Implementation of a Tabulated Flamelet Model for Compression Ignition Engine Applications

Kundu, Prithwish; Ameen, Mohammed; Unnikrishnan, Umesh; Som, Sibendu

doi:10.4271/2017-01-0564

Cited by 8 publications

(11 citation statements)

References 25 publications

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“…While the flame for the δ-PDF is relatively thinner. The same findings were reported in other ECN spray(n-heptane or n-dodecane) combustion modelings using mRIF, FGM, TFM and TPDF models [10,17,8,7,18], attributing to turbulent fluctuations in these researches. As for the influence of variance of progress variable, the distribution of OH mass fraction in Fig.…”

Section: Effect Of Tci On Flame Structuresupporting

confidence: 88%

“…Neglecting the turbulencechemistry interaction makes the flame very thin and causes a higher peak mean value of temperature and OH mass fraction. These findings are similar to those obtained with other non-premixed turbulent combustion models in which the turbulencechemistry interaction is taken into account [10,17,7,18]. Wehrfritz et al [11] implemented the FGM combustion modeling approach to model the ECN spray A over a range of oxygen concentrations.…”

Section: Introductionsupporting

confidence: 77%

“…They investigated three cases at three different timings, and found all the predictions by presumed β-PDF are in excellent agreement with the statistics results of DNS. And β-PDF is also a widely employed choice in the related studies [2,7,8,9,10,11,12,13,14,18]. Mukhopadhyay et al [39] assessed the accuracy of such model in predicting autoignition and flame development in compositionally stratified n-heptane/air mixtures using direct numerical simulations (DNS).…”

Section: Turbulence Chemistry Interactionmentioning

confidence: 99%

“…In the present paper, RANS modelling of ECN spray A with the fuel of n-Dodecane is carried out using FGM [27] combustion model to account for the turbulence-chemistry interaction along with complex chemical reactions. The effect of variance of mixture fraction has already been investigated [10,8,7,18], with the conclusion of maximum temperature will be suppressed and OH becomes broader with the introduction of Z 2 , while lacking detailed explanation, which is one of topics in this study. In addition, variance of progress variable is neglected because of conventional wisdom that high temperature non-premixed combustion is mixing limited and it significantly relies on the rate of mixture formation, as reported in the previous literature [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of turbulence-chemistry interactions on auto-ignition and flame structure for n-dodecane spray combustion

Yan

Wang

Both

et al. 2019

Combustion Theory and Modelling

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The Engine Combustion Network (ECN) Spray A under diesel engine conditions is investigated with a non-adiabatic 5D Flamelet Generated Manifold (FGM) model with the consideration of detailed chemical kinetic mechanisms. The enthalpy deficit due to droplet vaporization is considered by employing an additional controlling parameter in the FGM library. In this FGM model, β-PDF is used for the PDF integration over the control variable space. Validation results in non-reacting conditions indicate relatively good agreement between the predicted and experimental data in terms of liquid and vapor penetrations and mixture fraction spatial distribution. In reacting conditions, the effects of variance of mixture fraction and progress variable were examined. The ignition delay time and the quasi-steady flame structure are both affected by the variances. The variance of mixture fraction delays the ignition process and the variance of progress variable accelerates it. For mixture fraction, the ignition process is quicker at any stage in the case of neglecting variance. While things are more complex for progress variable, the ignition process is advanced in the case of neglecting variance at early times, but surpassed by the case of β-PDF later and until auto-ignition. When variance of mixture fraction is considered, the OH mass fraction shows a wide spatial distribution. While if not, a very thin flame is observed with a higher peak in OH, and a very large lift-off length. The variance of progress variable has little impact on the global flame structure, but makes the flame lift-off length much shorter. This study confirms the general observation, that the variance of mixture fraction is of higher importance in high temperature nonpremixed combustion, however we found that the variance of progress variable is far from negligible.

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Section: Effect Of Tci On Flame Structuresupporting

confidence: 88%

Section: Introductionsupporting

confidence: 77%

Section: Turbulence Chemistry Interactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of turbulence-chemistry interactions on auto-ignition and flame structure for n-dodecane spray combustion

Yan

Wang

Both

et al. 2019

Combustion Theory and Modelling

View full text Add to dashboard Cite

show abstract

“…They obtained good agreements with the experimental results for a large range of experimental parameters, however, their combustion closure based on HR had strong assumption for rich mixture fractions where it was cut after certain yet reactive fuel flammability limits. Also Kundu et al [29] applied flamelet residence time in table generation instead of progress variable. They reported promising result for a temperature sweep of ECN Spray A configuration as well as an optical engine case.…”

Section: Introduction To Tabulated Chemistrymentioning

confidence: 99%

Modelling compression ignition engines by incorporation of the flamelet generated manifolds combustion closure

Maghbouli

Akkurt

Lucchini

et al. 2018

Combustion Theory and Modelling

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Tabulated chemistry models allow to include detailed chemistry effects at low cost in numerical simulations of reactive flows. Characteristics of the reactive fluid flows are described by a reduced set of parameters that are representative of the flame structure at small scales so-called flamelets. For a specific turbulent combustion configuration, flamelet combustion closure, with proper formulation of the flame structure can be applied. In this study, flamelet generated manifolds (FGM) combustion closure with progress variable approach were incorporated with OpenFOAM ® source code to model combustion within compression ignition engines. For IC engine applications, multidimensional flamelet look-up tables for counter flow diffusive flame configuration were generated. Source terms of non-premixed combustion configuration in flamelet domain were tabulated based on pressure, temperature of unburned mixture, mixture fraction, and progress variable. A new frozen flamelet method was introduced to link one dimensional reaction diffusion space to multi-dimensional Computational Fluid Dynamics (CFD) physical space to fulfill correct modelling of thermal state of the engine at expansion stroke when charge composition was changed after combustion and reaction rates were subsided. Predictability of the developed numerical framework were evaluated for Sandia Spray A (constant volume vessel), Spray B (light duty optical Diesel engine), and a heavy duty Diesel engine experiments under Reynolds averaged Navier Stokes turbulence formulation. Results showed that application of multi-dimensional FGM combustion closure can comprehensively predict key parameters such as: ignition delay, in-cylinder pressure, apparent heat release rate, flame lift-off , and flame structure in Diesel engines.

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Recent Progress in Turbulent Combustion Modeling of Spray Flames Using Flamelet Models

Kundu

Ameen

Som

2017

Energy, Environment, and Sustainability

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Implementation of a Tabulated Flamelet Model for Compression Ignition Engine Applications

Cited by 8 publications

References 25 publications

Effects of turbulence-chemistry interactions on auto-ignition and flame structure for n-dodecane spray combustion

Effects of turbulence-chemistry interactions on auto-ignition and flame structure for n-dodecane spray combustion

Modelling compression ignition engines by incorporation of the flamelet generated manifolds combustion closure

Recent Progress in Turbulent Combustion Modeling of Spray Flames Using Flamelet Models

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