Abstract
Unsteady-state laminar flame theory is used to predict minimum ignition energies for hydrazine vapor and to follow flame speed, temperature profiles, and concentration profiles from ignition by spherical or elongated hot pockets to steady propagation of spherical flames. The time-dependent flame equations are solved in prolate spheroidal coordinates using a Crank-Nicolson predictor-corrector method with step size control. It is shown that the minimum ignition energy is influenced by the geometry of the ignition source and that the ignition energy passes through an absolute minimum as a function of the radius of the spark. Steady flame speeds are compared with experimental values and with the predictions of other workers; and the influence of physical properties, reaction chemistry, and kinetics on the steady flame speed is examined.
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