摘要在固体火的研究中，木垛火是理想的实验火源。本文设计了11种不同结构的木垛，在特定的实验装置内进行燃烧实验，采用1只水冷式热通量传感器及1只片状热通量传感器测量木垛火的热通量，同时在实验装置内安装6只铠装热电偶测量火焰温度，利用天平采集木垛燃烧过程中的质量变化。分析木垛火的热通量、火焰温度、质量变化速率及三者之间关系。63644

实验结果表明：距火焰中心30cm处，Gardon热通量计测得的热通量在6—17kW/m2，距火焰中心70cm处，片状热通量计测得的热通量在0.3—0.8kW/m2；2只热通量计所测得的热通量在数值上近似符合热辐射定律，即与距离的立方成正比。木垛火焰的最高温度在800℃左右，且火焰温度随木垛质量的增大而增高。实验中木垛火的热通量未能与木垛质量、火焰温度形成较好的相关性。

毕业论文关键词  木垛  燃烧  热通量  火焰温度  燃烧速率

毕业设计说明书（论文）外文摘要

Title    Experimental Study on the heat flux of Wood Cribs fire

Abstract

Wood crib fire has been considered as an ideal experimental fire source. This study designed 11 kinds of wood cribs with different structures. Those cribs were ignited in specific experimental devices, which contains water cooled heat flux sensor, flaky heat flux sensors, 6 thermocouples and An electronic balance. Heat flux, flame temperature of the flame and the wood crib consumption rate were measured in the experiments.

The experimental results show that: 30 cm from the center of the flame, Gardon heat flux meter measured heat flux in the 6-17 kW/m2, 70 cm from the center of the flame, flaky heat flux meter measured heat flux in the 0.3-0.8 kW/m2; 2 only heat flux meter measured the heat flux on the numerical approximation conforms to the law of thermal radiation, namely the direct ratio with distance. The highest temperature of the tested wood crib fire was about 800 ℃.The flame temperature was increased with the rise of the mass of wood cribs. However, there is no apparent relation among the heat flux, wood crib weight and the flame temperature.

Keywords  Wood crib  burning  heat flux  flame temperature  burning rate

 1  引言 1

1.1  有关木垛火的研究概况 1

1.2  有关热通量的描述 2

1.3  本课题研究内容 4

2  火灾中热通量及温度的测量 4

2.1  热通量测量原理 4

2.2  热通量传感器分类 4

2.3  热电偶测温的基本原理和结构 8

2.4  热电偶的种类 9

3  木垛火的实验研究 11

3.1  实验装置设计 11

3.2  实验木垛准备 12

4  实验结果 13

4.1  木垛燃烧现象 13

4.2  木垛火焰温度 14

4.3  木垛火焰热通量 15

4.3  木垛质量燃烧速率 21

结  论 22

致  谢 23

参考文献 24 

1  引言