X. C. Zhang, L. H. Hu, W. Zhu, X. L. Zhang and L. Z. Yang (2014) Flame extension length and temperature profile in thermal impinging flow of buoyant round jet upon a horizontal plate. Journal/Applied Thermal Engineering 73 15-22. [In English]
Web link: http://dx.doi.org/10.1016/j.applthermaleng.2014.07.016
Keywords: Thermal impinging flow; Flame extension length; Temperature profile; Axisymmetric buoyant round jet; Heat power; HEAT-TRANSFER; CHARACTERISTICS; NOZZLE GEOMETRY; FIRE PLUMES; AIR-JET; IMPINGEMENT; BEHAVIOR; PROBE; ARRAY

Abstract: This paper investigates the flame extension length and temperature profile in a thermal impinging flow, induced by a buoyant turbulent round jet impingement upon a horizontal plate, focusing on the scenarios that flame heights are comparable to or larger than plate-source height. Results show that the measured flame extension lengths in this work with a wider range [(H-f-H)/D from 0 to 14.5] can be still well approached by the You and Faeth's correlation obtained from limited data range [(H-f-H)/D from 0 to 5.8]. New correlations to predict the flame extension length are also developed based on physically the unburnt fuel (at impingement) estimation with cylindrical- or ellipse flame shape hypothesis. The change of maximum temperature at the impingement zone along with plate-source height is found to be well described by a three-regime law. A new correlation is proposed, with modified characteristic plume radius, to collapse the horizontal temperature decay profile with H-f/H up to 4.13. (C) 2014 Elsevier Ltd. All rights reserved.