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The ignition characteristics of single spark and repetitive sparks into a quiescent propane-air premixed combustible gas was investigated by using a capacitor discharge ignitor and a high voltage pulse generator, with the visualization of single shot schlieren photography. The results clearly demonstrate that the ignition limit of repetitive sparks is much wider than that of single spark and the ignition ability of repetitive sparks is superior to that of single spark. It is also shown that there exists a certain optimum spark delay time interval in the case of repetitive sparks.

Unsteady laminar flame propagation confined in a closed cylindrical combustion bomb is studied by numerical computation for an axisymmetric two-dimensional laminar flame. Computation includes complete two-dimensional unsteady Navier-Stokes equations of change for a chemically reacting propane-air mixture. Implicit Continuous fluid Eulerian, Arbitrary Lagrangian Eulerian finite difference technique, simplified reaction kinetics models, and artificial flame stretching transformation and inverse transformation were adopted in the calculation. Physically realistic flame behavior can be demonstrated even with rather coarse computing cell size, simplified reaction kinetics models, and personal computer level low power computing machines.