Abstract
The generalized, spherically symmetrical, unsteady, nondimensional, simultaneous equations describing the thermal ignition process by a spherical pocket of hot gas in the homogeneous combustible gaseous mixture have been analyzed by numerical computation. There are five independent concentration equations describing the behaviours of five species during chemical reaction. Variable thermal properties of different species at different temperatures were used during computation. The effect of equivalence ratio of the critical diameter of burned gas pocket has been investigated. The spherically symmetrical, unsteady governing equations for ignition in combustible gas by an electric spark have been solved numerically. A generalized spark discharge term is used in the energy equation, and the discharge diameter is equal to the critical diameter of the burned gas sphere. The effect of equivalence ratio on the minimum ignition energy has been investigated numerically and the optimum equivalence ratio is in agreement with experimental data of other authors. The influence of the reaction orders with respect to oxygen and fuel on the ignition performance has also been analyzed. The relationship between oxygen concentration and critical ignition pressure were obtained.
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