Simulation of thermal hazards from hydrogen under-expanded jet fire |
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| Affiliation: | 1. Centre de Recherche Paris-Saclay, Air Liquide Research & Development, 1, chemin de la Porte des Loges, Les Loges-en-Josas – BP 126, 78354 Jouy-en-Josas, France;2. Fluidyn, 7 Boulevard de la Libération, 93200 Saint-Denis, France;3. APSYS, 37 Ave Normandie Niemen, 31700 Blagnac, France;4. CEA, DEN, DANS/DM2S/STMF/LATF, 91191 Gif-Sur-Yvette, France;5. ODZ Consultants, 174 Avenue Jean Jaurès, 69007 Lyon, France;1. Gexcon, Fantoftvegen 38, 5072, Bergen, Norway;2. Impetus Afea, Strandgaten 32, 4400, Flekkefjord, Norway;1. FC-EV Research Division, Japan Automobile Research Institute, 1328-23, Takaheta, Osaka, Shirosato, Ibaraki, 311-4316, Japan;2. Department of Environmental Science, Toho University, 2-2-1, Miyama, Funabashi, Chiba, 274-8510, Japan |
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| Abstract: | Thermal hazards from an under-expanded (900 bar) hydrogen jet fire have been numerically investigated. The simulation results have been compared with the flame length and radiative heat flux measured for the horizontal jet fire experiment conducted at INERIS. The release blowdown characteristics have been modelled using the volumetric source as an expanded implementation of the notional nozzle concept. The CFD study employs the realizable k-ε model for turbulence and the Eddy Dissipation Concept for combustion. Radiation has been taken into account through the Discrete Ordinates (DO) model. The results demonstrated good agreement with the experimental flame length. Performance of the model shall be improved to reproduce the radiative properties dynamics during the first stage of the release (time < 10 s), whereas, during the remaining blowdown time, the simulated radiative heat flux at five sensors followed the trend observed in the experiment. |
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| Keywords: | CFD Jet fire High pressure Hydrogen safety Radiative heat transfer Under-expanded jet |
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