火源特性与壁面痕迹关联性研究

发布时间：2018-04-10 03:18

本文选题：火源特性　切入点：燃烧参数　出处：《天津商业大学》2013年硕士论文

【摘要】：随着经济建设的快速发展和人民物质文化生活水平的提高,火灾发生频率越来越高,造成损失也在增大。室内火灾中,墙壁会对火源燃烧产生影响,同时火源燃烧也会在壁面上产生不同程度的痕迹;但目前火源的燃烧特性与壁面痕迹间关联性的研究仍不完善,依旧缺少系统的研究分析。本文对不同实验条件下的火源燃烧特性和壁面痕迹进行了研究,并进一步分析了其随实验条件的变化规律。本文首先对火源燃烧参数进行了理论计算,并介绍了壁面痕迹的形成机理及分类。进而以油盘火作为实验火源进行实验研究,分析了火源大小、距壁面不同距离及燃烧时间不同时,火源的燃烧特性变化规律以及壁面痕迹的表现形式,其中火源的燃烧特性由一系列燃烧参数表示,这些参数包括热释放速率最大值、平均值,火焰高度平均值,火焰温度平均值、最大值,火焰中心线平均温度分布等。研究发现,在火源靠近壁面的情况下,火源的燃烧参数随直径的变化规律与自由燃烧时相近;壁面的存在使火焰燃烧猛烈;随着油盘与壁面距离的减小,壁面对火源参数的影响变得显著;油量的增多延长了燃烧时间,同时使部分燃烧参数值得到增大;燃烧持续时间对火焰温度影响较明显。油盘直径越大、油盘距壁面距离越近、燃烧时间越长壁面痕迹越明显。考虑到实验结果的可再现性,对同种条件下的情况进行了重复性实验,通过分析参数间的标准差,来表征实验的误差。本文的主要侧重部分为火源燃烧参数的分析,通过对实验数据进行公式拟合,来表征参数变化规律。由于缺乏痕迹特征的定量描述参数,本文对壁面的痕迹特点只进行了简单的定性描述。希望后期研究能扩充壁面痕迹的定量描述参数,以便统一描述;还可从火源类型、壁面粗糙度等方面开展实验研究,使实验更加完善。
[Abstract]:With the rapid development of economic construction and the improvement of people's material and cultural living standard, the frequency of fire occurs more and more frequently, and the loss is also increasing.In the indoor fire, the wall will have an impact on the combustion of the fire source, and at the same time, the combustion of the source of fire will also produce traces on the wall to varying degrees, but the research on the correlation between the burning characteristics of the fire source and the trace of the wall is still not perfect.There is still a lack of systematic research and analysis.In this paper, the combustion characteristics and wall traces of the fire source under different experimental conditions are studied, and the variation of the characteristics with the experimental conditions is further analyzed.In this paper, the combustion parameters of fire source are calculated theoretically, and the formation mechanism and classification of wall trace are introduced.Then, the oil pan fire was used as the experimental fire source to carry on the experiment research, analyzed the fire source size, the different distance from the wall surface and the burning time different time, the fire source combustion characteristic change rule and the wall trace expression form.The combustion characteristics of the fire source are expressed by a series of combustion parameters including the maximum heat release rate average flame height average flame temperature maximum and mean temperature distribution of the central line of the flame.It is found that when the fire source is near the wall, the variation of the combustion parameters with the diameter is similar to that of the free combustion; the existence of the wall makes the flame burn violently; with the decrease of the distance between the oil pan and the wall,The influence of the wall on the parameters of the fire source becomes significant, the increase of the oil content prolongs the combustion time and the value of the partial combustion parameters increases, and the combustion duration has a more obvious effect on the flame temperature.The larger the diameter of the oil disk, the closer the distance from the oil disk to the wall, and the longer the burning time is, the more obvious the wall trace is.Considering the reproducibility of the experimental results, repeated experiments were carried out under the same conditions, and the error of the experiment was characterized by analyzing the standard deviation between the parameters.The main emphasis of this paper is the analysis of the combustion parameters of the fire source. The formula fitting of the experimental data is used to characterize the variation of the parameters.Due to the lack of quantitative description parameters of trace features, this paper gives a simple qualitative description of the trace characteristics of the wall.It is hoped that the later study can expand the quantitative description parameters of the wall trace in order to describe it uniformly, and can also carry out experimental research from the fire source type, wall roughness and so on, so as to make the experiment more perfect.
【学位授予单位】：天津商业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU998.1

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