| Project/Area Number |
61850079
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶構造・建造
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| Research Institution | Kyshu university |
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Principal Investigator |
FUKUCHI Nobuyoshi Kyushu University,Faculty of Engg., Professor, 工学部, 教授 (80039677)
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| Co-Investigator(Kenkyū-buntansha) |
KOBAYASHI Yoshihiro Mitsubishi Heavy Industry, Nagasaki Shipyard,.Chief, 長崎造船所・造船設計部, 主務
永野 裕康 九州大学, 工学部, 助手 (90037862)
YASUZAWA Yukitaka Kyushu University, Faculty of Engg., Associate Professor, 工学部, 助教授 (10191123)
HASHIMOTO Takeshi Hiroshima University,Faculty of Engg., Associate Professor, 工学部, 助教授 (30034317)
TSUJI Isamu Kyushu University, Faculty of Engg.,Professor, 工学部, 教授 (80037697)
NAGANO Yasuhiro Kyushu University, Faculty of Engg., Research Associate
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1987: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1986: ¥5,700,000 (Direct Cost: ¥5,700,000)
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| Keywords | Heat Generation by oxidation / Spontaneous Combustion / Arrheniusee'type / Effective Conductivity / Numerical Analysis of Temperature / Visualized Experiment / Penetrated Zone to particle Size / 隔壁の弾塑性大たわみ / 石炭の酸化発熱と自然発火 / 酸素濃度の拡散方程式 / エンタロピー関数による温度の数値計算 / 熱放散と蓄熱量 / 浸透流可視化実験 / 注水による冷却 |
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| Research Abstract |
The heat generation of stored coal by oxidation and the heat accumulation in cargo hold were investigated by the experiment using the octagon-sectioned hold model on the scale of one-thirtieth and the numerical analysis of heat diffusion of packed particles. As the results, the relation between the decisive factors governing the heat accumulation and the variation of hold temperature attended the change of oxyzen concentration as time proceeds are clarified. The decisive factors for heat accumulation are found as following prior order; (1) apparent activation energy and frequency factor of coal,(2)size of cargo hold, (3) effective heat coductivity of particles,(4)heat transmission through hold surrounding.
In the case of cooling down over-heated cargo holds by pouring water, it is necessary to hav eknowledge of unsteady seepage flow through packed coal for efficient extinguishing. The experiment of visualization by use of quasi-dimen- sional hold model for water-penetration in particles was carried out and the variation of penetrated zone.and area of seepage as time proceeds were investigated according to the size of particles.
Furthermore, in order to study the ultimate strength of hold structure consid- ering over-loading condition by pouring water,a simplified elasto-plastic analysis of stiffened plate was introduced and applied to estimate the strength of bulkhead.
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