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Ignition of hydrogen-air mixtures under volumetric expansion

Abstract : A better understanding of chemical kinetics under volumetric expansion is important for a number of situations relevant to industrial safety including detonation diffraction and direct initiation, reflected shock-ignition at obstacles, ignition behind a decaying shock, among others. The ignition of stoichiometric hydrogen-air mixtures was studied using 0D numerical simulations with time-dependent specific volume variations. The competition between chemical energy release and expansion-induced cooling was characterized for different cooling rates and mathematical forms describing the shock decay rate. The critical conditions for reaction quenching were systematically determined, and the thermo-chemistry dynamics were analyzed near the critical conditions.
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Submitted on : Tuesday, September 10, 2019 - 10:36:53 AM
Last modification on : Wednesday, November 3, 2021 - 5:55:36 AM

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R. Mével, J. Melguizo-Gavilanes, D. Davidenko. Ignition of hydrogen-air mixtures under volumetric expansion. Proceedings of the Combustion Institute, Elsevier, 2019, 37 (3), pp.3503-3511. ⟨10.1016/j.proci.2018.07.124⟩. ⟨hal-02282608⟩

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