| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
A vortex ring has a possibility to deliver an extinguishing gas more effectively and over a longer distance than a jet flow which is used to release an extinguishing agent from extinguishing equipment to fire sites. We have examined experimentally the extinguishing method with a vortex ring generated by a premixed combustion. When the premixed combustion is performed under the stoichiometric condition, the combusted gas does not include oxidizer and is considered as an inert gas mixture. The extinguishing experiments of a methane-air jet diffusion flame have been carried out. From the experimental results, it is found that the combusted-gas vortex ring formed at an equivalence ratio of 1.05 shows the largest extinguishing range, which is fifteen times larger than the inner diameter of the premixed combustion tube. The extinguishing tendency of the combusted gas vortex ring clearly depends on the magnitude of a burning velocity of a methane-air premixed flame.
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