LAUSR

Abstract The present study investigated the temperature profile of impingement flow along the corner between the wall and the inclined ceiling induced by wall-attached gaseous fuel jet flame, which had not been quantified in the literature. Experiments were carried out by using a square nozzle as the burner for various heat release rates, burner-ceiling heights and ceiling inclination angles, with overall 169 experimental conditions considered comprehensively. Results showed that the temperature rise decreased with the increase in inclination angle of the ceiling. It decreased faster along the corner with positive ceiling inclination than that with the negative ceiling inclination. For a negative angle of the ceiling, the inclination angle had more significant effect on the temperature profile with the decreasing of heat release rates and increasing of ceiling heights. While as the inclination angles of the ceiling were positive, it had more significant effect on the temperature profile with the increasing of heat release rates and decreasing of ceiling heights. These behaviors were interpreted based on the analysis on the effects of the rotating vortices of impingement flows in the corner and the buoyancy component along the inclined ceiling. The model proposed by Oka could describe the profile of positive inclination angles well. A new model was developed to correlate the temperature profiles in general for various ceiling inclinations, where the total flame length was found to be the characteristic length scale.