Abstract
Abstract In order to study the influence of different section shapes on the temperature distribution of fire in utility tunnel systems, circular and rectangular cross-sectional shapes of tunnels are established. In this paper, combustion behaviors are represented by setting volumetric heat source, and the temperature data of the measuring points is analyzed. The results showed that the smoke temperature of the circular tunnel was higher than that of the rectangular section at the same location in the longitudinal direction, and the temperature reduced faster in the range of 30 m away from the fire source. On the cross section of the fire, the smoke temperature in the middle of the circular tunnel increased continuously with the vertical height, while the smoke temperature of the rectangular section increased at first and then tends to be stable. Nevertheless, the maximum temperature of smoke in circular and rectangular tunnels appeared at the top of the tunnel. Therefore, it is desirable to place the heat and smoke detectors at the top of the tunnel.
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