| 개구부가 있는 밀폐공간내 화재의 복합열전달 및 연소가스 분석에 관한 연구 |
|
박찬국, 추병길, 김철 |
|
1전남대학교 기계공학과2순천공업전문대학 산업안전과3경남지방 중소기업사무소 |
| A Study on the Combined Heat Transfer and Analysis Fire Induced Combustion Gas in a partially Open Enclosure |
|
Park Chan-Kuk, Chu Byeong-Gil, Kim Cheol |
|
|
|
|
| Abstract |
|
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-$varepsilon$ model for turbulent flow and the discrete ordinates method (DOM) is used for the calculation of radiative heat transfer equation. In numerical study, SIMPLE algorithm is applied for fluid flow analysis, and the investigations of combustion gas induced by fire is performed by FAST model of HAZARD I program. 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 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 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. And as the results of combustion gas analysis from FAST model, it is found that O2 concentration is decreased according to time. While CO and CO2 concentration are rapidly increased in the beginning(about 100sec), but slowly decreased from that time on. |
|
PDF Links
Full text via DOI
Download Citation
