CAJ | 학술논문

地铁隧道属于大长细比的通风受限空间,隧道火灾在一定条件下会出现回燃.地铁隧道1∶8缩尺比例的火灾模型实验表明,决定回燃是否产生的关键参数是燃料挥发份的质量分数,单隧道自然通风条件下的临界值为8.78%;利用燃料的可燃界限图所得到的质量分数的临界值为8.66%,与实验值接近.自然通风条件下的单隧道回燃和腔体回燃相似,但产生回燃的燃料挥发份质量分数的临界值不同.在确定隧道火灾回燃之前,借助于燃料的可燃界限图初步判断其挥发份质量分数临界值的范围,对现场真实火灾回燃的分析和控制有重要的参考价值.
지철수도속우대장세비적통풍수한공간,수도화재재일정조건하회출현회연.지철수도1∶8축척비례적화재모형실험표명,결정회연시부산생적관건삼수시연료휘발빈적질량분수,단수도자연통풍조건하적림계치위8.78%;이용연료적가연계한도소득도적질량분수적림계치위8.66%,여실험치접근.자연통풍조건하적단수도회연화강체회연상사,단산생회연적연료휘발빈질량분수적림계치불동.재학정수도화재회연지전,차조우연료적가연계한도초보판단기휘발빈질량분수림계치적범위,대현장진실화재회연적분석화공제유중요적삼고개치.
Subway tunnel is a kind of limited ventilation space with a large slenderness ratio. Backdraft may take place under certain conditions in tunnel fire. Some experiments have been conducted to the tunnel fire backdraft by the 1/8 reduced-scale model experimental apparatuses. The results indicated that the mass concentration of the volatilized fuel is the key parameter determining the occurrence of backdraft in subway tunnel fire, and the critical value of the mass concentration was equal to 8.78% in the single-tunnel with natural ventilation. And the critical value can be obtained at the same time from the flammability diagram of fue1, which was 8.66%. Under the condition of natural ventilation, the characteristics of backdraft occurred in the single-tunnel was almost the same as that in compartment, while their values were different. Therefore, the flammability diagram of fue1 can be used to find the range of the critical values in a real-scale subway tunnel, which will play an important role in the fire disaster prevention.