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Kojima, Wataru; Yamakami, Mitsunori; Fujikawa, Daisuke; Kitagawa, Yoshito*; Hagihara, Takeshi*; Saito, Ryosuke*
Doboku Gakkai Heisei-20-Nendo Zenkoku Taikai Dai-63-Kai Nenji Gakujutsu Koenkai Koen Rombunshu, p.455 - 456, 2008/09
no abstracts in English
Kojima, Wataru; Yamakami, Mitsunori; Fujikawa, Daisuke; Orukawa, Go*; Kitagawa, Yoshito*; Doi, Takashi*; Saito, Ryosuke*
Doboku Gakkai Heisei-20-Nendo Zenkoku Taikai Dai-63-Kai Nenji Gakujutsu Koenkai Koen Rombunshu, p.453 - 454, 2008/09
no abstracts in English
Orukawa, Go; Morioka, Hiroshi; Yamakami, Mitsunori; Murakawa, Shiro*
Denryoku Doboku, (324), p.82 - 86, 2006/07
no abstracts in English
Orukawa, Go; Yamakami, Mitsunori; Funaki, Hironori; Nago, Makito*
no journal, ,
no abstracts in English
Inoue, Masahiro*; Hidaka, Yuki*; Yamakami, Mitsunori; Hatakeyama, Nobuya; Okuzono, Akihiko*; Sakai, Tetsuo*
no journal, ,
A series of experimental study using a scaled model concerning the behavior of ventilation air during a mine fire was carried out. The model consists of two vertical shafts, three horizontal ducts and a exhaust fan. The cross section of the shaft and duct is 0.2m square. The height of the shafts is 3.4m. The length of the ducts is 1.5m. The airflow rate can be adjusted by regulators installed in each duct. The behavior of the fire gas was measured by anemometer, thermometer, and visualized image using laser light. Some amount of fire gas of high temperature rose upward gradually along the shaft wall regardless of the downward ventilation. Then the direction of main ventilation air suddenly reversed upward in the shaft. The direction of ventilation reversed in many places in the model and the fire gas reached even the part not anticipated. It was also found that the direction of ventilation in the shaft reversed upward entirely when the initial velocity of the airflow was small.
Inoue, Masahiro*; Hidaka, Yuki*; Nakaba, Nozomi*; Yamakami, Mitsunori; Hatakeyama, Nobuya; Okuzono, Akihiko*; Sakai, Tetsuo*
no journal, ,
A fire in a deep underground structure has a potential threat that it may result in a big disaster because the ventilation system is fully disturbed and the fire gas spread to unanticipated places by the effect of buoyancy of the fire gas. The result of the study using scaled model experiment and computer simulation on the fire gas movement is described in the report.
