Experimental investigation on lateral ceiling temperature distribution induced by wall-attached fire with various burner aspect ratios in underground space

The lateral ceiling temperature distribution induced by wall-attached fires with various burner aspect ratios in underground space have been experimentally investigated with a specially designed test rig of 1:8 scale. A series of tests were conducted with rectangular gas burners with different aspect ratios set close to the side wall, different fire heat release rates and fire source-ceiling height. The ceiling temperature profile and lateral ceiling flame extension length under the ceiling were recorded and analyzed in detail. The results show that the lateral ceiling temperature distribution induced by rectangular burners with different aspect ratios is quite different. The temperature for a given horizontal location in the lateral direction below the ceiling increases with the increase of the burner aspect ratio. A new correlation is proposed with modified characteristic diameter. Its predictions are in reasonably good agreement with the present measurements as well the previous measurements of the others which were not used in its derivation.

Automated summary

The lateral ceiling temperature distribution induced by wall-attached fires with various burner aspect ratios in underground spaces was experimentally investigated. Different aspect ratios of rectangular gas burners were found to result in varying lateral ceiling temperature distributions, with an increase in burner aspect ratio leading to higher temperatures at specific locations below the ceiling.