自然循环下钠冷快堆中迷宫型节流件水力特性研究  

Study on Hydraulic Characteristics of Labyrinth Throttle in SodiumCooled Fast Reactor under Natural Circulation

作　　者：周志伟[1] 曹锋[2] 陆道纲[2] 曹琼[2] ZHOU Zhiwei;CAO Feng;LU Daogang;CAO Qiong(China institute of atomic energy,Beijing 102413,China;Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy,North China Electric Power University,Beijing 102206,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]华北电力大学非能动核能安全技术重点实验室,北京102206

出　　处：《核科学与工程》2023年第5期979-988,共10页Nuclear Science and Engineering

摘　　要：迷宫型节流件常被安装在钠冷池式快堆主容器冷却系统、泵冷却系统等流动旁路中,使得进入这些旁路的流量达到设计值,来有效冷却设备,保证快堆的安全。目前国内对自然循环条件下节流件的阻力特性研究较少,本文对迷宫节流件在自然循环和强制循环两种条件下进行了实验和数值研究。首先,实验采用恒定温度(84℃)的液态水作为工质,得到了两种循环条件下节流件的阻力系数;其次,对节流件进行数值模拟,将不同湍流模型、壁面法向网格间距下的数值模拟结果与实验结果进行了比较,验证了数值模拟的有效性;最后,通过比较不同湍流模型的计算结果和流场细节,得出适合于两种条件下迷宫式节流件数值模拟的湍流模型,并发现回流漩涡是节流件的主要耗能方式,两种条件下模拟结果的差异主要集中在二次回流区域大小的不同,自然循环下回流区域明显大于强制循环,且收缩速度较慢。Labyrinth throttles are often installed in the flow bypass of the main vessel cooling system and pump cooling system of sodium cooled pool fast reactor,so that the flow entering these bypass reaches the design value,so as to effectively cool the equipment and ensure the safety of fast reactor.At present,there are few domestic research on the resistance characteristics of throttle under natural circulation.Therefore,this paper makes experimental and numerical research on labyrinth throttle under natural circulation and forced circulation. Inthe experiment, liquid water with constant temperature(84 ℃)was used as the working medium,and the resistance coefficients of throttling parts under two cycle conditions wereobtained.Then, the throttle is numerically simulated, and the numerical simulation resultsunder different turbulence models and the normal grid spacing of the wall are compared withthe experimental results, which verifies the validity of the numerical simulation.By comparingthe calculation results and flow field details of different turbulence models, a turbulence modelsuitable for the numerical simulation of labyrinth throttle under two conditions is obtained.Atthe same time, the difference of the flow field of the throttle under the two conditions iscompared.It is found that the reflux vortex is the main energy consumption mode of the throttle,and the difference of the simulation results under the two conditions is mainly concentrated inthe size of the secondary reflux area.Under natural circulation, the reflux area is significantlylarger than that under forced circulation, and the contraction speed is slow.

关 键 词：迷宫型节流件 水力特性 湍流模型 数值模拟 

分 类 号：TL48[核科学技术—核技术及应用]