Flame inertia into lean region in stratified hydrogen mixture |
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| Affiliation: | 1. Normandie Université, COBRA, UMR 6014 et FR 3038, Université de Rouen, INSA de Rouen, CNRS, IRCOF, 1 rue Tesnière, 76821 Mont Saint Aignan Cedex, France;2. IFREMER, Laboratoire Phycotoxines, F-44311 Nantes 03, France;3. DGA Maîtrise NRBC, département Analyse Chimique, F-91710 Vert Le Petit, France;1. GMV Aerospace and Defence S.A., Tres Cantos (Madrid), Spain;2. LIR - Infrared Laboratory, Departamento de Física, Universidad Carlos III, Leganés (Madrid), Spain;1. Laboratory of Applied Thermodynamics, Department of Mechanical Engineering and Aeronautics, University of Patras, Patras 26500, Greece;2. Laboratory of Signal Processing and Communications, Department of Computer Engineering and Informatics, University of Patras, Patras 26504, Greece;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, PR China;2. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, PR China;3. College of Vehicle Engineering, Chongqing University of Technology, Chongqing 400054, PR China |
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| Abstract: | In hydrogen engines, the direct-injection stratified charge system has the ability to realize a more lean operation than homogeneous charge systems. Flame propagation into the lean region in the stratified hydrogen mixture was investigated in this study. Hydrogen was injected into a lean hydrogen–air premixed mixture charge of the equivalence ratio of 0.074–0.257. This stratified hydrogen mixture was ignited by an electric spark. The flame generated in the hydrogen jet propagated into the lean premixed mixture charge as if it had “inertia”, even though the stoichiometry of the premixed mixture charge was less than the lower flammability limit. The amount of burned hydrogen in the case of a stratified mixture was greater than that in the case of the homogeneous mixture. The flame seems to be supported from behind by the burned gas in the rich region until the decay of this support. |
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