D335 ウォーターミストによるダウンバーストと消炎に対する効果

概要

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The water mist suppression system has advantages on less water damage than the sprinkler system and safety as extinguisher. In past studies, there is no approach to make use of the downburst induced by the water mist. We study this effect numerically based on the previous study on downburst phenomena. Initially, the water mist, which has a fixed but a radius, number density, is distributed uniformly in a cylindrical column at height above a high temperature region. The subsequent phenomena are divided into three stages. The downburst is induced in the first stage. In the second stage, this downward flow collides with the thermal plume and secondary downburst is induced by the interaction between the two flows. The downburst reaches ground and diffuse outward in third stage. The same parameter σ as found in the previous study dominates the strength of downburst. So, the effect of downburst for fire suppression is also understood using the parameter σ.
日本流体力学会の論文
2001-07-31