The inhibition and promotion of isothermal NCl_3 flame by NOCl and H_2, respectively, are explained. The crossover form the isothermal mode of flame propagation to the thermal one is analyzed for NCl_3-He mixtures. Calculations based on a kinetic mechanism taking into account energy chain branching are Performed, and qualitative agreement between the calculated and observed data is demonstrated. The one- Dimensional problem of chain-thermal flame propagation by a chain reaction involving a nonlinear-branching Step has two solutions corresponding, one corresponding the isothermal mode of flame propagation and the Other corresponding to the chain-thermal one. Nonlinear chain branching shortens the time needed for thermal Ignition and increases the flammability of the combustible mixture.
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