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밑면이 부분 가열체를 갖는 정사각 밀폐공간내의 자연대류와 화재감지에 관한 연구
추병길 한국산업안전학회 1990 한국안전학회지 Vol.5 No.2
In this paper, the natural convection in a square enclosure, partly heated from below, with two adiabatic vertical wall and one upper horigental wall is studied numerically. In numerical study, SIMPLE(Semi-Implicit for Pressure Linked Equation) algorithems are applied for the integration of momentum and energy equation. The grid size used in this study is the coordinates of size (22×22). As a result of numerical analysis, the initial fluid flow depends on the thermal diffusion, but, as time passes, the fluid flow depends on convection and buoyancy of the enclosure. In Gase 1, the heating region was been in the central position of the bottom wall. In cases 2, the heating region was in the left position of the bottom. In case of Case 1, the lapse time of sensing the temperature of 72℃ is approximately 15 sec almost at the same time in the coordinates (6, 22), (11, 22). In case of Case 2, the lapse time in the coordinates (6, 22), (11, 22) was 27 sec, 25 sec repectively. Also in case of Case 1 or Case 2, the gradients of y-position of the two sensors are transposed each other.
밀폐공간내 화재에 의한 생성된 연소가스 분석 및 유동에 관한 연구
추병길,조성곤 한국산업안전학회 1997 한국안전학회지 Vol.12 No.1
The natural convection and combined heat transfer induced by fire in a rectangular enclosure is numerically studied. The model for this numerical analysis is partially opened, it is divided by a vertical baffle projecting from ceiling. The solution procedure includes the standard k-ε model for turbulent flow and the discrete ordinates method (DOM) is used for the calculation of radiative heat transfer equation. In this study, numerical simulation on the combined naturnal convection and radiation is carried out in a partial enclosure filled with absorbed-emitted gray media, but is not considered scattering problem. The velocity vectors, streamlines, and isothermal lines are compared the results of pure convection with those of the combined convection radiation, the combined heat transfer. Comparing the results of pure convection with those of the combined convection-radiation, the combined heart transfer analysis shows the stronger circulation than those of the pure convection. Three different locations of heat source are considered to observe the effect of heat source location on the heat transfer phenomena. As the results, the circulation and the heat transfer in the left region from heating block are much more influenced than those in the right region. It is also founded that the radiation effect cannot be neglected in analyzing the building in fire.
소화용 스프링클러 헤드의 살수분포 및 수적 특성에 대한 연구
추병길,최종욱,차경세 한국산업안전학회 2001 한국안전학회지 Vol.16 No.2
The effect of water spray for the fire sprinkler depends on droples distribution over maximum possible floor area. The present study are carried out for the characteristics of water spray and droplets experimentally and numerically from two fire sprinkler heads which are CHM head and CHl head. CHM head is self-production and CHl head is widely used up to date. As the result of using CHM head, water spray and droplets are distributed over large area, because CHM head has smooth surface and non-flamed shape. When the pressure of fire sprinkler head is low, SMD(sauter mean dieter) is large and when the pressure of fire sprinkler head is high, SMD is small.
개구부가 있는 밀폐공간내 화재의 복합열전달 및 연소가스 분석에 관한 연구
박찬국,추병길,김철 (社團法人)韓國火災·消防學會 1997 한국화재소방학회논문지 Vol.11 No.1
The natural convection and combined heat transfer induced by fire in a rectangular enclosure is numerically studied. The model for this numerical analysis is partially opened right wall. The solution procedure includes the standard k-ε model for turbulnt flow and the discrete ordinates method (DOM) is used for the calculation of radiauve heat transfer equation. In numerical study, SIMPLE algorithm is applied for fluid flow analysis, and the investigations of combustor gas induced by fire is performed by FAST model of HAZARDI program. In this study, numerical simulation on the combined naturnal convection and radiation is car ried out in a partial enclosure fifed with absorbed emitted gray media, but is not considered scattering problem. The streamlines, isothermal lines, average radiation intensity and kinetic energy are compared the results of pure convection with those of the combined convection-radiation, the combined heat transfer. Comparing the results of pure convection with those of the combined convection-radiation, the combined heat transfer analysis shows the stronger circulation than those of the pure convection. Three different location of heat source are considered to observe the effect of heat source location on the heat transfer phenomena. As the results, the circulation and the heat transfer in the left region from heating block are mich more influenced than those in the right region. It is also founded that the radiation effect cannot be neglected in analyzing the building in fire. And as the results of combustion gas analysis from FAST model, it is found that O_2 concentration is decreased according to time. While CO and CO_2 concentration are rapidly increased in the beginning(about 100sec), but slowly decreased from that time on.