摘要火旋风是火焰受气流影响发生旋转燃烧的现象，在森林火灾和城市建筑火灾中常有发生。研究火场进风口的长宽比对研究火旋风的形成及预防火旋风的产生具有重要意义。本文利用六侧缝水平槽道火旋风发生装置，通过改变火场进风口的长宽比，研究火场进风口长宽比对火旋风燃烧特性的影响。实验发现在火场进风口的长宽比由大到小改变的过程中，火旋风的火焰温度、火焰高度、进风口处的平均风速及火旋风的形成时间均呈现由低到高的变化情况。个人推测是由于进风口长宽比改变所导致进风口中心高度及宽度变化对火旋风形成造成的综合影响。实验得出火场进风口的长宽比在2和1之间最有利于形成火旋风，且形成的火旋风相比其他进风口长宽比条件具有更强的稳定性、更大的强度和火焰高度。64157

关键词  火旋风  进风口形状  燃烧特性  最佳进风口长宽比

毕业设计说明书（毕业论文）外文摘要

Title    The research about the shape of fire inlet affect fire  whirl combustion characteristic                                                 

Abstract Fire whirl is the phenomenon that airstream rotated by the flame burning. Fire whirl was often found in forest fires and urban building fires. The study of aspect ratio of inlet fire is vital important to research and prevent from formation of fire whirl. In this paper, we used six levels of channel side seam fire whirlwind generating device to generate fire whirl. And research the influence of inlet aspect ratio on combustion characteristics of fire by changing the aspect ratio of the inlet fire. It was found that the aspect ratio of the inlet in the fire descending process of variation, the flame temperature of fire whirl, flame height, the average wind speed at the inlet and the formation time of the fire whirl showed variation from low to high. Personal presumably due to variation caused by the inlet aspect ratio inlet height and width change on the center fire. It caused the combined effects of cyclone formation. Experimental results is that the aspect ratio of the inlet fire between 2 and 1 is the most conducive condition to the formation of fire whirl, and the formation of fire cyclone inlet aspect ratio compared to other conditions with greater stability, greater strength and flame height.

Keywords  fire whirl  air inlet shape  combustion characteristic  best inlet aspect ratio

 目   次              

 1  绪论 1

 1.1 课题研究背景 1

 1.2 研究现状 1

 1.2.1 国外研究现状 1

 1.2.2 国内研究现状 2

 1.3现有研究存在问题或不足 3

 1.4本论文工作 3

 2  实验仪器和原理方法 4

 2.1实验发生装置 4

 2.2 实验测试仪器 5

 2.2.1  K型热电偶