Künne,Guido

Development of numerical methods for the simulation of turbulent premixed combustion

This work considers the simulation of technical combustion systems, in detail the Large Eddy Simulation (LES) of premixed flames. With regard to the pollutant reduction of current devices (e.g. gas turbines and aero engines) as well as complementary technologies in the context of renewable energies (e.g. ensure base load, biofuels, synthetic fuels), this type of flames is of increasing importance. Unfortunately, unsteady phenomena like flashback and thermo acoustic instabilities are known to appear prevalently within these premixed flames making them more difficult to control. At this the simulation can provide detailed insight into the physical processes for scientific research as well as help in the design of combustors in an industrial environment.

Method and Theory

Within LES the large scale flow structures which are resolved by the computational cell size are explicitly computed whilst the subgrid part gets modeled. As shown in numerous publications this approach is very accurate in complex geometries and has been successfully applied to non-reacting flows in the past. Also in the context of combustion simulations this technique is considered as a very promising approach. Unfortunately a splitting of scales which represent the turbulent energy cascade of the velocity field is not possible for the chemistry since it occurs completely below the cell size.

Within premixed combustion the reactants (fuel and oxidizer) are already mixed before entering the combustor. After ignition there exists a sharp flame front which can be viewed as an interface separating the burnt from the fresh gases. This interface propagates into the fresh gas with a characteristic velocity, termed the flame speed.  Since it determines the flame position and therewith the temperature distribution and the corresponding thermal load, this speed is the most decisive parameter and needs to be reproduced by the simulation. However, the exact rate of fuel consumption is determined by complex chemical mechanisms which cannot be described in a three-dimensional simulation due to the high computational effort.

Therefore, the two approaches of chemistry tabulation and artificial flame thickening are combined within this work. As illustrated in Fig.1, the technique of flamelet generated manifolds is employed for the chemistry tabulation where the flame structure obtained by a one-dimensional detailed chemistry simulation gets mapped onto a reaction progress variable with additional table dimensions to account for different mixture compositions or heat losses. As given on the right, by that, the LES-code can reproduce the flame propagation with a high accuracy whilst only these mapping parameters must be computed instead of the full reaction kinetics.

However, the spatial resolution requirements for this proper coupling (gird size of 0.1mm) are still too high for the simulation of complex geometries. As illustrated in Fig.2, the approximation of the chemical source term as it is required to obtain the flame propagation, may induce large errors when using LES-typical mesh sizes (1mm). Therefore, artificial thickening is applied which adaptively ensures a sufficient resolution and therewith the correct flame speed on arbitrary meshes.

Fig.2 Numerical approximation for the integration of the chemical source term (left) and the resulting error in the temporal evolution of the flame speed (middle). Right: grid dependency of the flames speed for two different reactant velocities (uu) showing the unphysical spreading without thickening and the correct value for the adaptively thickened flame.
Fig.2 Numerical approximation for the integration of the chemical source term (left) and the resulting error in the temporal evolution of the flame speed (middle). Right: grid dependency of the flames speed for two different reactant velocities (uu) showing the unphysical spreading without thickening and the correct value for the adaptively thickened flame.

Proceeding

Besides one- and two-dimensional test cases which serve for numerical verification, the method is applied to three-dimensional reacting turbulent flows to test its applicability to realistic burners. As given in Fig.3, three configurations which feature a lean premixed flame are considered.

Fig.3 Isosurface of the chemical source term to mark the reaction zone of the three applications considered. Right: temperature field of a swirling flame stabilized by the recirculation of hot products. Middle: equivalence ratio to illustrate the stratified burning imposed by strong variations in the fuel to air ratio. Right: flame during its upstream movement into the region of fuel preparation
Fig.3 Isosurface of the chemical source term to mark the reaction zone of the three applications considered. Right: temperature field of a swirling flame stabilized by the recirculation of hot products. Middle: equivalence ratio to illustrate the stratified burning imposed by strong variations in the fuel to air ratio. Right: flame during its upstream movement into the region of fuel preparation

These cover the phenomena of swirl stabilization, fuel stratification and flame flashback which are of practical relevance. At this the simulation is able to predict the experimentally determined velocity and temperature field for the swirled and stratified flame with a very good accuracy. Furthermore the simulation results are used to obtain important knowledge about the interaction of the flame with the mixing layer leading to different reaction paths in the stratified flame. Also for the third configuration which considers the undesired flame propagation as it is critical for save operating conditions, first satisfying results are obtained. At this, important physical processes of the phenomenon can be observed in the simulation which contributes to improve its understanding.

Publikationen

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Number of items: 32.

2019

Dressler, L. ; Ries, F. ; Kuenne, G. ; Janicka, J. ; Sadiki, A. (2019):
Analysis of Shear Effects on Mixing and Reaction Layers in Premixed Turbulent Stratified Flames using LES coupled to Tabulated Chemistry.
In: Combustion Science and Technology, Taylor & Francis, S. 1-16, 2019, ISSN 1563-521X,
DOI: 10.1080/00102202.2019.1678915,
[Online-Edition: https://doi.org/10.1080/00102202.2019.1678915],
[Article]

Popp, S. ; Kuenne, G. ; Janicka, J. ; Hasse, C. (2019):
An extended artificial thickening approach for strained premixed flames.
In: Combustion and Flame, Elsevier, S. 252-265, 206, ISSN 0010-2180,
DOI: 10.1016/j.combustflame.2019.04.047,
[Online-Edition: https://doi.org/10.1016/j.combustflame.2019.04.047],
[Article]

Knappstein, R. ; Kuenne, G. ; Nicolai, H. ; di Mare, F. ; Sadiki, A. ; Janicka, J. (2019):
Description of the char conversion process in coal combustion based on premixed FGM chemistry.
In: Fuel, S. 124-134, 236, ISSN 00162361,
DOI: 10.1016/j.fuel.2018.08.158,
[Online-Edition: https://doi.org/10.1016/j.fuel.2018.08.158],
[Article]

Han, W. ; Wang, H. ; Kuenne, G. ; Hawkes, E. ; Chen, J. ; Janicka, J. ; Hasse, C. (2019):
Large eddy simulation/dynamic thickened flame modeling of a high Karlovitz number turbulent premixed jet flame.
In: Proceedings of the Combustion Institute, S. 2555-2563, 37, (2), DOI: 10.1016/j.proci.2018.06.228,
[Article]

2018

Heinrich, A. ; Ries, F. ; Kuenne, G. ; Ganter, S. ; Hasse, C. ; Sadiki, A. ; Janicka, J. (2018):
Large Eddy Simulation with tabulated chemistry of an experimental sidewall quenching burner.
In: International Journal of Heat and Fluid Flow, S. 95-110, 71, ISSN 0142727X,
DOI: 10.1016/j.ijheatfluidflow.2018.03.011,
[Online-Edition: https://doi.org/10.1016/j.ijheatfluidflow.2018.03.011],
[Article]

Han, W. ; Wang, H. ; Kuenne, G. ; Hawkes, E. ; Chen, J.H. ; Janicka, J. ; Hasse, C. (2018):
Large eddy simulation/dynamic thickened flame modeling of a high Karlovitz number turbulent premixed jet flame.
In: Proceedings of the Combustion Institute, (accepted for oral presentation), [Conference item]

Heinrich, A. ; Ganter, S. ; Kuenne, G. ; Jainski, C. ; Dreizler, A. ; Janicka, J. (2018):
3D Numerical Simulation of a Laminar Experimental SWQ Burner with Tabulated Chemistry.
In: Flow Turbulence and Combustion, Springer, S. 535-559, 100, (2), ISSN 1386-6184,
DOI: 10.1007/s10494-017-9851-9,
[Article]

2017

Yildar, E. ; Kuenne, G. ; He, C. ; Schiessl, R. ; Benzinger, M. S. ; Neurohr, M. ; di Mare, F. ; Sadiki, A. ; Janicka, J. (2017):
Understanding the Influences of Thermal and Mixture Inhomogeneities on the Auto-Ignition Process in a Controlled Auto-Ignition (CAI) Engine Using LES.
In: Oil & Gas Science and Technology, Revue d’IFP Energies nouvelles, 72, (6), [Article]

Ganter, S. ; Meier, Thorsten ; Heinrich, A. ; Kuenne, G. ; Janicka, J. (2017):
Simulation of near-wall Combustion Suitability of simple Chemistry Tabulation and Analysis by means of a detailed Kinetics.
In: VDI Energie & Umwelt 2017 – 28 Deutscher Flammentag, Darmstadt, In: 28th Conference on German Flame Day Combustion and Fire, 2302, [Conference item]

Knappstein, R. ; Kuenne, G. ; Sadiki, A. ; Janicka, J. (2017):
Flamelet-Tabulation in the Context of Simulation of Pulverized Coal Combustion.
In: VDI Energie & Umwelt 2017 – 28 Deutscher Flammentag, Darmstadt, In: 28th Conference on German Flame Day Combustion and Fire, [Conference item]

Knappstein, R. ; Kuenne, G. ; Meier, T. ; Sadiki, A. ; Janicka, J. (2017):
Evaluation of coal particle volatiles reaction by using detailed kinetics and FGM tabulated chemistry.
In: Fuel, S. 39-52, 201, ISSN 00162361,
[Online-Edition: https://doi.org/10.1016/j.fuel.2016.10.033],
[Article]

2016

Avdic, A. ; Kuenne, G. ; Janicka, J. (2016):
Flow Physics of a Bluff-Body Swirl Stabilized Flame and their Prediction by Means of a Joint Eulerian Stochastic Field and Tabulated Chemistry Approach.
In: Flow Turbulence and Combustion, S. 1185-1210, 97, (4), ISSN 1386-6184,
[Online-Edition: http://dx.doi.org/10.1007/s10494-016-9781-y],
[Article]

Buhl, S. ; Coelho, P. J. ; Cuenot, B. ; Dauptain, A. ; Dinkelacker, F. ; Domingo, P. ; Duchaine, F. ; Gicquel, L. Y. M. ; Hartmann, F. ; Hasse, C. ; Keller, P. ; Kempf, A. ; Kuenne, G. ; Maas, U. ; Mancini, M. ; d. Mare, F. ; Nishad, K. ; Pfitzner, M. ; Poinsot, T. ; Riber, E. ; Roekaerts, D. J. E. M. ; Sadiki, A. ; Staffelbach, G. ; Thévenin, D. ; Vermorel, O. ; Vervisch, L.
Vervisch, Luc ; Roekaerts, Dirk (Hrsg.) (2016):
Computational Fluid Dynamics of Turbulent Combustion.
London, ERCOFTAC, ISBN 978-0-9955779-0-9,
[Book]

2015

Fiorina, B. ; Mercier, R. ; Kuenne, G. ; Ketelheun, Anja ; Avdic, Amer ; Janicka, J. ; Geyer, D. ; Dreizler, A. ; Alenius, E. ; Duwig, C. ; Trisjono, P. ; Kleinheinz, K. ; Kang, S. ; Pitsch, H. ; Proch, F. ; Marincola, F. Cavallo ; Kempf, A. (2015):
Challenging modeling strategies for LES of non-adiabatic turbulent stratified combustion.
In: Combustion and Flame, S. 4264-4282, 162, (11), ISSN 0010-2180,
[Online-Edition: http://dx.doi.org/10.1016/j.combustflame.2015.07.036],
[Article]

2014

Avdic, Amer ; Kuenne, G. ; Ketelheun, Anja ; Sadiki, A. ; Jakirlić, Suad ; Janicka, J. (2014):
High performance computing of the Darmstadt stratified burner by means of large eddy simulation and a joint ATF-FGM approach.
In: Computing and Visualization in Science, Springer Berlin Heidelberg, S. 77-88, 16, (2), ISSN 1432-9360,
[Online-Edition: http://dx.doi.org/10.1007/s00791-014-0225-8],
[Article]

Kuenne, G. ; Euler, M. ; Ketelheun, Anja ; Avdic, Amer ; Dreizler, A. ; Janicka, J. (2014):
Effect of thermal boundary conditions onto the flame stabilization of a turbulent premixed stratified flame.
In: Proceedings of the Twelfth International Workshop on Measurement and Computation of Turbulent (non) Premixed flames, Pleasanton, USA, [Conference item]

He, C. ; Yildar, Esra ; Kuenne, G. ; di Mare, F. ; Sadiki, A. ; Janicka, J. (2014):
LES of a spark ignition engine using artificial thickening and flamelet generated manifolds.
In: LES for Internal Combustion Engine Flows (LES4ICE conference), Rueil-Malmaison, France, [Conference item]

2013

Kuenne, G. ; Aschmoneit, Kai ; Ketelheun, Anja ; Janicka, J. (2013):
Large Eddy Simulation of Swirl Stabilized Lean Premixed Combustion Using Structured and Unstructured Solvers.
In: SIAM International Conference on Numerical Combustion, San Antonio, USA, [Conference item]

Avdic, Amer ; Kuenne, G. ; Ketelheun, Anja ; Sadiki, A. ; Janicka, J. (2013):
Studying the impact of shear onto the mixing processes of a turbulent stratified flame by means of Large Eddy Simulation.
In: SIAM International Conference on Numerical Combustion, San Antonio, USA, [Conference item]

Avdic, Amer ; Kuenne, G. ; Ketelheun, Anja ; Sadiki, A. ; Janicka, J. (2013):
Large Eddy Simulation of a Lean Stratified Flame Exposed to Different Shear Conditions in the Upstream Mixing Layer.
In: Proceedings of the European Combustion Meeting, Lund, Sweden, [Conference item]

Meier, T. ; Kuenne, G. ; Ketelheun, Anja ; Janicka, J. (2013):
Numerische Abbildung von Verbrennungsprozessen mit Hilfe detaillierter und tabellierter Chemie.
In: VDI Berichte, S. 643-652, [Book section]

Janicka, J. ; Kühne, J. ; Kuenne, G. ; Ketelheun, Anja
Janicka, J. ; Sadiki, A. ; Schäfer, M. ; Heeger, C. (Hrsg.) (2013):
Large Eddy Simulation of Combustion Systems at Gas Turbine Conditions.
In: Flow and Combustion in Advanced Gas Turbine Combustors - Fluid Mechanics and Its Application, S. 183-204, [Book section]

2012

Kuenne, G. ; Seffrin, F. ; Fuest, F. ; Stahler, T. ; Ketelheun, Anja ; Geyer, D. ; Janicka, J. ; Dreizler, A. (2012):
Experimental and numerical analysis of a lean premixed tratified burner using 1D Raman/Rayleigh scattering and Large Eddy Simulation.
In: Combustion and Flame, S. 2669-2689, 159, (8), [Article]

Avdic, Amer ; Kuenne, G. ; Ketelheun, Anja ; Sadiki, A. ; Janicka, J. (2012):
High Performance Computing of the Stratified Burner by means of Large Eddy Simulation and a joint ATF – FGM models.
In: European Multigrid Conference 2012, Schwetzingen, Germany, [Conference item]

Kuenne, G. ; Ketelheun, Anja ; Avdic, Amer ; Sadiki, A. ; Janicka, J. (2012):
Investigation of heat loss effects within the Darmstadt Stratified Burner by means of Large Eddy Simulation and a joint ATF-FGM approach.
In: Eleventh International Workshop on Measurement and Computation of Turbulent (non) Premixed flames, Darmstadt, Germany., [Conference item]

2011

Kuenne, G. ; Ketelheun, Anja ; Janicka, J. (2011):
LES modeling of premixed combustion using a thickened flame approach coupled with FGM tabulated chemistry.
In: Combustion and Flame, S. 1750-1767, 158, [Article]

Aschmoneit, Kai ; Kuenne, G. ; Baumann, M. ; Janicka, J. (2011):
Large Eddy Simulations of Swirling Flow with Commercial and Academic CFD Software.
In: 13th International Conference on Numerical Combustion, Corfu, Greece, [Conference item]

Kuenne, G. ; Ketelheun, Anja ; Janicka, J. (2011):
Assessment of Isothermal and Reacting LES when Applied to a New Premixed Stratified Burner.
In: Proceedings of the European Combustion Meeting 2011, Cardiff, UK, [Conference item]

Aschmoneit, Kai ; Kuenne, G. ; Janicka, J. (2011):
Sensitivity Studies of Large Eddy Simulations of Combustion Systems with an Unstructured Implicit Solver, Proceedings in Applied Mathematics and Mechanics, December, 2011, Vol. 11, Issue 1, 595-596.
In: Proceedings in Applied Mathematics and Mechanics, S. 595-596, 11, (1), [Article]

Aschmoneit, Kai ; Kuenne, G. ; Janicka, J.
Brenn, G. ; Holzapfel, G. A. ; Schanz, M. ; Steinbach, O. (Hrsg.) (2011):
Sensitivity Studies of Large Eddy Simulations of Combustion Systems with an Unstructured Implicit Solver.
In: Special Issue: 82nd Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), S. 595-596, [Online-Edition: http://dx.doi.org/10.1002/pamm.201110287],
[Book section]

2009

Kuenne, G. ; Klewer, C. ; Janicka, J. (2009):
Hybrid RANS/LES Simulation of a Lean Premixed Swirl Burner Based on a Turbulent Flame Speed Closure.
In: ASME Turbo Expo, Orlando, Florida, USA, 0, (GT2009), [Article]

2008

Hahn, F. ; Olbricht, C. ; Klewer, C. ; Kuenne, G. ; Ohnutek, R. ; Janicka, J. (2008):
Investigation of Complex Swirling Flows Using Commercial and Academic CFD Programs.
Reykjavik, Iceland, 0, [Conference item]

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