Kinetics of Individual Combustion Reactions Over Wide Temperature Ranges, For Army Models

摘要

The kinetics of reactions important for models of nitrate ester and nitramine propellant combustion, as well as a reaction of a potential halon replacement fire retardant, has been studied. The experiments, on isolated elementary reactions, have been made in a high-temperature reactor to yield rate coefficients k(T) in realistic temperature ranges. All k(T) given are in cu cm/ molecule/sec. The N + CO2 right arrow NO + CO reaction has given an upper limit value of 5x10(exp -16) at 1140 K and lower values at lower temperatures. This suggests that the reverse reaction is unimportant in dark zones. This is the first investigation of an N-atom reaction at high temperatures by a photolytic technique. As a check on the method, the N + O2 right arrow NO + O reaction was studied. It yielded k(400-1220 K) = 2.0x10(exp -18) T2.15 exp(-2557 K/T), which in the region of temperature overlap (< 910 K), is indistinguishable from the literature recommendation. The reaction O + N2O has two channels NO + NO and O2 + N2. From the measurements, with subsequent modeling, k(1370-3850 K) = 1. 7x10(exp -10) exp(-14100 K/T) and k(1076-3340 K) = 6.1x10(exp -12) exp(-8000 K/ T), were obtained for the respective channels. The latter is much larger than reviews suggest and will have a major impact on dark zone models. The ongoing work on O + CF3H has yielded the recommendation k(630-1330 K) = 3.3x10(exp -9) exp(-10663 K/T).