隧道混合燃料火灾燃烧蔓延特性实验研究

隧道火灾一直是火灾科学研究领域的重要问题之一。近年来,隧道火灾中由于燃油泄漏而引起的火蔓延现象是一个新兴的研究热点。利用小尺寸(1:10)的隧道火灾模拟实验平台,开展了薄油、窄油池机制下不同混合比例下正丁醇-柴油燃烧特性实验研究。结果表明,根据正丁醇比例,可将正丁醇-柴油混合燃料分为两类。当正丁醇比例不大于20%时,主火焰蔓延速度线性增大,闪燃火焰则由间断变为持续存在且波长由14.17 cm减小到8.42 cm;油面温升速率逐渐增大;当正丁醇比例大于20%时,主火焰蔓延速度接近正丁醇蔓延速度(3.33 cm/s),闪燃火焰持续存在且波长在8.3 cm左右;油面温升速率基本相同。研究结果为认识隧道混合燃料火灾燃烧特性提供了参考。

Experimental study on the combustion and flame spreading characteristics of tunnel mixed fuel fire

Tunnel fire has always been an important issue in the field of fire science. In recent years, the spread of fire caused by fuel leakage in tunnel fire is a new research hotspot. In this paper, the combustion characteristics of n-butanol diesel oil at different mixing ratios were studied by using a small size (1:10) tunnel fire simulation experimental platform. The results show that n-butanol diesel blended fuel can be divided into two categories according to the proportion of n-butanol. When the proportion of n-butanol is not more than 20%, the spread speed of the main flame increases linearly with the increasing proportion, the flaming flame becomes continuous and the wavelength decreases from 14.17 cm to 8.42 cm, and the temperature rise rate of the oil surface increases gradually. When the proportion of n-butanol is greater than 20%, the spread speed of the main flame is close to the spread rate of n-butanol (3.33 cm/s), and the flaming flame persists and its wavelength is 8.3 cm approximately. At the same time, the temperature rise rate of oil surface is basically the same. The study provides a reference for understanding the spreading characteristics of blended fuel fires in tunnel.