| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
In this study, it was attempted to clarify the structure and mechanism of a fire tornado from a viewpoint of vortex dynamics. The method of computational fluid dynamics (CFD) was used. As a result, the double structure consisting of inner helical vortex line and outer helical vortex line was found in the fire tornado, and the high-speed upward flow of combustion gas was also found in a gap region between the inner and outer helical vortex lines. This double structure of helical vortex lines and its induction flow velocity enabled the high-speed transport of combustion gas from the ground to the sky, keeping the combustion gas in the tornado-like slender cylindrical region. Therefore, the structure and mechanism found in this study seemed to be essentially important for the formation and sustainment of the fire tornado.
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