Chain-thermal propagation of flame communication 2. effect of pressure and temperature

Summary

• 1. A relation was obtained for the pressure and temperature dependences of the flame propagation velocity from which it follows that the rate with which the flame propagation velocity changes with pressure depends on the composition of the fuel mixture and its calorific value, as well as on the initial temperature. In mixtures with high calorific value the flame propagation velocity may be independent of pressure.

• 2. The theoretical pressure dependences of the flame propagation velocity for a stoichiometric methaneair mixture and for ethylene-air mixtures of different compositions calculated by the given relation agree well with experimental data.

• 3. The slope of the graph of the relation of the flame propagation velocity logarithm to the reciprocal combustion temperature depends not only on the activation energy, but also on the heat of formation of the active center. The relation obtained makes it possible to find the true activation energy by analyzing experimental data.