黑龙江省核动力装置性能与设备重点实验室,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2023年第7期1220-1226,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(52106236).

摘　　要：当反应堆发生严重事故时,堆芯熔融物可能与安全壳中的混凝土发生相互作用,产生大量CO_(2)并释放到安全壳的气空间中。为了研究CO_(2)对安全壳内蒸汽冷凝的影响,本文采用数值模拟的方法对不同管径条件下竖直圆管外含空气/CO_(2)的蒸汽冷凝传热特性进行了数值模拟分析,考察了CO_(2)浓度的变化在不同条件下对含不凝性气体的蒸汽冷凝的影响。研究结果表明:在不同管径条件下,CO_(2)的存在都会增大冷凝传热系数,提升幅度可达30%以上。此外,传热管管径与CO_(2)的引入都不会改变局部冷凝传热系数在传热管轴向上的分布趋势,即由传热管顶部至底部,局部冷凝传热系数先迅速降低后缓慢增大。When a severe accident occurs in a reactor,a molten core-concrete interaction may occur,producing a large amount of CO_(2)and releasing it into the gas space of the containment.In this paper,to study the effect of CO_(2)on steam condensation in a containment,a numerical simulation method is used to analyze the heat transfer characteristics of steam condensation containing air/CO_(2)outside a vertical tube and investigate the influence of the change in CO_(2)concentration on the steam condensation containing noncondensable gas under different conditions.The results revealed that under different diameter conditions,the existence of CO_(2)increases the condensation heat transfer coefficient(CHTC)by more than 30%.Furthermore,the introduction of tube diameter and CO_(2)did not change the axial distribution trend of local CHTC on the heat transfer tube;that is,the local CHTC first decreases rapidly and then increases slowly from the top to the bottom of the tube.

关 键 词：竖直圆管 蒸汽冷凝 不凝性气体 二氧化碳 多组分气体 不同管径 换热系数 数值计算 

分 类 号：TL331[核科学技术—核技术及应用]