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대심도 지하역사에서의 화재시 연기거동과 피난에 대한 수치해석 연구
김홍진(Hong-Jin Kim),배승용(Sung-Yong Bae),최영기(Young-Ki Choi),홍기배(Gi-Bae Hong),유홍선(Hong-Sun Ryou) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Advantages of the deeply underground subway are underground space efficiency high speed decrease of noise and vibration. However when fire occurs in the deeply underground subway station large casualties are occurred like Daegu subway station fire due to the increase of evacuation distance. In this study a numerical analysis was performed by using the fire and evacuation analysis program FDS+EVAC for smoke movement and evacuation in Beotigogae station among the deeply underground subway station. Heat release rate of carriage fire was set 10MW and the fire growth rate was ultrafast. As a result the smoke move to the exit at 1085 second. The total evacuation time took 956 second.
압출관에서의 압력 및 유형변화에 따른 유체유동에 관한 연구
김종억,이한영,홍기배,Kim, Jong-Eok,Lee, Han-Yeong,Hong, Gi-Bae 대한의용생체공학회 1984 의공학회지 Vol.5 No.1
In order to research the flow in the thin wall compliant tube, this present study is attempt to measure the cross sectional area according to change of external pressure and flow by ultrasonic method different from willy used impedance technique for flow analysis about one dimensional Steads flow. The experimental results are as follows. 1) Measurement of cross sectional area ratio by ultrasonic method by comparison with experimental results of impedance technique & theoretical results were well consent. 2) Pressure difference of upstream and down stream is alwap's maximum range at 0.4 < $\alpha$ <0.5, and have no connection with changing external pressure. 3) when the external pressure is fixed and resistance is varied, Self excited oscillation occurs in the region at 0.5 < $\alpha$ <0.6, and oscillation disappear almost at R2>=1.2
실내공간에서 화재 발생위치에 따른 연기거동에 대한 실험연구
유홍선,정진용,이재하,홍기배,Yu, Hong-Seon,Jeong, Jin-Yong,Lee, Jae-Ha,Hong, Gi-Bae 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.5
In order to investigate the smoke movement in three dimensional room fires, the center fire, wall fire and corner fire plume in different sized fires were studied experimentally by rectangular pool fire using methanol as a fuel. As the fire size became larger for the center fires placed at the center of the floor, the air flow rate entrained through the opening, average hot layer temperature, flame angle deflected backwards and mean flame height was observed to increase. On the other hand, as the fire size became smaller, the neutral plane height in the door and time reached steady-state was observed to decrease. The average hot layer temperature, mean flame height and doorway neutral plane height obtained from comer fire were higher than those produced by wall fires and center fires. The simple model for describing the effect of walls on the mean flame height was presented. It was shown that the model provides a good description of the present measurements, when used with the assumption by Hansell(1993), that the increase of the average flame height is equal to the ratio of the open to the total perimeters of the trays. Also the two models for predicting the effects of walls on the mean flame height were presented. These models overestimated the measured values of the mean flame height above fuel trays close to a wall and in a corner by approximately 19-26%, respectively.
유리커튼월 시스템에서 커튼월용 노즐과 윈도우 스프링클러의 열차단 성능 분석
김지태(Kim, Ji Tae),남준석(Nam, Jun Seok),홍기배(Hong, Gi Bae),김동준(Kim, Dong Joon),성건혁(Sung, Kun Hyuk),유홍선(Ryou, Hong Sun) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.1
유리커튼월을 사용하는 건축물은 화재시 유리재와 층간재가 프레임의 열변형에 의해 파손되며 화재가 전파된다. 따라서 파손 방지를 위해 열 차단을 하는 것이 중요하며 본 연구에서는 열차단을 위해 사용되는 윈도우 스프링클러와 커튼월용 노즐의 열차단 성능을 실험을 통해 분석하였다. 실험은 ISO 9705 공간에 커튼월을 부착하여 수행하였다. 그 결과 크랙이 시작되는 프레임 상부의 온도가 커튼월용 노즐이 윈도우 스프링클러에 비해 최대 25도 낮았다. 또한 커튼월용 노즐은 윈도우 스프링클러에 비해 약 37.5% 적은 유량으로 30도 이하로 제어되지만 기존 윈도우 스프링클러는 50도에서 시간에 따라 지속적으로 상승하여 파손 방지에 문제가 발생할 수도 있을 것으로 판단되었다. 이러한 원인은 커튼월용 노즐은 커튼월 전체를 덮는 유동이 있는 반면 윈도우 스프링클러는 최상부에만 분사 후 아래로 유리를 타고 흐르다가 중간 프레임에 막혀 수막 형성에 문제가 생기기 때문이다. 따라서 커튼월용 노즐의 분무 패턴이 열차단에 효과적이며 기존 윈도우 스프링클러에 비해 우수한 성능을 확보한 것으로 판단된다. Preventing breakage of glass in curtain wall is important to control fire propagation. In this study, thermal protect performance is analyzed by comparing curtain wall nozzle and window sprinkler. The curtain wall is installed at ISO 9705 space. The maximum temperature of curtain wall nozzle is 25 ℃ lower than window sprinkler at top of frame. Moreover, the curtain wall nozzle is maintained temperature about 30 ℃, but window sprinkler increase over 50 ℃ at top of frame, even with the flow rate of curtain wall nozzle has 37.5% less compared to window sprinkler. Because, the curtain wall nozzle sprayed water toward all side of curtain wall, but the window sprinkler sprayed water only on top and then water film is blocked in intermediate frame. Therefore, the spray pattern of the curtain wall nozzle is effective for thermal protect and has superior performance compared to the window sprinkler.
지하구내 OF 케이블의 화염전파속도와 연기거동속도 특성
홍기배 충주대학교 2006 한국교통대학교 논문집 Vol.41 No.-
The Eexperimental study was performed to characterize the surface flame propagating velocity along the OF cable in the underground utility fire. Temperatures of oil filled OF cable and dried OF cable with the diameter of 90 mm were measured using thermocouple and data log system. It was found that the surface propagating flame velocity of the three OF cables is 2.1~2.8 times faster than that of one OF cable case. and the smoke movement velocity of the three OF cables is 1.38 times faster than that of one OF cable case. The results show that the surface propagating flame velocity and smoke movement velocity became larger as increase of the number of cable, the volume of alkyl-benzene oil in the cable. The characteristics of surface propagating flame velocity and smoke movement velocity in the OF cable can be helpful to fire suppression system in utility.
밀폐공간내의 피가열체 존재시 자연대류 및 복사열전달에 관한 연구
洪起培 충주대학교 산업대학원 1999 大學院論文輯 Vol.1 No.-
A combined natural convection and radiation in a square enclosure is studied numerically. A solid recieving heat from hot wall is located in enclosure with a radiating gray gas. The discrete ordinate method(DOM) is used for solving the radiative transport equation. The effects of optical thickness,Plank number,wall emissivity and fluid-solid thermal condutivity ratio were investigated on the flow and temperature fields. Based on the results on this study, serveral parameter are found to influence the temperature distribution.