미분무 분사 방향과 간격이 열복사 감쇠에 미치는 영향에 관한 전산시뮬레이션

Abstract

In this study, the numerical simulations on the effects of water mist discharge direction and spacing on the water mist characteristics and thermal radiation attenuation were performed using FDS (fire dynamics simulator). To evaluate the accuracy of the numerical simulations, the experimental results of the heat flux measurements and the previous study were compared with the present numerical simulation results. Then, the numerical simulations were conducted under different water mist discharge direction and spacing conditions. For the effect of water mist discharge direction, the case of the upward direction showed wider spray width, higher particle concentration, and higher thermal radiation attenuation rate than the case of the downward direction. For the effect of water mist discharge spacing, the droplet size and particle concentration distributions between the downward and upward directions of water mist discharge were observed to be clearly different. In addition, the case of the upward direction of water mist discharge showed a greater increase in the thermal radiation attenuation rate with increasing water mist discharge spacing, as compared with the case of its downward direction.