文档介绍：Applied Mathematical Modelling 22 (1998) 113±136
Laminar ¯amelet modelling of turbulent bustion
. Benim a,*, . Syed b
a Fachbereich Maschinenbau und Verfahrenstechnik, Fachhochschule Dusseldorf, Josef-Gockeln-Str. 9,
D-40474 Dusseldorf, Germany
b ABB Power Generation Ltd., Combustor Development Department, CH-5401 Baden, Switzerland
Received 22 April 1997; received in revised form 15 October 1997; accepted 18 December 1997
Abstract
Laminar ¯amelet method (LFM) based prediction procedures for turbulent bustion are presented.
Two dierent approaches are investigated. In one case, the standard eddy dissipation concept (EDC) is used as the tur-
bustion model and the laminar ¯amelet model is applied as a post-processor for subsequent nitrogen oxide
predictions. In the second approach, however, a higher predictive potential is achieved by employing the LFM as the
bustion model. Predictions pared with experiments for two dierent turbulent premixed ¯ame
con®gurations, namely for an essentially parabolic, laboratory ¯ame, and a strongly swirling, recirculating ¯ame of
an industrial gas turbine burner. Results show that a substantial increase of predictive pared to more
traditional methods is achieved by the ¯amelet method, not only for laboratory ¯ames, but also for practical gas tur-
bine applications. For the latter, the classical order of magnitude analysis suggests that bustion occurs outside
the laminar ¯amelet regime. Despite this, laminar ¯amelet predictions show relatively good agreement with experimen-
tal data, supporting arguments that such modelling is approppriate beyond the classical laminar ¯bustion
limits de®ned in the Borghi diagram. Ó 1998 Elsevier Science Inc. All rights reserved.
Keywords: Turbulent premixed ¯ames; Combustion modelling; Laminar ¯amelet method
1. Introduction
In the ®eld of industrial gas turbines, the use of lean bustion systems has led to
very low emissions via lowered ¯ame temperatures. However, th