BA Qingxin1, ZHAO Mingbin1, ZHAO Zeying1, HUANG Teng1, WANG Jianqiang2, LI Xuefang1, XIAO Guoping2
1. Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China; 2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract：Unintended high pressure hydrogen releases and ignition are key scenarios in hydrogen accidents, so they are basic topics of hydrogen safety research. This study modeled three hydrogen fire scenarios including immediate ignition, delayed ignition, and delayed ignition with a barrier wall. The analyses predicted the temperature and pressure distributions for each scenario. The results show that immediate ignition of the released hydrogen resulted in a steady jet fire without significant overpressure. Delayed ignition caused a pressure wave at the ignition location that spread outward. The jet fire for delayed ignition was similar as that for immediate ignition after the fire stabilized. The overpressure decreased with distance from the ignition location. The barrier wall weakened the spread of the pressure waves and the flames with significantly lower overpressures and temperatures behind the wall. Therefore, barrier walls should be used to reduce hazardous areas and shorten separation distances.
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2022, Vol. 62 
