물을 사용한 미분무수의 소화 메커니즘 이외에 포 소화약제의 기포에 의한 유면봉쇄 효과등을 해석하고 미분무수에 포 소화약제를 적용하여 소화효과를 향상시키기 위한 조건등을 고찰하고자 하였다. 또한 주어진 실험조건에서 미분무수 노즐의 분무방식, 분무입자의 크기, 노즐 설치 높이 및 화재실의 개구부 여부등에 따른 각 인자들 간의 상호작용을 유류화재 소화실험과 Mini tab을 이용하여 실험 변수들 간에 미치는 영향과 민감도등을 분석함으로서 미분무수 소화시스템의 최적의 소화모델을 도출하고자 하였다. 그리고 FDS(Fire Dynamic ...
물을 사용한 미분무수의 소화 메커니즘 이외에 포 소화약제의 기포에 의한 유면봉쇄 효과등을 해석하고 미분무수에 포 소화약제를 적용하여 소화효과를 향상시키기 위한 조건등을 고찰하고자 하였다. 또한 주어진 실험조건에서 미분무수 노즐의 분무방식, 분무입자의 크기, 노즐 설치 높이 및 화재실의 개구부 여부등에 따른 각 인자들 간의 상호작용을 유류화재 소화실험과 Mini tab을 이용하여 실험 변수들 간에 미치는 영향과 민감도등을 분석함으로서 미분무수 소화시스템의 최적의 소화모델을 도출하고자 하였다. 그리고 FDS(Fire Dynamic Simulation) 화재시뮬레이션을 이용한 모사결과와 실험결과들의 비교를 근거로 미분무수 소화시스템의 적용에 따른 유류화재의 화염거동 및 소화특성을 고찰하여 다양한 유류화재에 미분무수 적용 조건들을 도출하고자 하였다.
물을 사용한 미분무수의 소화 메커니즘 이외에 포 소화약제의 기포에 의한 유면봉쇄 효과등을 해석하고 미분무수에 포 소화약제를 적용하여 소화효과를 향상시키기 위한 조건등을 고찰하고자 하였다. 또한 주어진 실험조건에서 미분무수 노즐의 분무방식, 분무입자의 크기, 노즐 설치 높이 및 화재실의 개구부 여부등에 따른 각 인자들 간의 상호작용을 유류화재 소화실험과 Mini tab을 이용하여 실험 변수들 간에 미치는 영향과 민감도등을 분석함으로서 미분무수 소화시스템의 최적의 소화모델을 도출하고자 하였다. 그리고 FDS(Fire Dynamic Simulation) 화재시뮬레이션을 이용한 모사결과와 실험결과들의 비교를 근거로 미분무수 소화시스템의 적용에 따른 유류화재의 화염거동 및 소화특성을 고찰하여 다양한 유류화재에 미분무수 적용 조건들을 도출하고자 하였다.
The extinguishing experiment with water mist system was carried out in 70m3. Heptane was used for the pool fire extinguishing experiment. Experiment lab size are the length 2.8m, width 4.8m and the height 5.2m. The purpose of this study was to find out the extinguishing characteristic of water mist ...
The extinguishing experiment with water mist system was carried out in 70m3. Heptane was used for the pool fire extinguishing experiment. Experiment lab size are the length 2.8m, width 4.8m and the height 5.2m. The purpose of this study was to find out the extinguishing characteristic of water mist fire extinguishingsystem and especially, to find out the mechanism of fire extinguishing performance improvement factor of water mist system using foam solution. The parameter of this experiment are discharging type of nozzle, droplet size, installation height of nozzle, the distance of flame from the center of nozzle, the open/close status of door and foam additives. To obtain the reliability about the results of experiment, it was performed the analysis of DOE(Design of Experiment) and verified the consistence between the result of experiment and the scheme with FDS. With that results, the following conclusion was obtained. First, in case of using a foam solution to put out the fire, the extinguishing time is dramatically reduced than using the only plain water. It is that the suffocative effect of foam agent is added on the cooling and dilute effect of water mist. In order to minimize the extinguishing time of the water mist suppression system using foam solution, the droplet of water mist system have to get the sufficient kinetic energy by it-self to reach on the flame through the buoyant force of the heat and the characteristic of foam agent that minimize the surface tension is also very important. Second, there is a few factors that can be influenced on the extinguishing effect in the water mist suppression system. The height from nozzle to the ground, the distance from the center of fire source, the droplet size of water and the open/close status of door. Among these factors, the distance from the center of fire source is greatly influenced on the extinguishing time and the open and close status of door is relatively little compare to the other factors. Third, based on the fire extinguishing experiment according to the distance from the center of nozzle, the extinguishing time of A-type nozzle is shorter than of B-type nozzle and it is the reason that the oxygen substitution effect of vaporization is excellent because the swirl inserted A-type nozzle increasing the kinetic energy of water mist increase and the interaction between the flame and water mist is more activated. The extinguishing time of C-type nozzle is more shorter than the extinguishing time of A-type nozzle and the reason is that the flow rate (K-Factor) of C-type nozzle is much larger than the flow rate of A-type nozzle and the discharging rate and momentum is much larger also. Fourth, in the fire extinguishing experiment using a same size of fire, the distance from the center of nozzle to the fire source is getting far away, the extinguishing time is getting increased. Especially, in case of B and C-type nozzle, the discharging density of water mist that reach on the flame is reduced and the vapor replacement and cooling effect is reduced. With this result, the extinguishing time of B and C-type nozzle is increased. Finally, when it is compared the actual result of the experiment with the scheme using FDS, the trend of the experiment that have an effect on the extinguishing time depending on the distance from the nozzle is relatively consistent with the result of FDS and the change of circumstance is effected on the extinguishing time too.
The extinguishing experiment with water mist system was carried out in 70m3. Heptane was used for the pool fire extinguishing experiment. Experiment lab size are the length 2.8m, width 4.8m and the height 5.2m. The purpose of this study was to find out the extinguishing characteristic of water mist fire extinguishingsystem and especially, to find out the mechanism of fire extinguishing performance improvement factor of water mist system using foam solution. The parameter of this experiment are discharging type of nozzle, droplet size, installation height of nozzle, the distance of flame from the center of nozzle, the open/close status of door and foam additives. To obtain the reliability about the results of experiment, it was performed the analysis of DOE(Design of Experiment) and verified the consistence between the result of experiment and the scheme with FDS. With that results, the following conclusion was obtained. First, in case of using a foam solution to put out the fire, the extinguishing time is dramatically reduced than using the only plain water. It is that the suffocative effect of foam agent is added on the cooling and dilute effect of water mist. In order to minimize the extinguishing time of the water mist suppression system using foam solution, the droplet of water mist system have to get the sufficient kinetic energy by it-self to reach on the flame through the buoyant force of the heat and the characteristic of foam agent that minimize the surface tension is also very important. Second, there is a few factors that can be influenced on the extinguishing effect in the water mist suppression system. The height from nozzle to the ground, the distance from the center of fire source, the droplet size of water and the open/close status of door. Among these factors, the distance from the center of fire source is greatly influenced on the extinguishing time and the open and close status of door is relatively little compare to the other factors. Third, based on the fire extinguishing experiment according to the distance from the center of nozzle, the extinguishing time of A-type nozzle is shorter than of B-type nozzle and it is the reason that the oxygen substitution effect of vaporization is excellent because the swirl inserted A-type nozzle increasing the kinetic energy of water mist increase and the interaction between the flame and water mist is more activated. The extinguishing time of C-type nozzle is more shorter than the extinguishing time of A-type nozzle and the reason is that the flow rate (K-Factor) of C-type nozzle is much larger than the flow rate of A-type nozzle and the discharging rate and momentum is much larger also. Fourth, in the fire extinguishing experiment using a same size of fire, the distance from the center of nozzle to the fire source is getting far away, the extinguishing time is getting increased. Especially, in case of B and C-type nozzle, the discharging density of water mist that reach on the flame is reduced and the vapor replacement and cooling effect is reduced. With this result, the extinguishing time of B and C-type nozzle is increased. Finally, when it is compared the actual result of the experiment with the scheme using FDS, the trend of the experiment that have an effect on the extinguishing time depending on the distance from the nozzle is relatively consistent with the result of FDS and the change of circumstance is effected on the extinguishing time too.
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