Extingushiment by the Colling Effect of the Fuel Surface with Pool Fires

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Journal of Korean Institute of Fire Science and Engineering 1997;11(4):15-23.
Published online December 31, 1997.

Pool 화재에서의 표면 냉각에 의한 소화

한용식김명배신현동

¹한국기계연구원 산업설비 연구부²한국기계연구원 산업설비 연구원³한국과학기술원 기계공하과

Extingushiment by the Colling Effect of the Fuel Surface with Pool Fires

Abstract

A series of measurements and visualization to investigate the extingushiment of water sprays with pool fires is presented. Fire source is a small-scale pool burner with methanol, ethanol and gasoline. Measurements of temperature, O2, CO2, and CO concentrations along the plume centerline are carried out to observe pool structures without water sprays. Visualization by the Ar-ion laser sheet flow pattern of droplets of the sprays above the pool fires. It is observed than in the case of methanol and ethanol, water sprays continuously penetrate into the center of fuel surfaces. The gasoline pool fire allows intermittent penetration of water sprays because of pulsating characteristics of the gasoline flame. To evaluate the cooling effect of the fuel surface by the sprays, the temperature was measured at the fuel surface. As soon as the mists reach the fuel surface of methanol and ethanol, the temperatures of the fuel surface decrease rapidly below the boiling point, and then the fires are extinguished. Due to the application of mist upon the gasoline fire, though the fuel temperature decrease abruptly at the time of the injection, such a repid decrease do not continue till the extinction point.

Key Words: Interaction, Pool Fires, Water Sprays, Extinguishment, Penetration