Archive | 2019
Shock tube study of the rate constants for H + O2 + M → HO2 + M (M = Ar, H2O, CO2, N2) at elevated pressures
Abstract
Abstract The rate constants for the reaction H\u202f+\u202fO 2 +\u202fM→HO 2 +\u202fM were investigated at elevated pressures from 12 to 33\xa0atm using ignition delay time (IDT) measurements behind reflected shock waves in H 2 /O 2 /M mixtures with different collision partners M\u202f=\u202fAr, H 2 O, N 2 and CO 2 . The temperature and pressure ranges where the rate constants of the reactions H\u202f+\u202fO 2 +\u202fM→HO 2 +\u202fM and H\u202f+\u202fO 2 -\u202f>\u202fOH\u202f+\u202fO dominate the IDT sensitivity were selected as optimum test conditions using the detailed H 2 /O 2 mechanism of Hong et al. (2011). The current study thus provides a quantitative and relatively direct method for determining the rate constants for H\u202f+\u202fO 2 +\u202fM→HO 2 +\u202fM using simple IDT measurements. The rate constants found are consistent with earlier studies, but with reduced uncertainties.