Numerical simulation of working fluid effects on two-phase flow in LMMHD power generation system
1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China; 2. College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 210016, China
Abstract：To improve the transport rate of two-phase flow with low-boiling point working medium and liquid metal in liquid metal magneto hydro dynamic (LMMHD) system, the numerical simulation was carried out to choose working fluid. The low-boiling point working mediums of trifluoro-trichloro-ethane and chloroform and the liquid metal of tin and gallium were selected respectively, and the physical process of the liquid metal with low-boiling point working medium vapor was numerically studied by CFD simulation software. Based on the simulation results and theoretical analysis, the effects of working fluid type on the transport characteristics of gas-liquid two-phase flow were discussed. The results show that under the condition of liquid metal without intrusion, the low boiling point working medium with low molecular weight, small latent heat, small heat capacity and high density and the liquid metal with high density, large heat capacity and high heat conductivity are more conducive to transport gas-liquid two-phase flow. The boiling point of low-boiling point working medium and the melting point of liquid metal should be chosen according to the application objects.
2017, Vol. 38 
