著者

早坂 洋史 木村 圭司 工藤 純一

出版者

Japan Association for Fire Science and Engineering

雑誌

日本火災学会論文集 (ISSN:05460794)

巻号頁・発行日

vol.55, no.1, pp.1-9, 2005 (Released:2011-03-16)

参考文献数

14

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ロシア極東サハ共和国の森林火災傾向について気象データを基に検討した。最近の焼損面積の増加傾向は,気候変動に伴う気温の上昇,5~9月の降水量の減少,特に,日平均降雨量の半減傾向の影響が原因と思われた。この低降雨量条件下で,2002年に焼損面積約2.3万km2の大規模な森林火災がヤクーツク周辺で発生した。この大火災の経過を,衛星観測と気象計測とのデータを使って詳細に解析し,大火災となった原因について考察した。(オンラインのみ掲載)

著者

工藤 純一 八木 順一郎

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.73, no.15, pp.2020-2027, 1987-11-01 (Released:2010-01-19)

参考文献数

26

被引用文献数

8

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An attempt was made on the simultaneous analysis of the gas flow and heat transfer in the blast furnace by a mathematical model which considered complex structure and nonuniform sink and source terms for both heat and mass. ERGUN'S equation was used for the equation of motion of gas and potential flow approximation was used for the equation of solid flow. Two dimensional distribution for the velocities of gas and solid was obtained numerically by applying the finite element method with quadratic elements. Fundamental equations of heat transfer on gas and solids were composed of the terms for convection, heat exchange and heat source. Numerical computation of the fundamental equations was carried out in accordance with the method of characteristics. In this analysis, sink and source terms regarding fusion of ore in the cohesive zone and combustion of coke in the raceway were incorporated in the mathematical model as well as radial distributions of particle size and void fraction. It was consequently found that the temperature distribution was affected principally by nonuniform gas flow and thermal flow ratio. Within the cohesive zone, strong consumption of heat by fusion of ore and decrease in the solids velocity appeared. These phenomena affected significantly the temperature distribution in the lower region of the blast furnace together with the generation of heat in the raceway region.