Measurement of the rate coefficient of H+O2+MHO2+M for M = Ar and N2 at high pressures
Academic Article
Overview
Research
Identity
Additional Document Info
Other
View All
Overview
abstract
OH mole fraction profiles were measured using cw UV laser absorption in shock-heated mixtures of H2/O2/Ar/N2 between 1260 and 1375 K at 50, 68, and 115 atm. Rate coefficients for the reaction H+O2+MHO2+M, M=Ar and N2 were inferred by comparison of measured OH profiles with OH profiles modeled using the GRI-Mech v1.2 mechanism. The rate coefficient data were fit with pressure-dependent expressions that use k and Fcent from Cobos et al. [3]. For M=Ar, the measured third-order rate coefficients are consistent with a pressure-dependent expression that uses k0=71017T-0.8 [cm6/mol2/s] from GRI-Mech v1.2. For M=N2, the present data, when combined with the lower-temperature value of Bromly et al. [15], are consistent with a pressure-dependent expression that uses k0=2.61019T-1.24 [cm6/mol2/s] over the temperature range of 700-1375 K. This expression yields k0 values that are substantially higher than the GRI-Mech v1.2 recommendation but consistent with previous flow reactor, flame, and shock tube data and the review of Baulch et al. [24]. 1996 Combustion Institute.