Thursday August 29, 2019 from 13:30 to 15:10
Simulation and analysis of the influence of wind flow on the evolution of hydrogen vapor cloud
Yuanliang Liu1, Gang Lei2, Jianjian Wei1, Tao Jin1.
1Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou, People's Republic of China; 2State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing, People's Republic of China
Potential hazards should be seriously assessed and avoided when handing liquid hydrogen, such as the flammable vapor cloud and the low temperature injury.
A three-dimensional CFD model for liquid hydrogen dispersion is developed, with the guidelines proposed by the Working Group of the Architectural Institute of Japan constructing the wind environment. Spills with different wind speeds and vertical wind flow profiles are numerically investigated.
The cloud’s dimension in streamwise direction is positively correlated with the wind speed. The increased wind speed and vertical speed gradient hinder the cloud from rising up. The duration of the flammable cloud increases first and then decreases, with the increment in wind speed, indicating that the dilution time is related to both the wind turbulence and the windward area for a buoyant cloud.
The investigations reveal the mechanisms and characteristics of hydrogen cloud evolution in different wind flows.