Yi Wang, Rui Huang, Fangting Xu, Jiacheng Jia, Yuanfan Ji
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Numerical Simulation of Wildfire Spread in Inclined Trenches
The effects of the slope and the trench inclination on the spread of wildfires with a homogeneous fuel bed in inclined trenches, were studied numerically by Fire Dynamics Simulator. This simulation is based on a solid–gas two-phase numerical model that incorporates the physicochemical combustion characteristics of Platycladus orientales leaves. The results show that the rate of fire spread accelerates with increasing slope and trench inclination. The flame front inclines until it attaches to the fuel bed for slope angles ranging from 20.9° to 35.2°, and it was found a critical angle for full attachment is about 35.2° for trench inclination of 45°. Increasing the trench inclination causes a decrease in the critical angle because the trench wall restricts air entrainment at the bottom flame, promoting the flame to adhere to obtain sufficient air. Flame radiation is the dominant heat transfer mechanism at low slopes, and as the slope increases, convective heat transfer starts to be relevant and significantly changes with the trench inclination. This study provides scientific insights and guidance for early prevention and fire fighting in inclined trenches of wildfires.
期刊介绍:
Fire Technology publishes original contributions, both theoretical and empirical, that contribute to the solution of problems in fire safety science and engineering. It is the leading journal in the field, publishing applied research dealing with the full range of actual and potential fire hazards facing humans and the environment. It covers the entire domain of fire safety science and engineering problems relevant in industrial, operational, cultural, and environmental applications, including modeling, testing, detection, suppression, human behavior, wildfires, structures, and risk analysis.
The aim of Fire Technology is to push forward the frontiers of knowledge and technology by encouraging interdisciplinary communication of significant technical developments in fire protection and subjects of scientific interest to the fire protection community at large.
It is published in conjunction with the National Fire Protection Association (NFPA) and the Society of Fire Protection Engineers (SFPE). The mission of NFPA is to help save lives and reduce loss with information, knowledge, and passion. The mission of SFPE is advancing the science and practice of fire protection engineering internationally.