Abstract

With reference to flame kernel developments in spark ignition of combustible mixtures, the formation process of hot kernels produced by short duration sparks (less than 0.3 μs) in an inert gas is modeled by using a set of partial differential equations with unsteady and two-dimensional cyclindrical coordinates. These equations are solved numerically. The results show that the gas flow pattern governs the kernel configuration and that the kernel shape has some characterized features such as a torus, a torus with a groove and a nontoroidal shape. The simulated results are successfully verified by optical measurements.

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