Numerical investigation of swirling kerosene spray flames using Large Eddy Simulation

Jones, W.P.; Lyra, S.; Navarro‐Martinez, S.

doi:10.1016/j.combustflame.2011.10.025

Cited by 70 publications

(34 citation statements)

References 32 publications

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“…Examples of the LES implementation of the stochastic fields can be found in nonpremixed flames [1,5,44], lifted flames [2], spark-ignition [45,83] and spray flames [46,47].…”

Section: Stochastic Field Methodsmentioning

confidence: 99%

Large Eddy Simulation of Premixed Turbulent Flames Using the Probability Density Function Approach

Dodoulas

Navarro‐Martinez

2013

Flow Turbulence Combust

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Abstract. In the present study a Large Eddy Simulation and Filtered Density Function model is applied to three premixed piloted turbulent methane flames at different Reynolds Numbers using the Eulerian stochastic fields approach. The model is able to reproduce the flame structure and flow characteristics with a low number of fields (between 4 and 16 fields). The results show a good agreement with experimental data with the same closures employed in non-premixed combustion without any adjustment for combustion regime. The effect of heat release on the flow field is captured correctly. A wide range of sensitivity studies is carried out, including the number of fields, the chemical mechanism, differential diffusion effects and micro-mixing closures. The present work shows that premixed combustion (at least in the conditions under study) can be modelled using LES-PDF methods.. Finally, the ability of the model to predict flame quenching is studied. The model can accurate capture the conditions at which combustion is not sustainable and large pockets of extinction appear.

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“…Examples of the LES implementation of the stochastic fields can be found in nonpremixed flames [1,5,44], lifted flames [2], spark-ignition [45,83] and spray flames [46,47].…”

Section: Stochastic Field Methodsmentioning

confidence: 99%

Large Eddy Simulation of Premixed Turbulent Flames Using the Probability Density Function Approach

Dodoulas

Navarro‐Martinez

2013

Flow Turbulence Combust

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“…A model is therefore needed for the description of the resulting dispersed liquid phase that is injected in the simulations, (2) The evolution of the droplet mist has to be described at a computational cost consistent with the available resources. Two main approaches exist for the large eddy simulation of two-phase reacting flows, both relying on mesoscopic models [12]: the Eulerian-Eulerian approach, where moments of the number density function (NDF) are transported [13,14] and the Eulerian-Lagrangian model where a set of individual particles are being tracked [15][16][17]. In the Eulerian-Lagrangian framework, it is relatively easy to account for polydispersion, while the Eulerian-Eulerian approach requires an additional set of transport equations for each moment and/or class of particle sizes, notably increasing the computational cost.…”

Section: Introductionmentioning

confidence: 99%

Large-Eddy Simulation of Light-Round in an Annular Combustor With Liquid Spray Injection and Comparison With Experiments

Lancien

Prieur

Durox

et al. 2017

Volume 4A: Combustion, Fuels and Emissions

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The light-round is defined as the process by which the flame initiated by an ignition spark propagates from burner to burner in an annular combustor, eventually leading to a stable combustion. Combining experiments and numerical simulation, it was recently demonstrated that under perfectly premixed conditions this process could be suitably described by large eddy simulation (LES) using massively parallel computations. The present investigation aims at developing light-round simulations in a configuration that is closer to that found in aero-engines by considering liquid nheptane injection. The large-eddy simulation of the ignition sequence of a laboratory scale annular combustion chamber comprising sixteen swirled spray injectors is carried out with a mono-disperse Eulerian approach for the description of the liquid phase. The objective is to assess this modeling approach of the two-phase reactive flow during the ignition process. The simulation results are compared in terms of flame structure and light-round duration to the corresponding experimental images of the flame front recorded by a high-speed intensified CCD camera and to the corresponding experimental delays. The dynamics of the flow is also analyzed to identify and characterize mechanisms controlling flame propagation during the light-round process.

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“…The sub-grid scale (SGS) turbulence models in FLUENT employ the Boussinesq hypothesis as in the RANS models. As a strong approach to research large scale coherent structures such as PVC by using spatial filter to equations and it has been widely applied to simulations of non-premixed combustion processes, LES' ability for accurately predicting complicated unsteady phenomenon and exploring gas turbine combustion has been confirmed in a number of studies [4,11,12].…”

Section: Numerical Model and Methodsmentioning

confidence: 99%

“…where ρ, u i , p and ν represent density, velocity, pressure and kinematic viscosity; Superscript '-' in the formula represents filtered physical quantity; τ ij = u i u j − u i u j represents sub-grid stress which is modeled by Smagorinsky model [11,22]:…”

Section: Large Eddy Simulation (Les) Modelmentioning

confidence: 99%

“…The advantage makes ignition much easier which then improves combustion efficiency and greatly lowers pollutant emissions. Numerical simulations of swirl burners include CFD (Computational Fluid Dynamics) investigation into turbulent spray breakup, effects of droplet sizes on burning behavior and etc., with Reynolds Averaged Navier-Stokes (RANS) or Large Eddy Simulation (LES) [11][12][13]. In some CFD investigations, the sub-grid scale probability density function approach has been used to account for turbulence-chemistry interactions.…”

Section: Introductionmentioning

confidence: 99%

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Large Eddy Simulation Analysis on Confined Swirling Flows in a Gas Turbine Swirl Burner

et al. 2017

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This paper describes a Large Eddy Simulation (LES) investigation into flow fields in a model gas turbine combustor equipped with a swirl burner. A probability density function was used to describe the interaction physics of chemical reaction and turbulent flow as liquid fuel was directly injected into the combustion chamber and rapidly mixed with the swirling air. Simulation results showed that heat release during combustion accelerated the axial velocity motion and made the recirculation zone more compact. As the combustion was taking place under lean burn conditions, NO emissions was less than 10 ppm. Finally, the effects of outlet contraction on swirling flows and combustion instability were investigated. Results suggest that contracted outlet can enhance the generation of a Central Vortex Core (CVC) flow structure. As peak RMS of velocity fluctuation profiles at center-line suggested the turbulent instability can be enhanced by CVC motion, the Power Spectrum Density (PSD) amplitude also explained that the oscillation at CVC position was greater than other places. Both evidences demonstrated that outlet contraction can increase the instability of the central field.

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Numerical investigation of swirling kerosene spray flames using Large Eddy Simulation

Cited by 70 publications

References 32 publications

Large Eddy Simulation of Premixed Turbulent Flames Using the Probability Density Function Approach

Large Eddy Simulation of Premixed Turbulent Flames Using the Probability Density Function Approach

Large-Eddy Simulation of Light-Round in an Annular Combustor With Liquid Spray Injection and Comparison With Experiments

Large Eddy Simulation Analysis on Confined Swirling Flows in a Gas Turbine Swirl Burner

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