PIV-measurements of reactant flow in hydrogen-air explosions |
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| Affiliation: | 1. Institute of Energy and Climate Research (IEK-6), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany;2. Institut de Radioprotection et de Sûreté Nucléaire (IRSN), 92262 Fontenay-aux-Roses, France;3. Institut de Combustion Aérothermique Réactivité et Environnement (ICARE), Centre National de La Recherche Scientifique (CNRS), 45071 Orléans, France;4. Institute of Reactor Safety and Reactor Technology (LRST), RWTH Aachen University, 52062 Aachen, Germany;1. CEA Saclay (DEN-DANS-DM2S-STMF-LIEFT), 91191 Gif-Sur-Yvette Cedex, France;2. LIMSI-CNRS, UPR 3251, Université Paris-Saclay, 91405 Orsay Cedex, France;3. Sorbonne Université, UFR 919 Ingénierie, 75005, Paris, France;1. Department of Civil and Industrial Engineering (DICI), University of Pisa, Largo Lucio Lazzarino, 2, 56122 Pisa Italy;2. President & CEO, A.V.Tchouvelev & Associates Inc., 6591 Spinnaker Circle, Mississauga, Ontario L5W 1R2 Canada;3. Head of Hydrogen Group, IKET, Karlsruhe Institute of Technology KIT (Germany), von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;4. Head of Centre for Energy and Major Hazards Health and Safety Executive, Harpur Hill, Buxton, Derbyshire, SK179JN UK;1. Containment Systems for Dangerous Goods, BAM, Unter den Eichen 44-46, 12203 Berlin, Germany;2. H2 Mobility Deutschland GmbH & Co.KG, EUREF-Campus 10-11, 10829 Berlin, Germany;1. Gexcon, Fantoftvegen 38, 5072, Bergen, Norway;2. Impetus Afea, Strandgaten 32, 4400, Flekkefjord, Norway |
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| Abstract: | The paper present the work on PIV-measurements of reactant flow velocity in front of propagating flames in hydrogen-air explosions. The experiments was performed with hydrogen-air mixture at atmospheric pressure and room temperature. The experimental rig was a square channel with 45 × 20 mm2 cross section, 300 mm long with a single cylindrical obstacle of blockage ratio 1/3. The equipment used for the PIV-measurements was a Firefly diode laser from Oxford lasers, Photron SA-Z high-speed camera and a particle seeder producing 1 μm droplets of water. The gas concentrations used in the experiments was 14 and 17 vol% hydrogen in air. The resulting explosion can be characterized as slow since the maximum flow velocity of the reactants was 13 m/s in the 14% mixture and 23 m/s in the 17% mixture. The maximum flow velocities was measured during the flame-vortex interaction and at two obstacle diameters behind the obstacle. The flame-vortex interaction contributed to the flame acceleration by increasing the overall reaction rate and the flow velocity. The flame area as a function of position is the same for both concentrations as the flame passes the obstacle. |
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| Keywords: | PIV Explosion Flame-obstacle interaction |
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