巻号一覧
38 巻 (1988)
- 2 号 p. 29-
- 1 号 p. 1-
38 巻, 2 号
選択された号の論文の3件中1～3を表示しています
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論文
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長谷見 雄二, 西畑 三鶴1989 年 38 巻 2 号 p. 29-34
発行日: 1989年
公開日: 2012/02/27
ジャーナル フリーMeasurements of flame height and temperature distribution above fuel surface were made on rectangular propane burners in a huge calm enclosure. Flame height is represented as a function of Q*mod = Q/ρoCpTog1/2A3/2B, where A and B are the length of the shorter and longer side of the upper surface of a burning object respectively. Vertical distribution of temperature above the center of a fuel is compared with temperature profiles for square fuels and for line fuels. Finally a practical criterion for the approximation of rectangular fuels by square and line source is proposed.抄録全体を表示PDF形式でダウンロード (438K) -
守川 時生, 箭内 英治, 渡辺 貞一, 岡田 健夫, 佐藤 喜宣1989 年 38 巻 2 号 p. 35-45
発行日: 1989年
公開日: 2012/02/27
ジャーナル フリーFire tests were conducted in one of the first floor rooms of a fire resistant 2-story house to investigate the evolution of toxic gases and the toxicity of atmosphere in its 2nd floor room. Natural polymer contents only or both synthetic and natural polymer contents were combusted repeatedly in the burn room under the different opening conditions.
Major toxicants were found to be CO and HCN. HCN evolution was greater from the fires involving synthetic polymers, although the same amount of nitrogen-containing materials were contained in both types of contents, Generally, the total toxicity index, Σ(Ci/Cfi), was higher for fires involving synthetic materials as much as the difference in toxicity index of HCN between the fires of the two types of contents. In the 2nd floor room, toxic gases concentrations began to rise about 1 minute after flashover in the burn room, and were faster to rise as the opening facing outdoor of the burn room was smaller. The analyses of the blood of rabbits which died or incapacitated after exposed to the 2nd floor room gases showed that CO-Hb levels were higher for fires of natural polymers than fires involving synthetic polymers. This indicates that greater evolution of HCN in the latter fires contributed to death or incapacitation of rabbits to some extent. A comparison between the total toxicity index and the lethal temperature has revealed that death due to gas poisoning is greater than death due to heat in the 2nd floor room.抄録全体を表示PDF形式でダウンロード (768K) -
武野 計二, 平野 敏右1989 年 38 巻 2 号 p. 47-52
発行日: 1989年
公開日: 2012/02/27
ジャーナル フリーWhen a liquid combustible is accidentally spilled, it will soak into the soil or a porous material such as a mat or carpet on the floor. In order to investigate characteristics of the fire in such a case, a series of studies has been performed of the flame spread over solid-liquid combustible mixtures. The present experimental study is a part of the series and concerns flame spread over a layer of glass beads soaked with a decane-hexane mixture. The objective of the present study is to elucidate the effect of a volatile component on the flame spread phenomena.
The flame spread experiments were carried out using a steel tray of 60 cm long, 3.5 cm wide, and 4.0 cm deep, filled with glass beads and decane-hexane mixture. Ignition was performed by using five cotton wicks set near one end of the tray in a row parallel to the end brim. The temperature and hexane-concentration distributions in the solid-liquid layer were measured respectively with five 0.05-mm-diam. Pt/Pt-Rh13% thermocouples and five sampling micro-probes connecting to a gas analyzer.
Under the conditions of the present experimental study, the flame spread rate was shown to be a several cm/min even if the flash temperature (measured by a closed-cup method) of the combustible liquid mixture before soaked was below the room temperature. This is attributable to the reduction of the hexane concentration just below the layer surface due to the slow diffusion of hexane in the layer. In the vicinity of the leading flame edge, the hexane concentration just below the layer surface was found to increase. This increase of hexane concentration is inferred to be caused by the diffusion rate increase of hexane with the layer temperature. The hexane concentration in the layer below the leading flame edge depends on the diffusion transfer in the layer, and the diffusion rate is closely related to the layer temperature. Consequently, the flame spread rate depends strongly on the heat transfer in the layer even if the combustible mixture includes a certain amount of hexane, a volatile component.抄録全体を表示PDF形式でダウンロード (509K)
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