Abstract: In order to ensure the safe operation of the power cabin in the urban integrated pipe gallery, the air volume and resistance during ventilation were studied by means of experiment and numerical simulation. Three fire compartments in the electric cabin of a city's comprehensive pipe gallery were selected as the experimental area.Through the control of fire partition, three experimental areas of different lengths were formed. The section wind speed and the pressure difference between sections in the experimental area were measured. The FLUENT was used to simulate the experiment. The results showed that the resistance is much less than the local resistance. The resistance coefficients along the utility tunnel and the local resistance coefficients are constant when the wind speed reaches a certain value. There are many branch lines and air leakage in the urban utility tunnel, and the length of ventilation partition should not exceed 400 m. When studying the resistance of the power cabin in the utility tunnel, the experimental method and the numerical simulation method basically agree, and the numerical simulation method can study more working conditions.

Key words: urban utility tunnel, power cabin, ventilation; experiment, numerical simulation