Study of the structure of a ten-atmosphere H$_2$–О$_2$–Ar flame using molecular-beam inlet mass-spectrometrometric probing

The structure of a stabilized flame of an argon-diluted, stoichiometric hydrogen-oxygen-argon mixture at pressures of 1 and 10 atm was studied experimentally. Concentration profiles of stable species and flame-front temperature were obtained. At $p$ = 10 atm, the width of the chemical-reaction zone is 0.7 mm and is weakly dependent on flow rate. Comparison with the available models of hydrogen combustion and the data obtained at $p$ = 1atm indicates that extrapolation of the mechanism and rate constants of chemical reactions from a low-pressure region to a higher-pressure region is not justified.