Computational investigation of flame extension height for horizontally oriented rectangular source jet fires impinging on a vertical plate

Abstract

SummaryThis paper investigates the flame extension height induced by a horizontally oriented rectangular source fire impinging on a vertical plate, which has rarely been reported in literature. Focusing on the scenarios with nonimpinging flame lengths that are comparable with or larger than the plate‐source distance, a series of numerical experiments were conducted, in which the exit velocities varied from 27.5 to 125 m/s and the orifice aspect ratios ranged from 1 to 4. Results show that the flame extension height increases with increasing exit velocity and becomes larger with increasing orifice aspect ratio at a given fuel exit velocity. New correlations are proposed to predict the flame extension height based on the unburnt fuel after impinging, assuming a kite flame shape of circular and elliptical cross section. Moreover, the new proposed correlations provide a general and practical basis for estimating the flame extension height of horizontally oriented rectangular source impinging jet fires.