摘要：Utility tunnels are widely built in many cities.When an unexpected fire occurs in the electrical compartment ofutility tunnel, the smoke temperature below the utility tunnelceiling is one of the most important factors for thermal detectionand alarm. In this paper, the smoke temperature distributionunder the longitudinal ventilation in a utility tunnel fire accidentis studied by combining experiment and numerical simulation.The main purpose of this paper is to study the smoketemperature distribution below the ceiling under the effect oflongitudinal ventilation in a utility tunnel, and provide guidancefor the installation of detector in case of fire. In addition, threeimportant factors such as ventilation velocity, heat release rateand vertical position of fire source are considered respectively.The thermocouple trees are used to measure the temperaturealong the longitudinal direction of utility tunnel. Results showthat the maximum temperature of the utility tunnel is directlyabove the fire source without longitudinal ventilation. What’smore, with the ventilation velocity increases, the maximumtemperature below the ceiling gradually moves to thedownstream of the fire source in utility tunnel. Finally, a newcorrelation formula is proposed to predict the temperaturedistribution of smoke in utility tunnels on the basis of theoreticalanalysis. The longitudinal temperature distribution obtained bynumerical simulation is in good agreement with theexperimental tests. Therefore, the research in this paper ishelpful to prevent utility tunnel fire and reduce people'sproperty loss.
关键词：Experimental study; Temperature distribution;
utility tunnel; Ventilation
