2유체노즐을 이용한 헵탄 풀화재 소화에 대한 실험적 연구

Abstract

In the present experimental study, the spray characteristics and the liquid pool fire extinguishing performance of twin-fluid nozzle using the air and water were investigated. As the spray characteristics, the spray distribution, droplet size, and downward velocity and volume flow rate distributions of air were measured with the inlet pressures of air and water flows. For the liquid pool fire extinguishing experiment, the heptane (n-heptane) was used as the fuel and three kinds of fuel source diameter (80, 120, and 160 mm) were tested. As increase in the fuel source diameter, both of burning rate and heat release rate increased. Through a series of fire extinguishment experiments, the extinguishment map, extinguishment time, and estimated water consumption were provided and discussed. In the higher air flow rate and smaller fuel source diameter conditions, the heptane pool fire put out easier, and the extinguishment time and estimated water consumption were observed to be short and small, respectively. In addition, the effect of water mist on the burning rate was examined. The burning rate increased with increasing the air flow rate, which might be due to the mixing enhanced by the water mist.