A flamelet generated manifolds lookup table tool for premixed
turbulent combustion
Citation for published version (APA):
Fancello, A., Bastiaans, R. J. M., & Goey, de, L. P. H. (2012). A flamelet generated manifolds lookup table tool for premixed turbulent combustion. In Paper presented at the 7th OpenFOAM Workshop, 25-28 June 2012, Darmstadt, Germany Technische Universität Darmstadt.
Document status and date: Published: 01/01/2012 Document Version:
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7thOpenFOAMR Workshop Center of Smart Interfaces, Technische Universit¨at Darmstadt, Germany
25 – 28 June 2012
A Flamelet Generated Manifolds lookupTable tool for premixed
turbulent combustion
A. Fancello ‡, R.J.M. Bastiaans, and L.P.H. de Goey
TU/e Eindhoven University of Technology Mechanical Engineering Dept.
-Combustion Technology - Eindhoven - The Netherlands
March 27, 2012
Turbulent Combustion, Flamelet Generated Manifold, IGCC, Hydrogen
1
Introduction
TheH2−IGCC [1] project is promoted under the supervision of the Gas Turbine Network and includes many European partners, either from the university and industrial field. Its overall objective is to provide and demonstrate technical solutions which will allow the use of state-of-the-art highly efficient, reliable gas turbines in the next generation of IGCC plants. TU Eindhoven is involved in the first subproject (SP1) which regards the Combustion part. The idea of using an open source tool [2] such as Open FOAM comes from the highly demanding costs referred to the supercomputers simulations, considering that a commercial software licence can become quite expensive, especially when parallel simulations are performed.
The combustion method of Flamelet Generated Manifolds [3] [4] has been created in TU Eind-hoven and its purpose is the modeling of the chemistry in the combustion simulations. In a detailed chemistry problem, for each chemical species involved in the reaction, an equation has to be solved and this results in a very stiff partial differential equations system, mainly due to the broad range of time scales. Another drawback of the detailed chemistry is the non linear coupling between equations by hundreds of chemical reactions and, as a consequence of this problem, the CPU effort which is required in the numerical simulations becomes prohibitive. The FGM reduced method has become a proper solution in order to overcome these mentioned problems. Its basic idea is to consider a multidimensional flame as a set of many 1D flames called flamelets. The conservation equations for a premixed flame are adapted in terms of con-trolling VariablesYi . The Manifolds is built in the way that mixture composition is described by small number of controlling variablesCV . Flamelet equations is obtained considering the conservation equations for a premixed flame in a system adapted to iso-surfaces of the progress
‡Corresponding Author: Alessio Fancello (a.fancello@tue.nl)
variableYi. The set of equations is solved treating it as an adiabatic premixed flat flame. The tables for the controlling variables and the other parameters are obtained using the detailed chemistry code developed in the TU/e known as CHEM1D [5]. The solution of the problem (flamelet) forms a 1D curve in composition space Y i(s). During the pre-processing part, the manifold is computed and the variables which are needed to solve the conservation equations (CV1, ..., CVn) are stored in a database. The CFD code solves the flow field equations and equations for controlling variables (i.e.Y and h ). From the available literature regarding the validation of this method, in particular with the inclusion of hydrogen effects [7], it has been proved that FGM is able to reach a reasonable accuracy compared with the detailed chemistry one, just with a CPU time which is two order lower than the one required for the detailed chemistry.
2
Implementation of the problem in Open FOAM
A 1D manifold for the reaction progress variable, using the relatively simple gas such as methane, has been developed using the library interpolationTable which is used to read and store values with a linear interpolator. The case file used is a 2D geometry flame in a box with a stabilized methane flame. The 1D manifold consists on a progress variable and its source term. [6]. As a further step, a 2D Manifold table reader library is used to include also a second controlling variable such as heat loss. A modified version of the solver rhoPimpleFoam has been adapted for the purpose of this study. The implementation of the table to increase the order of the lookup variables is a current work in progress, in order to include the turbulence effects and the hydrogen addiction in the fuel.
References
[1] http://http://www.h2-igcc.eu/. [2] http://www.openfoam.com.
[3] de Goey L.P.H. & ten Thije Boonkkamp J.H.M., A Flamelet Description of Premixed Laminar Flames and the Relation with Flame Stretch. Combust. Flame.119(3), 253–271. (1999)
[4] J.A. van Oijen, L.P.H. de Goey, Modelling of premixed counterflow flames using the flamelet-generated manifold method. Combust. Theory Modelling, 6(3), 463-478, (2002) [5] http://www.combustion.tue.nl/chem1d.
[6] J.A. van Oijen, L.P.H. de Goey, Modelling of premixed laminar flames using flamelet-generated manifolds, Combust. Sci. and Tech., 161, 113-137, (2000)
[7] J.A.M. de Swart, R.J.M. Bastiaans, J.A. van Oijen, L.P.H. de Goey, R.S. Cant, Inclusion of preferential diffusion in simulations of premixed combustion of hydrogen/methane mix-tures with flamelet generated manifolds., Flow, Turbulence and Combustion, 85, 473-511, (2010)
