短時間放電火花の点火過程における火炎核の生長機構と火花電極形状の影響

概要

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The formation and growth process of flame kernels in the ignition process by short-duration electric sparks has been investigated by using a numerical simulation and schlieren photographic observations. In the simulation, unsteady two-dimensional cylindrical coordinate system was employed and the governing partial differential equations, such as mass, momentum and energy equations were solved by the finite differential method. The calculated results show that the ellipsoidal hot gas kernel produced by a spark discharge develops into a torus and that there are two high-temperature regions, namely within the rings of torus and just between the spark electrodes. It is also found that a narrow groove is formed inside the torus. These calculated features of the hot kernel structures agree with those in schlieren photographs taken by the high speed camera. Effects of diameter of spark electrodes and shaped of electrode tips on the formation process of flame kernels are also studied.
1989-03-25