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In order to analyze the influence of the abrupt section of the underground pipe gallery on the spread of smoke, this paper uses fire simulation software to establish a numerical model to study and analyze the pipe gallery with abrupt sections. The simulation results show that under the condition of working condition 2, the temperature of the pipe gallery increases and then decreases. The highest temperature is at 182s, and the highest temperature is 698.51°C; in the sudden change section, the smoke spreading rate decreases, and the smoke peak The surface presents a “convex” shape; due to the thermal effect pressure difference and the mechanical wind pressure difference, when the wind speed in the pipe gallery is 0-50s, the wind speed changes greatly; when the inlet wind speed is 1m/s, the wind speed in the pipe gallery will eventually Tend to be 2.5m/s.

Research and Analysis on Fire Simulation of Underground Pipe Gallery Based on Pyrosim Software