Estimation of flammable region through experimental observation of liquid hydrogen cloud leaked under various atmospheric conditions

Hydrogen is garnering attention as a future energy source due to its environmentally friendly characteristics and high energy density. However, it is crucial to recognize the risks associated with hydrogen, stemming from its extensive flammable range and rapid flame speed. Establishing safety distance criteria and conducting hazard analysis require the collection of data on the behavior of leaked liquid hydrogen under various weather conditions. In this study, a simulated atmospheric chamber is designed to mimic atmospheric conditions, and reliable data is being acquired for trend analysis in various leakage scenarios. Ultimately, the flammable area is most influenced by wind speed, and utilizing hydrogen in environments with temperatures above a certain threshold can minimize the likelihood of accidents resulting from leaks.