Modeling of complex premixed burner systems using Flamelet-Generated Manifolds

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Abstract

The numerical modeling of realistic burner systems puts a very high demand in calculational resources. The calculational cost of combustion simulations can be reduced by reduction methods, which simplify the chemical kinetics. A recently developed reduction method called Flamelet-Generated Manifold method was applied to laminar flames in premixed combustion systems. The reduced mechanism consisted of a manifold, which was created utilizing one-dimensional flamelet equations as steady-state relations. In a pre-processing step these flamelet equations were solved and the solutions were stored in a database, which could be linked to a CFD code at run-time. A manifold was constructed for a methane/air mixture with two controlling variables: one progress variable and the enthalpy to account for energy losses. This manifold was utilized for the computation of a two-dimensional burner-stabilized flame and the results were compared with results of detailed computations. These two controlling variables were sufficient to reproduce the results of detailed calculations. The effect of flame stretch on the accuracy of the method was studied by simulating strained flames in stagnation-point flows. The main effect of flame stretch on the mass burning rate was due to the usage of only one controlling variable. Extra controlling variables can be added to increase the accuracy of the method extra controlling variables. The calculation time can decrease by a factor of 20 when a flamelet-generated manifold is applied. The flamelet-generated manifold method was an efficient tool to model combustion in realistic furnaces. The model will be utilized to investigate the performance and stability of ceramic foam burners in high temperature systems, where the risk of flashback was enlarged. Original is an abstract.

Original languageEnglish
Title of host publicationAbstracts of symposium papers 28th International Symposium on Combustion : University of Edinburgh, Scotland, July 30 - August 4, 2000
PublisherCombustion Institute
Pages163
Number of pages1
Publication statusPublished - 1 Jan 2000
Event28th International Symposium on Combustion - Edinburgh, United Kingdom
Duration: 30 Jul 20004 Aug 2000

Conference

Conference28th International Symposium on Combustion
CountryUnited Kingdom
CityEdinburgh
Period30/07/004/08/00

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