The influence of distance between two fire sources, aspect ratios and hear release rates on the temperature distribution on the centerline of the two fire sources were experimentally studied. Propane burners were used to simulate the fire sources. The distances between two fire sources were 0.2 m, 0.4 m and 0.6 m, and the aspect ratio of fire sources were 1, 3 and 6. The results show that the longitudinal temperature profile on the ground centerline induced by two fire sources decreases exponentially. When other conditions are the same, with the increase of distance of fire sources, the temperature at the same position on the centerline near the fire source decreases gradually, while the temperature at the same position on far field of fire source is basically unchanged. The effect of aspect ratio of fire source on the temperature on the centerline of two fire sources is not monotonous. Based on the dimensional analysis method, an empirical correlation on the centerline temperature profile which relates to fire source spacing, aspect ratio and heat release rate is established. Predictions the proposed correlation agree reasonably with experimental data.

double fire, temperature decay, distance between two fire sources, aspect ratio, experimental study