Mechanism Clarification of a Fire Tornado Occurring in Great Earthquake Disaster from a Viewpoint of Vortex Dynamics
| Project/Area Number |
25560177
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Natural disaster / Disaster prevention science
|
|---|
| Research Institution | Yamagata University |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| 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)
|
|---|
| Keywords | 火災旋風 / 渦・旋回流 / 重力・浮力 / 燃焼 / ラセン状の渦線 / 渦力学 / 数値シミュレーション / 防災・安全 / ラセン状渦線 / CFD / 防災安全 / 渦 / 重力 |
|---|
| 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.
|
Report
(4 results)
Research Products
(12 results)
