Abstract: In order to study the characteristic law of heat flow field after the cable fire in narrow and long space, the mathematical model of fire simulation calculation suitable for narrow and long space was established. The governing equations were deformed and discretized, and solved by numerical program. The characteristic law of smoke spread after the cable fire, the distribution of temperature field at different time and the temperature measuring point at characteristic position were obtained. The influence of ventilation on fire heat flow field was discussed. The change law of fire flow field characteristics provides references for the design of fire detection and ventilation of long and narrow space.

Key words: ventilation, long and narrow space, cable fire；numerical simulation