Wall Interactions of Hydrogen Flames Compared with Hydrocarbon Flames

This paper provides a comparison of wall heat fluxes and quenching distances as one-dimensional hydrogen and heptane flames impinge head-on onto a wall. It is shown that the quenching distances for stoichiometric H₂/air and C₇H₁₆/air flames under the specified conditions of this study are about the same, but the wall heat flux for the H₂/air flames is approximately a factor of two greater. For lean H₂/air mixtures, the quenching distance increases substantially and the wall heat flux decreases. To understand more clearly the interplay of flame speed, temperature, thermal diffusivity, and surface kinetics on the results, studies of H₂/O₂ flames are also carried out.