Communications

Thermal ignition of a stoichiometric mixture of hydrogen and oxygen over nanoporous Ni, Co and Fe surfaces near the second ignition limit

N. M. Rubtsov^ab, V. I. Chernysh^a, G. I. Tsvetkov^a, K. Ya. Troshin<sup>c

a</sup> A. G. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation
^b Joint Institute for High Temperatures, Russian Academy of Sciences, 125412 Moscow, Russian Federation
^c N. N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russian Federation

Abstract: The phenomenon indicated in the title was qualitatively investigated using the approximate theory of flame propagation velocity. It was concluded that the equation of the second ignition limit for a spatially homogeneous problem is also qualitatively valid for inhomogeneous ignition, which is the occurrence of a local active ignition center on the most chemically active site of the surface and the subsequent propagation of flame from this center.

Keywords: self-ignition, local, primary center, second ignition limit, Navier–Stokes equations, approximate theory of flame propagation, color speed cinematography.

Received: 04.07.2025
Accepted: 11.09.2025

Language: English

DOI: 10.71267/mencom.7867