Dynamics and Energy of Combustion of Ultra-Lean Mixtures of Hydrogen with Air in a Limited Volume

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In this paper, the combustion dynamics inside a closed volume filled with pre-mixed hydrogen-air mixtures with a composition close to the lower flammability limit is investigated based on a detailed numerical analysis. A comparison of flame evolution features is made depending on the initiation mechanism: a point ignition source or continuous heat supply from a heated region on the reactor wall. It is shown that with point ignition, the completeness of hydrogen combustion is significantly lower than with heat supply from the wall. It is also found that, despite the low chemical activity of ultra-lean hydrogen-air mixtures, the combustion process has a positive balance between the energy release during chemical reactions and the heat supplied to the reactor from the heated wall.

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I. Yakovenko

Joint Institute for High Temperatures of the Russian Academy of Sciences

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Email: yakovenko.ivan@bk.ru
俄罗斯联邦, Moscow

A. Kiverin

Joint Institute for High Temperatures of the Russian Academy of Sciences

Email: yakovenko.ivan@bk.ru
俄罗斯联邦, Moscow

K. Melnikova

Joint Institute for High Temperatures of the Russian Academy of Sciences

Email: yakovenko.ivan@bk.ru
俄罗斯联邦, Moscow

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2. Fig. 1. Problem formulation: a - variant of ignition from a point source; b - variant of ignition from a hot spot on the lower end of the chamber.

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3. Fig. 2. Chronology of the evolution of the combustion centre in a 6% hydrogen-air mixture initiated by a point source at times 20 (a), 60 (b), 100 (c), 140 (d), 180 (e) and 220 ms (f).

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4. Fig. 3. Chronology of the evolution of the combustion centre in a mixture of 6% hydrogen with air initiated by a heated surface at Rspot = 3.2 mm, Tspot = 2000 K at times 20 (a), 60 (b), 100 (c), 140 (d), 180 (e) and 220 ms (f).

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5. Fig. 4. a - Time dependence of the ratio of the current hydrogen mass m(H2) in the reactor to the initial hydrogen mass m0(H2) in per cent. Thin dashed lines - linear interpolation at the stage of cone-shaped flame; b - graphs of change of energy release due to chemical reactions, Er, and heat absorption, Ec, due to conductive heat exchange with reactor walls.

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