纵向风对受限空间内喷淋系统灭火效果的影响研究

发布时间：2018-04-30 12:59

本文选题：纵向风 + 受限空间　；参考：《安徽理工大学》2017年硕士论文

【摘要】：随着国家经济建设加快,受限空间类型的建筑日趋上升,譬如:隧道、地下工程、小室等,因此对受限空间内进行防火、灭火显得格外重要。此类型的受限空间防灭火不同于其他建筑,在该受限空间内,有大量的移动物体,并且两侧无风,只有前后两端有风,这给有风流的受限空间内防火、灭火迎来了新的挑战,特别是对喷淋灭火提出了更高的要求。纵向风对火灾的影响、整个受限空间内的喷淋系的灭火效果的影响,关系着人们的生命安全和财物安全。本文通过对带有纵向风的受限空间内喷淋灭火系统的效果进行实验研究,主要内容有分析对比同一喷淋压力下不同风速对喷淋系统的灭火效果的差别;本次研究主要分为两点,在两个不同火源功率的情况下,通过改变风速来观察喷淋灭火晓得情况;分别为火源功率A情况下纵向风对喷淋灭火的影响;火源功率B情况下纵向风对喷淋灭火的影响;对以上情况主要通过测得火场附近各个点的温度(T)、一氧化碳(CO)浓度变化情况反应控火时间和灭火时间,来判断喷淋灭火的效果。数值模拟也是根据实验平台的尺寸进行设定,在两种工况下,改变风速参数,喷淋系统参数保持不变,设置十二个热电偶,按原有位置进行布置,对原有实验进行模拟,通过切片观察整个受限空间内的温度变化的情况,烟气的蔓延情况等。通过实验和模拟进行对比,可以发现实验和模拟有很高的相似性,喷淋的灭火时间都很接近,受限空间内的温度场分布误差相差不大,最佳风速区间也基本一致。通过试验和模拟得出纵向风速在一定的范围内,是有助于喷淋灭火的;不同的火源功率下,有利的风速区间会有所变化。因此在火灾的现场,一定要注意纵向风速的控制,这关系到施救者和被救者的生命安全,关系到财物损失的严重程度,对保障生命安全和降低经济损失具有实际意义。
[Abstract]:With the acceleration of national economic construction, the construction of restricted space types is rising day by day, such as: tunnels, underground projects, small rooms, etc., so it is particularly important to prevent fire and extinguish fire in restricted space. This type of restricted space is different from other buildings, in which there are a large number of moving objects, and there is no wind on either side, with only the wind at both ends, which brings new challenges to fire prevention in confined space with wind flow. In particular, the sprinkler put forward higher requirements. The influence of longitudinal wind on fire and the fire extinguishing effect of sprinkler system in the whole confined space is related to the safety of people's life and property. Through the experimental study on the effect of spray extinguishing system in confined space with longitudinal wind, the main content of this paper is to analyze and compare the fire extinguishing effect of different wind speed under the same spray pressure. In the case of two different sources of power, the knowledge of sprinkler fire was observed by changing the wind speed; the influence of longitudinal wind on sprinkler extinguishing under the condition of fire source power A, the influence of longitudinal wind on sprinkler extinguishing under the condition of fire source power B, and the effect of vertical wind on sprinkler extinguishing under the condition of fire source power B; The fire control time and fire extinguishing time are determined by measuring the temperature and CO concentration of each point near the fire site to judge the effect of sprinkling fire extinguishing. The numerical simulation is also based on the size of the experimental platform. Under two operating conditions, the parameters of the spray system remain unchanged and the parameters of the spray system remain unchanged. Twelve thermocouples are arranged according to the original position to simulate the original experiment. The temperature change and smoke spread in the confined space were observed by slicing. By comparing the experiment with the simulation, it can be found that the experiment and the simulation have high similarity, the fire extinguishing time of the spray is very close, the temperature field distribution error in the confined space is not different, and the optimum wind speed range is basically the same. Through experiment and simulation, it is found that longitudinal wind speed is helpful to sprinkler fire extinguishing in a certain range, and the favorable wind speed range will change under different fire source power. Therefore, in the scene of fire, we must pay attention to the control of longitudinal wind speed, which is related to the safety of the rescuer and the rescuer, the severity of the loss of property, and has practical significance to ensure the safety of life and reduce the economic loss.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU892

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