The role of detailed chemical kinetics on CFD diesel spray ignition and combustion modelling

Novella, Ricardo; García, Antonio; Pastor, J.M.; Domenech, Vicent

doi:10.1016/j.mcm.2010.12.048

Cited by 63 publications

(33 citation statements)

References 76 publications

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“…The widespread applicability of this reaction mechanism was demonstrated later in several studies that explored combustion processes beyond the initial target range [18,[24][25][26] and for simulations of internal combustion engines [27,28]. This reaction mechanism [18] is the starting point for the modeling part of the present work.…”

Section: Introductionmentioning

confidence: 83%

Comprehensive kinetic modeling and experimental study of a fuel-rich, premixed n-heptane flame

Seidel

Moshammer

Wang

et al. 2015

Combustion and Flame

112

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Section: Introductionmentioning

confidence: 83%

Comprehensive kinetic modeling and experimental study of a fuel-rich, premixed n-heptane flame

Seidel

Moshammer

Wang

et al. 2015

Combustion and Flame

112

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“…Recently, this modelling has been extended to the LES framework and some models have been developed. The default model of τ m in OpenFOAM uses the effective viscosity (μ e f f = μ + μ t ) and the dissipation rate, which has been used in previous studies of turbulent flames [50,79]. The present study applies a recently developed mixing time model which is used in the extended LES-PaSR model for high Reynolds, moderate Damköhler number turbulent flames [80,81].…”

Section: Numerical Methods For Flame Simulationsmentioning

confidence: 99%

Prediction of combustion instability limit cycle oscillations by combining flame describing function simulations with a thermoacoustic network model

Han

Morgans

2015

Combustion and Flame

194

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a b s t r a c t Accurate prediction of limit cycle oscillations resulting from combustion instability has been a long-standing challenge. The present work uses a coupled approach to predict the limit cycle characteristics of a combustor, developed at Cambridge University, for which experimental data are available (Balachandran, Ph.D. thesis, 2005). The combustor flame is bluff-body stabilised, turbulent and partially-premixed. The coupled approach combines Large Eddy Simulation (LES) in order to characterise the weakly non-linear response of the flame to acoustic perturbations (the Flame Describing Function (FDF)), with a low order thermoacoustic network model for capturing the acoustic wave behaviour. The LES utilises the open source Computational Fluid Dynamics (CFD) toolbox, OpenFOAM, with a low Mach number approximation for the flow-field and combustion modelled using the PaSR (Partially Stirred Reactor) model with a global one-step chemical reaction mechanism for ethylene/air. LES has not previously been applied to this partially-premixed flame, to our knowledge. Code validation against experimental data for unreacting and partially-premixed reacting flows without and with inlet velocity perturbations confirmed that both the qualitative flame dynamics and the quantitative response of the heat release rate were captured with very reasonable accuracy. The LES was then used to obtain the full FDF at conditions corresponding to combustion instability, using harmonic velocity forcing across six frequencies and four forcing amplitudes. The low order thermoacoustic network modelling tool used was the open source OSCILOS (http://www.oscilos.com). Validation of its use for limit cycle prediction was performed for a well-documented experimental configuration, for which both experimental FDF data and limit cycle data were available. The FDF data from the LES for the present test case was then imported into the OSCILOS geometry network and limit cycle oscillations of frequency 342 Hz and normalised velocity amplitude of 0.26 were predicted. These were in good agreement with the experimental values of 348 Hz and 0.21 respectively. This work thus confirms that a coupled numerical prediction of limit cycle behaviour is possible using an entirely open source numerical framework.

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“…Chemical equilibrium state relations were chosen to account for the intermediate species generated and disappearing during the combustion reactions. The maximum number of species in the reactions was set to 41, which is a moderate number compared with highly complex models, which have 110 species, because it was investigated in the ERC-PRF mechanism [47]. After the look-up tables were generated, the number of species in the reactions was either 22 or 32 in different simulations of the present study.…”

Section: Chemical Reaction Modelmentioning

confidence: 99%

Modelling and Optimization of a Small Diesel Burner for Mobile Applications

et al. 2018

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While extensive research has been done on improving diesel engines, much less has been done on auxiliary heaters, which have their own design challenges. The study analyzes how to optimize the combustion performance of an auxiliary heater, a 6 kW diesel burner, by investigating key parameters affecting diesel combustion and their properties. A model of a small diesel heater, including a simulation of fuel injection and combustion process, was developed step-wise and verified against experimental results that can be used for scaling up to 25 kW heaters. The model was successfully applied to the burner, predicting the burner performance in comparison with experimental results. Three main variables were identified as important for the design. First, it was concluded that the distance from the ring cone to the nozzle is essential for the fluid dynamics and flame location, and that the ring cone should be moved closer to the nozzle for optimal performance. Second, the design of the swirl co-flow is important, and the swirl number of the inlet air should be kept above 0.6 to stabilize the flame location for the present burner design. Finally, the importance of the nozzle diameter to avoid divergent particle vaporization was pointed out.

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The role of detailed chemical kinetics on CFD diesel spray ignition and combustion modelling

Cited by 63 publications

References 76 publications

Comprehensive kinetic modeling and experimental study of a fuel-rich, premixed n-heptane flame

Comprehensive kinetic modeling and experimental study of a fuel-rich, premixed n-heptane flame

Prediction of combustion instability limit cycle oscillations by combining flame describing function simulations with a thermoacoustic network model

Modelling and Optimization of a Small Diesel Burner for Mobile Applications

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