Experiments were performed to seek if the laminar premixed flame could be stabilized at the downstream of a ceramic honeycomb. In previous theoretical studies, a stable flame has been predicted in the downstream region of the combustor, but it has never been observed in experiments. In this study, a stable downstream flame could be obtained for the lower burning velocity through circumferential heating by a blue flame positioned outside the periphery of the specially devised combustor. The existence of the stable downstream flame was confirmed by a direct photography of soot line, and temperature measurements. The effect of combustor size on the flame stability was also investigated. As the diameter of combustor increased, the lean flammability was found to be extended.
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