Abstract
Experiments were performed to investigate the effects of the shape and size of a fire source on fire properties using a tunnel model with a rectangular cross section and aspect ratio of 1:2. Square and rectangular burners were used as the model fire sources. The variations in the heat release rate (HRR) from 4.5 to 36 kW was proportional to the fire size, and the longitudinal ventilation velocity was also varied in the range from 0 to 0.8 m/s. The flame tilt angle, maximum temperature rise of the smoke layer near the ceiling and its position were adopted as the variables that characterise the fire phenomena in the near field of a fire source in the presence of longitudinal ventilation. New empirical formulae considering the effects of the shape and size of a fire source on these variables were developed.
