关键词: 羽流, 天然气, 低温, 凝结, 数值分析

Abstract:

When a large number of LNG suddenly leaks and evaporates, it will form a low temperature cloud in the wind downstream, which may cause frostbite, burn and oxygen deficit hazard to the ground personnel. Based on the computational fluid dynamics (CFD) method, the two-phase multicomponent flow mathematical framework together with the turbulence closure are built to model the cryogenic flow. The phase-change mass transfer of water vapor in the air due to the temperature depression is considered. Because of the existence of non-liquefied gases such as oxygen, the Hertz-Knudsen equation for calculating the mass transfer rate of water vapor is modified. Detailed methods for setting the boundary conditions of the computational domain are presented and the influence of Coriolis force caused by the earth rotation is evaluated. The Burro experimental series of LNG released by LLNL are simulated and the results are used to evaluate the numerical models. It is found that the results using models with the phase change of water vapor are closer to the experimental results than that without the phase change. The studies are of directive significance for the safety environment assessment and design of LNG received terminal.

Key words: plume flow, NG, cryogenic, condensation, numerical analysis