Temperature profile beneath an inclined ceiling induced by plume impingement of gas fuel jet flame

Temperature profile of thermal impingement flow beneath sloped ceiling induced by non-isotropic gaseous fuel jet flame has not been studied before and therefore no data are available in the literatures. Experiments were carried out in this work to measure the temperature distribution in both upward and downward directions beneath the inclined ceiling induced by gaseous fuel jet flame. Different inclination angles, various heat release rates and diverse source-plate heights were considered. Results show that the influence of inclination angle has opposite impacts on the temperature rise for upward flow and downward flow respectively and burner dimension has little effect on the temperature attenuation characteristics while the inclined direction is perpendicular to long side of fire source. The experimental data were compared with correlations predicted by predecessors' researches and it was observed that the experiment data of upward were consistent with the former correlations while an apparent discrepancy can be found along the downward direction. The influence of buoyancy component force parallel to inclined ceiling was discussed and simply reflected by the cosine value of inclination angle. New relatively uniform correlations were proposed to predict the temperature decay profiles by combing the effects of heat release rates, inclination angles and source-ceiling heights.