Ignition transient

Fig. 13.1 Ignition transient process by conductive, convective, and radiative heat.

Fig. 17.15 The top panel shows the transient surface-state composition during catalytic ignition on a long time scale. The lower panel shows the transient response of the Stefan velocity and the pressure-curvature eigenvalue on a very short time scale during the ignition transient. The zero point for the abscissa scales is arbitrary.

The sequence of definite partial equilibrium compositions which would describe a hydrogen-oxygen reaction mixture at successive values of N in the limiting circumstance of infinitesimally slow decrease in N provide us a very useful approximate description of the trajectory of the composition under the finite but rate-limiting influence of the actual association reactions at low to moderate reaction system pressures, once the ignition transient has abated and the several partial equilibrium relationships have become approached. 

---