A numerical modelling of an influence of CH4, N2, CO2 and steam on a laminar burning velocity of hydrogen in air |
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| Authors: | VV Azatyan Yu N Shebeko AYu Shebeko |
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| Institution: | 1. Institute of Structural Macrokinetics of Russian Academy of Sciences, Chernogolovka, Moscow Region, 142500, Russia;2. All Russian Scientific Research Institute for Fire Protection, VNIIPO 12, Balashiha, Moscow Region, 143900, Russia;1. “I.G. Murgulescu” Institute of Physical Chemistry, Spl. Independentei 202, P.O. Box 12-194 Sector 6, 060021 Bucharest, Romania;2. Faculty of Chemistry, University of Bucharest, Bd.Elisabeta 4-12, 030018 Bucharest, Romania;1. Department of Aerospace Engineering, University of Maryland, College Park, MD 20742, USA;2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230027, PR China;1. Istituto di Ricerche sulla Combustione, Consiglio Nazionale delle Ricerche (CNR), Piazzale Tecchio 80, 80125 Napoli, Italy;2. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzale Tecchio 80, 80125 Napoli, Italy;1. School of Safety Science & Engineering, Xi’an University of Science and Technology, 58, Yanta Mid. Rd., Xi’an, 710054, Shaanxi, PR China;2. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, 58, Yanta Mid. Rd, Xi''an, 710054, Shaanxi, PR China;3. Shaanxi Engineering Research Center for Industrial Process Safety & Emergency Rescue, 58, Yanta Mid. Rd., Xi''an, 710054, Shaanxi, PR China;4. Postdoctoral Program, Xi’an University of Science and Technology, 58, Yanta Mid. Rd., Xi’an, 710054, Shaanxi, PR China;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China;2. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China |
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| Abstract: | The influence of additives of various chemical natures (CH4, N2, CO2, and steam) at a laminar burning velocity Su of hydrogen in air has been studied by numerical modelling of a flat flame propagation in a gaseous mixture. It was found that the additives of methane to hydrogen–air mixtures cause as a rule monotonic reduction in the Su value with the exception of very lean mixtures (fuel equivalence ratio ? = 0.4), for which a dependence of the laminar burning velocity on the additive's concentration has a maximum. In the case of the chemically inert additives (N2, CO2, H2O) the laminar burning velocity of rich near-limit hydrogen–air flames drops monotonically with an increase in the additive's content, but no more than 1.5 times, and the adiabatic flame temperature changes slowly in this case. In the case of methane as the additive, the laminar burning velocity is diminished approximately 5 times with an increase in the adiabatic flame temperature from 1200 to 2100 K. Deviations from the known empirical rule of the approximate constancy of the laminar burning velocity for near-limit flames are shown. |
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