ABSTRACT
Fig. 19.2. The calculated pressure dependence of the combustion rate for the parallel reactions. The designations are the same as in Fig. 19.1.
The combustion temperature decreases with the pressure growth at q < 1, increases at q > 1, and remains constant at q = 1. The combustion rate at q = 1 monotonically increases and the pressure coefficient increases from 0 to 0.5, which corresponds to the transition of the combustion mode from the reaction of the zero order in pressure to the reaction of the first order. In the case of q > 1, the combustion rate increases and the n value passes through a maximum, which exceeds the n value o f each of the reactions. The smaller the E]-E2 value, the larger this overshoot. In the case of q < 1, the
300 Combustion of Pure Substances: Reactions in the Gas Phase
dependences under consideration can have a minimum. The larger E\—E2 value, the deeper this minimum for the n value. This is caused by the competition o f two factors such as the thermal (Q, Tb) and the kinetic (W oc P) ones, which can act in one or in opposite directions.
