自然循环系统流动-阻力特性理论和实验研究  

Theoretical and Experimental Investigation on Flow-Resistance Performance of Natural Circulation System

作　　者：吴磊[1] 贾海军[1] 刘洋 张涛 马计中 杨星团[1] 

机构地区：[1]清华大学核能与新能源技术研究院,先进核能技术协同创新中心,北京100084 [2]中核能源科技有限责任公司,北京100193

出　　处：《核动力工程》2016年第3期10-15,共6页Nuclear Power Engineering

基　　金：国防科工局民用核能“NHR-200Ⅱ型核供热堆关键技术研究和关键设备验证”项目;国家自然科学基金委创新研究群体科学基金项目(51321002)

摘　　要：通过实验研究发现,自然循环系统中自然循环流量与加热功率以及自然循环流量和系统总阻力之间分别存在关系:G^Q~m和Δp_t^G~q,分别定义m和q为流量-功率特征数和流动-阻力特征数。考虑自然循环系统局部阻力和沿程阻力的作用,采用拟合逼近的方法求解得到自然循环系统热工参数之间的近似解析关系,与实验结果吻合较好。研究表明,流量-功率特征数m与整个系统流动状态和阻力特性密切相关,是系统雷诺数Re和系统局部阻力系数和沿程阻力系数比值R_n的函数,且m随着R_n的增大逐渐减小。自然循环系统流动-阻力特征数与流量-功率特征数存在关系q=(1-m)/m,并得到实验验证。Experiments prove that the relations between the natural circulation capacity G and the heating power Q, and the total flow resistance Apf and the natural circulation capacity G are： G ~ Qm and △pf- Gq, respectively. Power indexes of m and q are defined as the natural circulation flow rate-heating power characteristic number and the natural circulation flow-resistance characteristic number, respectively. In consideration of the effects of local resistance and frictional resistance, the analytical relations about thermal parameters are obtained by using approximation and fitting approach, and they also have good agreement with the experimental results. It is indicated that the natural circulation flow rate-heating power characteristic number m has a close relation with the flow resistance characteristics, and it is a function of Reynolds number Re and the ratio of the local resistance coefficient and the frictional resistance coefficient R, in the natural circulation system. Its value decreases with the increasing of Rn. In addition, the relation between the natural circulation flow-resistance characteristic number q and the natural circulation flow rate-heating power characteristic number m is： q=（1-m）/m, which is validated by the experiment.

关 键 词：自然循环 流动-阻力特性 NHR-200Ⅱ 

分 类 号：TL331[核科学技术—核技术及应用]