Vegetation fires may lead overhead transmission lines to trip and shut down, thereby endangering the power grid’s safe and stable operation. In order to study the changes of vegetation fire spread patterns under the influence of environmental wind, a square fir crib with a size of 1 m×1 m×0.6 m was taken as the research object. A 5 m×5 m×5 m outdoor site with ventilation around was established through FDS software, and simulation studies were conducted on 10 examples, covering wind speeds varying from 1 to 10 m/s. The variation of flame morphology with the magnitude of wind speed was analyzed; The calculation formula for the flame inclination angle applicable within this wind speed range has been fitted; Based on the flame inclination angle variation, the horizontal offset distance was calculated. The flame height, width, and flame area under different environmental wind speeds were simulated and calculated, and the simulation research results were verified through field tests. The results show that when the wind speed is greater, the changes in the flame inclination angle and the horizontal offset distance of the flame are smaller. The research results can serve as a reference for the analysis of the flame morphology of wildfire spreading near the transmission line corridors and the prevention and control of tripping accidents.
Zhai et al. (Thu,) studied this question.