Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (05): 50603-050603.doi: 10.11889/j.0253-3219.2014.hjs.37.050603

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

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

DAI Yuelai1,2 DAI Zhimin1 WU Yanhua1   

  1. 1(Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China) 2(University of Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2014-02-15 Revised:2014-04-07 Online:2014-05-10 Published:2014-05-08

Abstract:

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 diodicity 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.

Key words: Vortex diode, FLiBe, FLiNaK, Performance parameters, Structure optimization