Intermittent Flame Structure and Air Entrainment Mechanisms of Small-Scale Pool Fires

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  • 小型プール火災の間欠火炎構造と空気流入機構
  • コガタ プール カサイ ノ カンケツ カエン コウゾウ ト クウキ リュウニュウ キコウ

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Abstract

This paper describes an investigation of pulsating flame structure and air entrainment of n-hexane pool fires. Our objectives are: (1) understanding the mechanism of transition from a pseudo laminar diffusion flame to a pulsating flame and (2) understanding the intermitted flame structure and air entrainment flow pattern in pool fire. To reveal 3-D flow structure we conducted flow visualization by a particle-track laser sheet technique (PTLS) for both vertical and horizontal cross sections. The transient flame shape and flow patterns were presented for eight different pan diameter pool fire (D=11 mm∼D=102 mm). It is found from the measurements a cone shaped stable flame changes to pulsating flame at the l6 mm diameter pan. In intermitted flame zone, the relatively large troidal circulation appears around the neck flame surface which produces the periodic mushroom shaped flame above the neck flame. Convective air entrainment occurs both the bottom and the top of mushroom shaped flame, as a result the total air entrainment remarkably increases. The horizontal cross section of the flame within 30 mm diameter pan is axially symmetric. While over 30 mm diameter pan a few couple of vortex exists around the flame which leads to wrinkled flame. The flow structure around the flame becomes to be 3-D due to the number of vortex motion.

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