Spark Ignition Engine Simulation Using a Flamelet Based Combustion Model

Ahmed, Irufan; Ghiasi, Golnoush; Raj, Abhishek; Swaminathan, Nedunchezhian; Koch, Jann; Steurs, Karel; Wright, Yuri M.

doi:10.4271/2015-24-2402

Cited by 8 publications

(4 citation statements)

References 49 publications

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“…Parameters relating to length scales, such as the turbulent eddy size, normally represented by the integral length scale ( l T ) and thermal flame thickness ( δ L 0 ) are not accounted for. Despite its simplicity, this correlation has been widely used especially in engine combustion simulation, as reported, for example, in Ahmed et al, 25 Koch et al 53 and Xu et al 60 due to its robustness and straightforward implementation. Gülder 30 proposed three turbulent flame speed correlations for three different regimes separately as shown in equations (6)–(8)…”

Section: Methodsmentioning

confidence: 99%

“…Various combustion models have been proposed and applied to real engine configurations. 23–26 Among them, G -equation combustion model has been widely accepted and used towards cases from lab-scale flames 27 to the engine combustion. As discussed in Peters’ 28 work, the core part of the G -equation combustion model is the numerical description of the advancement of the level-set iso-surface which can be physically interpreted as the consumption turbulent flame speed S T .…”

Section: Introductionmentioning

confidence: 99%

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Characterization of combustion in a gas engine ignited using a small un-scavenged pre-chamber

Wright

Schiliro

et al. 2018

International Journal of Engine Research

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Prechamber ignition technology receives increasing attention due to its considerable improvement on engine combustion efficiency and stability. However, fundamental knowledge concerning flame propagation inside the pre-chamber and jet formation in the main chamber is still quite scarce. In this study, a small (<0.5% VTDC) un-scavenged pre-chamber was tested in a medium size gas engine with pressure transducers installed in both pre- and main chamber. Three-dimensional computational reactive fluid dynamics Reynolds-averaged Navier–Stokes simulations were carried out using a level-set combustion model –G-equation – towards improved understanding of the combustion processes occurring inside the pre and main chamber. The characteristics of the turbulence and the flame at locations just ahead of the propagating turbulent flame front were recorded and analysed by means of the well-known Borghi–Peters diagram. The results revealed that the characteristics of the flame inside the pre-chamber differed greatly from those inside the main chamber due to considerably reduced turbulent length scales. In addition, a wide range of turbulence intensity and length scales are covered throughout the combustion event, presenting a significant challenge to modelling of flame–turbulence interaction. Various turbulent flame speed ( ST) closures widely used in internal combustion engine simulation were therefore assessed and the ranges of their respective model constants explored. A correlation for ST is subsequently proposed by blending two formulations of Gülder developed for small and large scale turbulence, respectively, and compared to the well-known Peters correlation. With appropriate model constants, both successfully reproduce the pre and main chamber combustion for the reference case in terms of evolutions of cylinder pressure, heat release rate and pressure difference between pre and main chamber. Following successful calibration of the reference operating condition, variations in engine speed, load, spark timing and lambda were calculated using both correlations, demonstrating encouraging predictive capabilities of the proposed modelling strategy.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of combustion in a gas engine ignited using a small un-scavenged pre-chamber

Wright

Schiliro

et al. 2018

International Journal of Engine Research

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“…(10) works well and can be used in LES of engine simulations, which will be explored in a future study. using URANS paradigm has been explored in the past [33,34] its application in LES framework for engine flows will be explored in future.…”

Section: Evaluation Of ǫ C Closurementioning

confidence: 99%

“…This model has been tested for laboratory scale flames [25][26][27][28][29] and practical burners [30,31] including engine relevant flow and flame conditions [32]. Its capability for IC engine simulation has also been tested in [33,34] using URANS approach.…”

Section: Introductionmentioning

confidence: 99%

Assessment of SGS closure for isochoric combustion of hydrogen-air mixture

Ghiasi

Doan

Swaminathan

et al. 2018

International Journal of Hydrogen Energy

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Direct numerical simulation (DNS) data of freely propagating turbulent premixed flame of stoichiometric hydrogen air mixture inside a closed vessel is analysed to study a sub-grid combustion closure based on unstrained flamelet approach. This modelling framework needs closures for the sub-grid scale (SGS) reaction rate and scalar dissipation rate. The results show that the closure models for these two SGS quantities work quite well. The dissipation rate closure involves a scale dependent parameter, β c , which is related to the flame curvature induced effects. The reactivity of reactant mixture increases with time in isochoric combustion because the mixture temperature and pressure increases with time. This also influences the parameter β c and thus the dynamic evaluation of this parameter is investigated using the DNS data.

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Experimental and numerical investigations of the unscavenged prechamber combustion in a rapid compression and expansion machine under engine-like conditions

Kotzagianni

Kyrtatos

et al. 2019

Combustion and Flame

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Spark Ignition Engine Simulation Using a Flamelet Based Combustion Model

Cited by 8 publications

References 49 publications

Characterization of combustion in a gas engine ignited using a small un-scavenged pre-chamber

Characterization of combustion in a gas engine ignited using a small un-scavenged pre-chamber

Assessment of SGS closure for isochoric combustion of hydrogen-air mixture

Experimental and numerical investigations of the unscavenged prechamber combustion in a rapid compression and expansion machine under engine-like conditions

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