Researches on Characteristics of Plural Air Shutters for Prevention of Fire

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  • 複数の防火エア・シャッタのしゃ断特性について
  • フクスウ ノ ボウカ エア シャッタ ノ シャダン トクセイ ニ ツイテ

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In order to prevent the diffusion of smoke from a fire point at the beginning of a fire as well as to let people refuge easily toward safety zones, air shutters combined with the push and pull flow have been suggested and investigated as a means of prevention of fire. <br>In practical fire, if the air shutter is broken with the increase of the velocity of smoke, safety zones change into danger ones. However, if there are a lot of air shutters installed at the passageway along with the expansile direction of fire and smoke, it can be considered that they ensure sufficient time while people can refuge. So far, the flow characteristics concerning plural air shutters installed with a separated constant distance at the passageway have not been enough investigated. <br>From the above point of view, the important subject how plural air shutters are suitably installed for the prevention of fire is investigated. In this paper, internal pressure between air shutter ‘A’ and ‘B’ as well as the close correlation between the ratio of side flow velocity and the ratio of push-pull flow volume are discussed, according to the variation of air shutter sizes, side flow velocity and push-pull flow volume. Furthermore, the basic data of air shutters required for practical designs are derived from the results of experimental researches. <br>As a conclusion of this investigation, it is clearly found that plural air shutters installed at the passageway so as to let people refuge easily from the danger zone are very effective in excluding smoke at the beginning of a fire.

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