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중저압 물분무를 이용한 객차내 화재진압에 관한 실험 및 수치해석적 연구
양승신(Seung-Shin Yang),노재성,유홍선(Hong-Sun Ryou),김동현(Dong-Hyun Kim),정우성(Woo-Sung Jung),장용준(Yong-Jun Jang) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The present study investigates the effect of fire suppression using a mid-low pressure water mist in a carriage fire. The fire extinguishing time and temperature distributions below ceiling in the enclosed compartment of 2.9 m × 2.8 m × 5.0 m are measured by stopwatch and k-type thermocouples for various fire positions. The numerical simulations are extensively performed using Fire Dynamics Simulator (FDS, Ver. 4.0) code and the predictions are compared with experimental data. The prediction results are good agreement with the measured maximum temperature in the all cases. Whereas the predicted temperature is about 40℃ higher than the measured temperature after operating of water mist. The predicted fire extinguishing times are compared with those of measured data. Fires are extinguished within 200 seconds at the experiment in Case 2 and Case 3. But in Case 1 fire is not extinguished in the numerical simulation. The reason of the discrepancy between predicted and measured data is that a simple suppression algorithm has been implemented in FDS. due to the difference of physical phenomenon during the operating of water mist. Also, various databases of fire properties for combustible materials and more elaborate model considering the water mist are required for better predictions of the cooling and suffocation effect.
터널 화재시 종류식 환기가 연소율 변화에 미치는 영향에 관한 실험적 연구
양승신(Seung Shin Yang),김성찬(Sung Chan Kim),유홍선(Hong Sun Ryou) 한국암반공학회 2005 터널과지하공간 Vol.15 No.1
본 연구는 터널대 화재 발생시 종류식 환기가 연소율 변화에 미치는 영향을 파악하기 위하여 Froude scaling에 의해 1/20크기로 축소한 모형화재 실험을 수행하였다. 화원으로는 8.5 ㎝-14.5 ㎝의 메탄올을 사용하였으며 발열량은 3.57 - 10.95㎾이다. 연소율은 로드셀을 이용하여 산출하였고, 연기거통을 파악하기 위하여 K형 열전대를 이용하여 온도분포를 측정하였다. 풍동은 터널의 한쪽부분과 연결하였고, 터널 공간의 배연속도를 제어하기 위하여 풍동의 전압을 조절하였다. 메탄올 화재인 경우 배연속도가 증가할수록 냉각효과로 인하여 연소율은 감소하였으며, 또한 같은 무차원속도(⊽)일때 화원 크기가 커짐에 따라 연소율은 감소하였다. In this study, the l/20 reduced-scale experiments using Froude scaling were conducted to investigate the effect of longitudinal ventilation on the variation of burning rate in tunnel fires. The methanol square pool fires with heat release rate ranging from 3.57 ㎾ to 10.95 ㎾ were used. The burning rate of fuel was obtained by measured mass using load cell and temperature distribution were measured by K-type theomocouples in order to investigate smoke movement. The wind tunnel was connected with one side of the tested tunnel, and logitudinal ventilation velocity in the tested tunnel was controlled by power of the wind tunnel. In methanol fire case, the increase in ventilation velocity decreased the burning rate due to the direct cooling of fire plume. for the same dimensionless velocity(⊽), burning rate decreased as the size of pool fire increased.
터널 화재시 배연속도가 연소율변화에 미치는 실험적 연구 - Heptane 풀화재 경우
유홍선,양승신,Ryou, Hong-Sun,Yang, Seung-Shin 한국터널지하공간학회 2005 터널기술 Vol.7 No.2
본 연구는 터널내 화재시 배연속도가 연소율 변화에 미치는 영향을 파악하기 위하여 Froude scaling에 의해 1/20 크기로 축소한 모형화재 실험을 수행하였다. 화원으로는 4.5cm~8.5cm의 헵탄을 사용하였으며 발열량은 3.71~15.6 kW이다. 연소율은 로드셀을 이용하여 산출하였고, 연기거동을 파악하기 위하여 K형 열전대를 이용하여 온도분포를 측정하였다. 풍동은 터널 상류 한쪽부분과 연결하였고, 터널 공간의 배연속도를 제어하기 위하여 풍동의 인버터를 조정하였다. 헵탄 풀화재인 경우 배연속도가 증가할수록 충분한 산소의 공급으로 연소율은 증가하였으며, 같은 무차원 속도($\bar{V}$) 일때 화원 크기가 작아짐에 따라 연소율은 증가하였다. In this study, the 1/20 reduced-scale experiments using Froude scaling were conducted to investigate the ventilation velocity of the variation of burning rate in tunnel fires. The heptane square pool fire with heat release rate ranging from 3.71~15.6 kW were used. The burning rate of fuel was obtained by measuring mass using load cell and temperature distributions were measured by K-type theomocouples in order to investigate smoke movement. The ventilation velocity in the tested tunnel was controlled by inverter of the wind tunnel. In heptane pool fire case, the increase in ventilation velocity incresed the burning rate due to the direct supply of oxygen to the fire plume. For the same dimensionless velocity($\bar{V}$), burning rate increased as the size of pool fire decreased.