【作者】 倪佳迪；

【导师】 秦俊；

【作者基本信息】 中国科学技术大学 ， 安全技术及工程， 2011， 硕士

【摘要】 隧道等狭长空间的日益发展,在给人们带来方便的同时,也存在巨大的火灾隐患。航空煤油作为军事、交通等领域广泛应用的高热值燃料,是燃油泄漏火灾事故中的重大危险源。前人已开展了一些有关航空煤油的研究,但对于狭长空间内通风环境下航空煤油池火的燃烧特性研究甚少;此外,由于隧道火灾事故频发,人们对狭长空间提出更高的火灾防治要求。细水雾以其清洁、高效等优点而备受欢迎,但关于狭长空间内通风环境下细水雾的研究相对较少。基于前人研究工作的不足,本文自行设计、搭建了小尺度狭长空间实验台,选择纵向通风这一狭长空间内的典型通风形式,以小尺度航空煤油池火为研究对象,采用实验模拟并辅以FDS数值模拟的方法,分别研究了狭长空间内纵向通风条件下正方形航空煤油池火的燃烧特性及细水雾对其抑制效果。在小尺度狭长空间模拟实验台上,利用电子天平、烟气分析仪等实验仪器及数据采集系统,开展了纵向通风条件下正方形航空煤油池火的模拟实验。通过改变纵向风速、油池面积和油池深度,深入研究了纵向风速、油池面积及油池深度对正方形航空煤油池火燃烧特性的影响,通过对比各种工况的实验结果,得到一定的变化规律,结合温度等参数,从机理方面进行了探讨。同时,利用FDS进行了辅助计算,计算模拟结果与实验模拟结果比较吻合。基于上述关于航空煤油燃烧特性的研究,结合细水雾发生系统,较为细致地开展了狭长空间内纵向通风条件下细水雾抑制正方形航空煤油池火的模拟实验。通过改变纵向风速、油池面积、细水雾工作压力等参数,研究了细水雾抑制航空煤油池火的有效性,分析了纵向风速、油池面积和细水雾工作压力对细水雾抑制航空煤油池火性能的影响,探讨了细水雾抑制航空煤油池火的主导机理。本文的研究为通风条件下航空煤油池火的燃烧特性及细水雾抑制增添了实验数据,有利于更全面地掌握航空煤油池火的特性,并为此类火灾的防治与扑救奠定了基础。更多还原

【Abstract】 With the increasing development of the building of long and narrow space suchas tunnels, which bring convenience to daily life, fire risk also improves rapidly.Aviation fuel, with high combustion heat, is widely used in chemical industryproduction and transport processes and other areas. Meanwhile it is the risk source inthe fuel-spilled-fires. Predecessors have carried out some research on aviation fuel,but few studies on combustion characteristics of aviation fuel under longitudinalventilation in long and narrow space have been done. In addition, with high frequencyof tunnel fire disasters, higher requirements for suppressing and extinguishing firewill be necessary. Water mist technology is very popular for fire suppression in recentyears due to many advantages, such as clean, high fire extinguishing, low cost andlittle damage to protected objects etc. However, study on water mist used in long andnarrow space under longitudinal ventilation is relatively few. On the base ofinadequacy of research of formers, with experimental and numerical simulation,combustion characteristics of square aviation fuel pool fire and fire suppressioneffectiveness of water mist in long and narrow space under longitudinal ventilationwill be investigate in this paper. In order to conduct the experiments conveniently, asmall-scale experimental platform of long and narrow space was built. Andlongitudinal ventilation was selected as the typical form of ventilation.Experiments of square aviation fuel pool fire were carried out on the small-scaleexperimental platform above. Experimental apparatus, such as electronic balance,intelligent flue gas analyzer, and data acquisition system were used in the experiments.A thorough study on the effect of longitudinal ventilation, pool area and pool depth tothe combustion characteristics of aviation fuel was made by changing longitudinalventilation, pool area and pool depth respectively. A series of change regularities havebeen obtained by comparing different experimental results. The mechanism has beendiscussed from different parameters, such as temperature. In addition, we haveperformed numerical simulations using Fire Dynamics Simulation (FDS). Accordingto our analysis of the related data from experiments and numerical simulations, wefind that numerical and experimental results agree well.Based on study of the combustion characteristics of aviation fuel above, a seriesof experiments of extinguishing square aviation fuel pool fire by water mist in thelong and narrow space under ventilation. Some parameters such as longitudinal ventilation, pool area and working pressure of water mist were changed in tests toexamine the effect of these factors on the effectiveness of water mist fire suppression.With experiments on water mist pool fire suppression and analysis of experimentalresults, main mechanism of aviation fuel pool fire suppression by water misthas beensummed up.The present work adds experimental data in the field of aviation kerosene andwater mist study under ventilation in long and narrow space. And can enhancepeople’s comprehension on combustion characteristics of aviation fuel pool fires. Inaddition the study in this paper is useful for fire prevention and fighting.更多还原