Effect of Propane Additives on Laminar Burning Velocity in Hydrogen-Air-Water Steam Mixtures

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Abstract

A numerical simulation was conducted to investigate the laminar flame speed in a stoichiometric mixture of hydrogen, air, and water vapor, with the addition of a small amount of propane, at an initial temperature of 323 K and a pressure of 1 atm. The results demonstrate that even at low concentrations, propane acts as an effective inhibitor of combustion processes in hydrogen mixtures. A sensitivity analysis was performed, identifying the key chemical reactions that influence the formation of the laminar flame speed. Furthermore, application of Le Chatelier’s principle revealed that even minor additions of propane can substantially alter the mixture composition, specifically its overall fuel equivalence ratio, which may also affect the flame speed.

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About the authors

P. N. Krivosheev

Lykov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus

Author for correspondence.
Email: krivosheyev.pavlik@gmail.com
Belarus, Minsk

Yu. S. Kisel

Lykov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus

Email: krivosheyev.pavlik@gmail.com
Belarus, Minsk

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Supplementary files

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2. Fig. 1. Calculated dependence of laminar flame velocity on inhibitor concentration for a stoichiometric mixture of hydrogen with air and water vapour. Initial temperature - 323 K, initial pressure - 1 atm.

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3. Fig. 2. Reaction sensitivity coefficients for a mixture of hydrogen with air and water vapour in the presence of a small amount of propane. Initial temperature - 323 K, initial pressure - 1 atm.

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4. Fig. 3. Calculated concentrations of the main intermediate radicals in the flame of a mixture of hydrogen with air and water vapour in the presence of a small amount of propane. Aramco 1.3 mechanism, initial temperature - 323 K, initial pressure - 1 atm.

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5. Fig. 4. Calculated temperature profiles in the flame of a mixture of hydrogen with air and water vapour as a function of propane concentration. Aramco 1.3 mechanism, initial temperature - 323 K, initial pressure - 1 atm.

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6. Fig. 5. Deflagration limits of C3H8-H2 mixtures with air, calculated by Le Chatelier's rule: 1 - lower concentration limit, 2 - stoichiometric composition, 3 - upper concentration limit.

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