Abstract: In order to study the temperature distribution of the linear fire source in the pipe gallery at different lateral positions, this paper sets the linear fire source at the lateral positions of 0, 20, 40 and 60 cm from the center of the pipe gallery. The study found that the longitudinal temperature of each working condition increased first, then decreased and then increased with time. The highest temperature rise first decreases and then rises during the increase in the lateral distance of the linear fire source from the center, and the time to reach the highest temperature also increases first and then decreases. The arc-shaped tube wall has an influence on the fire source combustion. The angle in the vertical direction of each working condition at the cross section of 0 m from the center of the pipe gallery reached the highest temperature rise. In the cross section of 0.5 m transverse section, the angle corresponding to the highest temperature rise of each working condition is 15°. When the lateral distance between the fire source and the center of the pipe gallery increases, the temperature rise gap between −45° and 45° increases. 

Key words: integrated pipe gallery, linear fire source; reduced-size model;longitudinal temperature field;transverse temperature field