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.Cited