The results of a new experimental programme to measure auto-ignition delay times in mainly lean (/ \ 0.5) propaneÈair mixtures at intermediate temperatures in the range 850 K upwards and pressures 5È40 bar are described. The delays are compared to predictions obtained by the integration of two detailed chemical kinetic reaction schemes. Experimentally, a decrease in activation energy was observed at around 1000 K. The work shows that extrapolation of ignition delays obtained at high temperatures T [ 1000 K can lead to signiÐcant overestimation of the actual delay times at lower temperatures. Despite the introduction of additional key reactions the kinetic schemes used could not fully reproduce the delay times observed experimentally at temperature below ca. 1000 K. Previous studies Ignition delay measurementsPrevious experimental studies of the oxidation and autoignition of propane, as with other hydrocarbons, fall into

We thank the authors of reference 15 for communicating their results before publication.

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Investigation of the kinetics of the abstraction of primary and tertiary hydrogen atoms by chlorine atoms indicates that the presence of an inert gas (hexafluoroethane) has a marginal effect. Improved Arrhenius parameters have been derived for these reactions and parameters found for the fluoroethanes .