Analysis of sprinkler performance in a methanol pool fire using computational fluid dynamics
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The pool fire process and sprinkler action against fires caused by liquid methanol leaks in the fuel preparation room of the ship was simulated using Pyrosim software to evaluate the reliability of sprinklers for fire suppression and extinguishment. The sprinkler performance was assessed by assuming spray velocity and droplet size as variables, and the simulation was performed by changing the spray height under the appropriate derived conditions. In this simulation, the highest fire suppression performance was observed with the smallest droplet size (100 μm) and lowest spray velocity (5 m/s) in the case of the assumed small scale fire. Under these conditions, complete fire extinguishment was achieved only at the lowest sprinkler installation height (3 m) when the temperature was less than the flash point of 11 ℃. In addition, a corresponding spray velocity was required to follow the set spray angle of the sprinkler. Based on these results, it can be concluded that the installation height, droplet size, injection angle, and corresponding spray velocity must be considered in the design of an appropriate sprinkler for suppressing small-scale methanol pool fires in a methanol-fueled ships.
Abstract
The pool fire process and sprinkler action against fires caused by liquid methanol leaks in the fuel preparation room of the ship was simulated using Pyrosim software to evaluate the reliability of sprinklers for fire suppression and extinguishment. The sprinkler performance was assessed by assuming spray velocity and droplet size as variables, and the simulation was performed by changing the spray height under the appropriate derived conditions. In this simulation, the highest fire suppression performance was observed with the smallest droplet size (100 μm) and lowest spray velocity (5 m/s) in the case of the assumed small scale fire. Under these conditions, complete fire extinguishment was achieved only at the lowest sprinkler installation height (3 m) when the temperature was less than the flash point of 11 ℃. In addition, a corresponding spray velocity was required to follow the set spray angle of the sprinkler. Based on these results, it can be concluded that the installation height, droplet size, injection angle, and corresponding spray velocity must be considered in the design of an appropriate sprinkler for suppressing small-scale methanol pool fires in a methanol-fueled ships.
참고문헌 (22)
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