FLiBe、FLiNaK在涡流二极管中流动特性的数值模拟  

Numerical simulation of FLiBe and FLiNaK's flow characteristics in vortex diode

作　　者：戴悦来 戴志敏[1] 吴燕华[1] 

机构地区：[1]中国科学院上海应用物理研究所嘉定园区,上海201800 [2]中国科学院大学,北京100049

出　　处：《核技术》2014年第5期69-74,共6页Nuclear Techniques

摘　　要：涡流二极管作为一种非能动制止阀的设备,被应用于高温熔盐堆的概念设计中,本文利用FLUENT数值模拟分析了涡流二极管内正反向流动的阻力特性及其内部流场,以水、FLiBe和FLiNaK为模拟工作介质,计算了在不同工况下,涡流二极管的正反向流动压降值、阻力系数及阻抗比,为用于钍基熔盐堆(Thorium Molten Salt Reactor,TMSR)非能动辅助冷却系统的涡流二极管设计提供参考依据。模拟计算结果表明:涡流二极管的正反向流阻随着进口雷诺数不断增大,其性能参数阻抗比ε随着雷诺数也相应增大,最后达到临界稳定值;为提高其性能参数阻抗比,对涡流二极管进行结构优化设计,并结合实验进行验证。Background： As a passive check valve, vortex diode is applied to the design of several fluoride salt-cooled high-temperature reactors. It is installed in the emergency heat removal system that is designed to passively remove reactor decay heat under natural circulation. Purpose： By analyzing FLiBe and FLiNaK＇s fluidic performance in vortex diode by numerical simulation and comparing with that of water, we could provide a reference for the design of vortex diode applied for the Pool Reactor Auxiliary Cooling System （PRACS） of Thorium Molten Salt Reactor （TMSR）. Methods： According to the conceptual design of PRACS, a model of vortex diode was simulated under different working conditions by using Fluent. Taking measures of the best tangential angle and the converging-diverging axial tube is to get better performance. Results： The forward and reverse pressure drops increase with the flow rate, and the diodicity is related to the Reynolds number of working medium, and increases with Re number until a certain value, where the diodieity basically remains unchanged. After structure optimization, the value of diodicity is enhanced to some extent. Conclusion： Based on the results, there is a critical Re number both for FLiBe and FLiNaK in vortex diode. Optimizing the structure design of the vortex diode can improve FLiBe and FLiNaK＇s performances in vortex diode.

关 键 词：涡流二极管 FLIBE FLiNaK 性能参数 结构优化 

分 类 号：TL334[核科学技术—核技术及应用]