山火可能导致架空输电线路跳闸停运，进而危及电网的安全和稳定运行。为了研究植被的火焰倾角在环境风影响下的变化情况，以尺寸为1 m×1 m×0.6 m的方形杉木垛作为研究对象，通过Pyrosim软件建立一个四周通风的5 m×5 m×5 m的室外场地，对风速为1~10 m/s的10个自由燃烧算例进行了模拟研究，分析了火焰形态随着风速大小的变化情况；拟合了适用于该风速范围内的火焰倾角计算公式；根据火焰倾角的变化情况进而得到了火焰的水平偏移距离，并对模拟研究结果进行了现场试验验证。结果表明：在风速越大的情况下，火焰倾角和火焰的水平偏移距离变化越小。该研究结果可为输电线路山火跳闸事故的预防以及输电线路走廊两侧植被的砍伐距离提供参考。

Vegetation fires may lead to tripping and shutdown of overhead transmission lines, thus endangering the safe and stable operation of power grids. In order to study the change of flame inclination of vegetation under the influence of ambient wind, a square fir crib with the size of 1 m ×1 m ×0.6 m was used as the research object, and a 5 m ×5 m ×5 m outdoor site with ventilation was set up by Pyrosim software, and simulation research was carried out on 10 free burning cases with the wind speed of 1 ~ 10 m/s, and the change of the flame pattern with the size of the wind was analysed. The formula for calculating the flame inclination applicable to this wind speed range was fit. The flame inclination calculation formula was based on the flame inclination of this range, and the flame inclination calculation formula was based on the flame inclination of this range. The change of flame shape with the wind speed was analyzed. The formula for calculating the flame inclination angle applicable to the wind speed range was fitted. And the horizontal offset distance of the flame was obtained according to the change of the flame inclination angle. The results show that the larger the wind speed is, the smaller the change of flame inclination and flame horizontal offset distance are. The results of this study can be used as a reference for the prevention of tripping accidents on transmission lines and the cutting distance of vegetation on both sides of transmission line corridors.