A simplified thermodynamically-consistent single-step mechanism for hydrogen combustion

Effective combustion modeling relies on the precise estimation of hydrogen–air combustion characteristics. In this sense, Millán-Merino and Boivin (2024) designed a single-step mechanism for hydrogen combustion that accurately recovers the adiabatic flame temperature using a variable stoichiometric coefficient formalism. The present study proposes a drastic simplification of this approach (further reducing computational cost and complexity) and formally clarifies the contribution of the variable stoichiometric coefficients and their evolution across the flame internal structure. • The variable stoichiometric coefficient formalism introduced in [1] is simplified. • The validity range of this formalism is now established. • The role of the dissociation reaction across the flame front is formalized. • Computational time and stiffness are reduced with higher-order approximation.