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화재 발생시 환기방식에 따른 지하공동구내 열유동 특성 연구
김홍식(H.-S. Kim),황인주(I.-J. Hwang),김윤제(Youn J. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
The underground utility tunnels are important facility as a mainstay of country because of communication<br/> developments. The communication and electrical duct banks as well as various utility lines for urban life are<br/> installed in the underground utility tunnel systems. If a fire breaks out in this life-line tunnel, the function of<br/> the city will be discontinued and the huge damages are occurred. In order to improve the safety of life-line<br/> tunnel systems and the fire detection, the behaviors of the fire-induced smoke flow and temperature<br/> distribution are investigated. In this study we assumed that the fire is occurred at the contact or connection<br/> points of cable. Numerical calculations are carried out using different velocity of ventilation in utility tunnel.<br/> The fire source is modeled as a volumetric heat source. Three-dimensional flow and thermal characteristics in<br/> the underground tunnel are solved by means of FVM (Finite Volume Method) using SIMPLE algorithm and<br/> standard κ-ε model for Reynolds stress terms. The numerical results of the fire-induced flow characteristics in<br/> an underground utility tunnel with different velocity of ventilation are graphically prepared and discussed.
김홍식(H.-S. Kim),황인주(I.-J. Hwang),김윤제(Youn J. Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
In order to evaluate the performance of fire-fighting agents used to protect structures from heat and fire damages, the thermal characteristics of fire-protection foams are experimentally investigated. The current research focuses on the destruction of a fire-fighting foam subjected to heat radiation. A simple repeatable test for fire-protection foams subjected to fire radiation is developed. This test involves foam generation equipment, a fire source for heat generation, repeatable test procedures, and data acquisition techniques. Results of the experimental procedure indicated that each thermocouple within the foam responded in a similar manner and gradually to a temperature of 15℃~20℃. At this point, each trace generally rises to a temperature of approximately 90℃. The temperature gradient in the foam as time passes increases with increased foam expansion ratio. In addition, it is determined that the temperature gradient along the foam for depth decreases with increased foam expansion ratio.