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.

利用火灾动力学模拟器，对倾斜沟渠内均质燃料床的坡度和沟渠倾斜度对野火蔓延的影响进行了数值研究。该模拟基于固-气两相数值模型，该模型结合了侧柏叶的物理化学燃烧特性。结果表明，随着坡度和沟渠倾斜度的增加，火势蔓延速度加快。火焰前锋倾斜直至其附着到燃料床，倾斜角度范围为 20.9° 至 35.2°，并且发现对于 45° 的沟槽倾角，完全附着的临界角度约为 35.2°。增加沟槽倾角会导致临界角减小，因为沟槽壁限制了底部火焰的空气夹带，促进火焰粘附以获得足够的空气。火焰辐射是低坡度下的主要传热机制，随着坡度的增加，对流传热开始相关，并随着沟槽倾斜度的变化而显着变化。该研究为山火倾斜沟渠的早期预防和扑救提供科学见解和指导。