Investigation on temperature distribution under the coupling action of transverse position and fire sealing of linear fire in tunnel

By sealing the portal at one end of tunnel and changing transverse location linear fire source in tunnel, hot smoke layer, longitudinal temperature distribution maximum were investigated. It is found that flame will bend under influence curved ceiling layer be thicker when approaches to side wall. The variation law heat release rate analyzed by considering limiting effect wall thermal feedback. modifying previous formula effective height, an empirical for predicting sources with different aspect ratios proposed, ventilation coefficient obtained characterized without sealing. Moreover, accuracy predicted verified using coefficient. Based on dimensional analysis, it's concluded mainly depends rate, proposed predict rise several positions. error values actual within 13%.