4.7 Article

Flame extension length and temperature profile in thermal impinging flow of buoyant round jet upon a horizontal plate

Journal

APPLIED THERMAL ENGINEERING
Volume 73, Issue 1, Pages 15-22

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2014.07.016

Keywords

Thermal impinging flow; Flame extension length; Temperature profile; Axisymmetric buoyant round jet; Heat power

Funding

  1. National Nature Science Funds of China
  2. National Basic Research Program of China [2012CB719702]
  3. Fundamental Research Funds for the Central Universities and Innovation engineering project of BJAST [PXM2014-178215-000003]

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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.

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