Turbulent combustion modelling of a confined premixed jet flame including heat loss effects using tabulated chemistry

Gövert, Simon; Mira, Daniel; Kok, Jacobus B.W.; Vázquez, Mariano; Houzeaux, Guillaume

doi:10.1016/j.apenergy.2015.06.031

Cited by 30 publications

(42 citation statements)

References 34 publications

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“…The composed species mass fraction Y c , sometimes also referred to as the unscaled progress variable, is defined as a linear combination of species mass fractions Y k : where the weighting coefficients b k describe the contribution of each species k to the composed mass fraction Y c [3]. For premixed conditions, the composed species mass fraction is commonly normalized using the initial and equilibrium conditions.…”

Section: Modeling Approachmentioning

confidence: 99%

“…The maximum enthalpy value is determined based on the solution of a freely propagating flame configuration while the minimum enthalpy level for the tabulation is based on a vanishing source term. Consequently, if the enthalpy level is lower than h m i n , the reaction chemistry remains frozen [3]. …”

Section: Modeling Approachmentioning

confidence: 99%

“…The model is implemented in a low-Mach number flow solver that is specifically designed for large-scale parallel applications and based on the Finite Element Method (FEM). While the proposed combustion model has already been successfully applied to predict the flow field of a confined premixed jet flame [3], it is now extended to account for non-premixed and partially premixed conditions. While diffusion flames will be addressed in the future, a technically premixed swirl combustor is analyzed in this work as a first validation step.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Partial Premixing and Heat Loss on the Reacting Flow Field Prediction of a Swirl Stabilized Gas Turbine Model Combustor

Gövert

Mira

Kok

et al. 2017

Flow Turbulence Combust

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This work addresses the prediction of the reacting flow field in a swirl stabilized gas turbine model combustor using large-eddy simulation. The modeling of the combustion chemistry is based on laminar premixed flamelets and the effect of turbulence-chemistry interaction is considered by a presumed shape probability density function. The prediction capabilities of the presented combustion model for perfectly premixed and partially premixed conditions are demonstrated. The effect of partial premixing for the prediction of the reacting flow field is assessed by comparison of a perfectly premixed and partially premixed simulation. Even though significant mixture fraction fluctuations are observed, only small impact of the non-perfect premixing is found on the flow field and flame dynamics. Subsequently, the effect of heat loss to the walls is assessed assuming perfectly premixing. The adiabatic baseline case is compared to heat loss simulations with adiabatic and non-adiabatic chemistry tabulation. The results highlight the importance of considering the effect of heat loss on the chemical kinetics for an accurate prediction of the flow features. Both heat loss simulations significantly improve the temperature prediction, but the non-adiabatic chemistry tabulation is required to accurately capture the chemical composition in the reacting layers.

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Section: Modeling Approachmentioning

confidence: 99%

Section: Modeling Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Partial Premixing and Heat Loss on the Reacting Flow Field Prediction of a Swirl Stabilized Gas Turbine Model Combustor

Gövert

Mira

Kok

et al. 2017

Flow Turbulence Combust

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“…Chemistry based on tabulation, e.g. [42,120,121], can provide significant reduction in computational costs. Recently, a turbulent combustion model was proposed [121] that extended a tabulated chemistry model to account for product gas dilution and heat-loss effects by introducing simplified assumptions to reduce the model complexity.…”

Section: Development Of Chemical Kinetic Schemesmentioning

confidence: 99%

The combustion mitigation of methane as a non-CO 2 greenhouse gas

Jiang

Mira

Cluff

2018

Progress in Energy and Combustion Science

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ABSTRACT:Anthropogenic emissions of non-CO 2 greenhouse gases such as fugitive methane contribute significantly to global warming. A review of fugitive methane combustion mitigation and utilisation technologies, which are primarily aimed at methane emissions from coal mining activities, with a focus on modelling and simulation of ultra-lean methane oxidation/combustion is presented. The challenges associated with ultra-lean methane oxidation are on the ignition of the ultra-lean mixture and sustainability of the combustion process. There is a lack of fundamental studies on chemical kinetics of ultra-lean methane combustion and reliable kinetic schemes that can be used together with computational fluid dynamics studies to design and develop advanced mitigation systems. Mitigation of methane as a greenhouse gas calls for more efforts on understanding ultra-lean combustion. Recuperative combustion provides a promising means for mitigating ultra-lean methane emissions. Progress is needed on effective methods to ignite and to recuperate and retain heat for oxidation/combustion of the ultra-lean mixtures. Catalysts can be very effective in reducing the temperatures required for oxidation while plasmas may be utilised to assist the ignition, but thermodynamic/aerodynamic limits of burning ultra-lean methane remain unexplored. Further technological developments may be focussed on developing innovative capturing technology as well as technological innovations to achieve effective ignition and sustainable oxidation/combustion.

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“…• Type 2: Imposed wall temperatures [23][24][25][26][27] : when experimental data on wall temperatures is available, imposing them as boundary conditions for LES may be a solution. Note that this can be a dangerous methodology: imposing a high local wall temperature may for example, force the flame to anchor at this point, diminishing the predictive quality of the method by forcing the solution artificially.…”

Section: Introductionmentioning

confidence: 99%

Coupling heat transfer and large eddy simulation for combustion instability prediction in a swirl burner

Kraus

Selle

Poinsot

2018

Combustion and Flame

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. Large eddy simulations (LES) of combustion instabilities are often performed with simplified thermal wall boundary conditions, typically adiabatic walls. However, wall temperatures directly affect the gas temperatures and therefore the sound speed field. They also control the flame itself, its stabilization characteristics and its response to acoustic waves, changing the flame transfer functions (FTFs) of many combustion chambers. This paper presents an example of LES of turbulent flames fully coupled to a heat conduction solver providing the temperature in the combustor walls. LES results obtained with the fully coupled approach are compared to experimental data and to LES performed with adiabatic walls for a swirled turbulent methane/air burner installed at Engler-Bunte-Institute, Karlsruhe Institute of Technology and German Aerospace Center (DLR) in Stuttgart. Results show that the fully coupled approach provides reasonable wall temperature estimations and that heat conduction in the combustor walls strongly affects both the mean state and the unstable modes of the combustor. The unstable thermoacoustic mode observed experimentally at 750 Hz is captured accurately by the coupled simulation but not by the adiabatic one, suggesting that coupling LES with heat conduction solvers within combustor walls may be necessary in other configurations in order to capture flame dynamics.

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Turbulent combustion modelling of a confined premixed jet flame including heat loss effects using tabulated chemistry

Cited by 30 publications

References 34 publications

The Effect of Partial Premixing and Heat Loss on the Reacting Flow Field Prediction of a Swirl Stabilized Gas Turbine Model Combustor

The Effect of Partial Premixing and Heat Loss on the Reacting Flow Field Prediction of a Swirl Stabilized Gas Turbine Model Combustor

The combustion mitigation of methane as a non-CO 2 greenhouse gas

Coupling heat transfer and large eddy simulation for combustion instability prediction in a swirl burner

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