On High Temperature Oxidation of Chromium: I . Oxidation of Annealed, Thermally Etched Chromium at 800°–1100°C

Abstract

Shock tube measurements of ignition delay times of propeneoxygenargon mixtures are presented. The concentrations are varied from 0.6 to 1.6% propene and from 2.7 to 14.4% oxygen diluted in argon. Temperatures in the range of 1274-1840K are achieved with averaged initial pressures ranging from 50 to 133 Torr. The product distribution is analyzed using a gas chromatograph. The overall ignition delay correlation equation, deduced from over 100 experiments, is given by τ=5.3 x 10-14 exp( 137,500 RT) [C3H6]0.23[O2]-1.12 [Ar]0 s. The reaction mechanism for propeneoxygenargon mixtures is investigated numerically and the results compared to the experimental data. The numerical calculations are performed with two integration techniques, LSODE and CHEMEQ, converging on a kinetic scheme that includes 59 reactions and 29 species. The agreement between the experimental data and the numerical predictions is partial, suggesting that the reaction mechanism is not complete. © 1985.