| Project/Area Number |
11650230
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | Hirosaki University |
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Principal Investigator |
ITO Akihiko Hirosaki University, Department of Intelligent Machines and System Engineering, Professor, 理工学部, 教授 (30127972)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Fire Research / Fire Fighting / Water Bubble / Inert Gases / Halon Replacement / Extinction / Flame-extinguish concentration |
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| Research Abstract |
It is of urgent necessity to develop a new fire fighting system instead of Halon gases. According to our previous result isolating an air flow into the base flame is quite useful to extinct a fire. In this research, a new fire fighting technique by water bubble lorded with inert gases is proposed. The bubble is carrier to concentrate the inert gas into flame base. Fire extinction tests were performed for four gases of nitrogen, carbon dioxide, inergen gas and air with various gas and water flow rates. The following conclusions are deduced. 1) The minimum extinction time is exist for combination of gas flow rate and water flow rate. 2) Carbon dioxide is more effective for fire suppression. 3) The flame-extinguishing concentration of carbon dioxide is about 24% in this test, while it decreases 2〜5% by the bubble loaded with carbon dioxide. 4) The inert gas flows into the flame front with the velocity of 0.3〜0.5 m/s by break down the bubble near the flame front. Our new method is possible to increase the safety for a human body in fire conditions by reduce the flame-extinguish concentration of inert gas.
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