| Budget Amount *help |
¥18,980,000 (Direct Cost: ¥14,600,000、Indirect Cost: ¥4,380,000)
Fiscal Year 2014: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2013: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥11,960,000 (Direct Cost: ¥9,200,000、Indirect Cost: ¥2,760,000)
|
|---|
| Outline of Final Research Achievements |
To achieve the goal of this study, improving the accuracy of damage estimation of an accidental gas explosion, experiments and theoretical analyses are conducted to develop a method to easily measure the flame fractal dimension. The experimental apparatus consists of two concentric cylinders, and a 1-D flame propagates within the narrow gap between them. The fractal dimension can be obtained from the scale dependence of flame propagation velocity. Since the volume of combustible gas used in the apparatus is limited by the narrow gap, the proposed method is safer and simpler than conventional large-scale experiment. Theoretical analyses indicates that the fractal dimension depends mainly on the volume expansion ratio due to combustion; a method is then developed to estimate the fractal dimension from the expansion ratio. It is expected that the risk assessment of an accidental gas explosion can be done more easily and accurately by utilizing the results obtained in this study.
|
