Assessing the effect of mass transfer on the formation of HC and CO emissions in HCCI engines, using a multi-zone model

Komninos, N.P.

doi:10.1016/j.enconman.2009.01.026

Cited by 33 publications

(17 citation statements)

References 26 publications

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“…The main advantage of multi-zone models over computational fluid dynamics (CFD) tools is that more detailed chemical mechanisms can be applied directly. Therefore multi-zone modeling has been applied extensively in engine community [8][9][10][11][12][13][14][15][16]. In those studies, the complex flow phenomena are ignored.…”

Section: Introductionmentioning

confidence: 99%

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

Egüz

Maes

Leermakers

et al. 2013

Int.J Automot. Technol.

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Premixed charge compression ignition (PCCI) is a clean and efficient alternative for classical diesel combustion. The concept of PCCI combustion is associated with early injection of the fuel whilst applying high exhaust gas recirculation (EGR) levels and operation with a highly lean mixture such that ignition takes place (well) after the injection event. Thus, it is possible to reduce soot and oxides of nitrogen (NO x ) emissions simultaneously. PCCI combustion is analyzed using a multi-zone model. In the multi-zone model, chemical mechanisms which are much more detailed compared to those used in computational fluid dynamics (CFD) approaches can be introduced directly. The CFD model is still used to predict the initial fuel stratification in the cylinder which is important to improve the quality of the model. For the analysis, dedicated experiments with n-heptane are used to evaluate the results of the model. In such a multi-zone model, 10 zones prove to be sufficient to describe the stratification with adequate resolution. It is observed that different fuel distributions have a large influence on the emissions when there is no mixing between the zones. To overcome this dependence, a basic inter-zonal diffusive 2 mixing is applied. The level of mixing is estimated with a sensitivity study. When the inter-zonal mixing is included, emission results become much less sensitive to the crank angle (CA) at which the charge stratification is sampled and the simulation is initialized.

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Section: Introductionmentioning

confidence: 99%

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

Egüz

Maes

Leermakers

et al. 2013

Int.J Automot. Technol.

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“…According to the aforementioned, the combustion prolongation does not seem to be due to the process of mass transfer but can be attributed predominantly to the adiabatic assumption. A more complete treatment on the mechanism of mass transfer and its effect on HCCI combustion can be found in [38].…”

Section: Resultsmentioning

confidence: 99%

The effect of thermal stratification on HCCI combustion: A numerical investigation

Komninos

2015

Applied Energy

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“…More recently, the Yang and Martin formulas for turbulent conductivity and the adaptation to HCCI multi-zone modeling, as presented herein and in previous studies by the authors [30,31], has been adopted by other researches in their HCCI multi-zone models [37][38][39].…”

Section: Heat Transfermentioning

confidence: 99%

“…In this section a brief outline of the multi-zone model is provided, since its development has been presented in detail in previous reports [30][31][32].…”

Section: Model Descriptionmentioning

confidence: 99%

“…Such nonuniform conditions are encountered in real engines and can be described only with the use of multi-zone and CFD models. Complex processes such as heat and mass transfer determine the temperature field within the combustion chamber and affect significantly the formation of CO and HC [30]. Since the formation of these pollutants also depends on chemical kinetics, their prediction imposes a challenge to any chemical mechanism, especially the reduced ones.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of a Detailed and a Reduced Ethanol Oxidation Mechanism in HCCI Combustion Using a Multi-Zone Model

N.P.¹

2011

TOREJ

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Abstract:The subject of the present study is the comparison of a detailed and a reduced ethanol oxidation mechanism. The main scope is to determine whether the reduction of species and reactions, which reduces the simulation time, affects the prediction of performance and emissions from a multi-zone model. The numerical study is conducted using a previously published multi-zone model, which incorporates chemical kinetics for the estimation of reaction rates. The model also includes sub-models for the description of heat transfer, mass transfer and crevice flow, and produces a temperature distribution within the combustion chamber. The cases simulated and examined involve ethanol HCCI combustion in a reciprocating internal combustion engine with various equivalence ratios. At each load two simulations are conducted with the multi-zone model, i.e. one with each oxidation mechanism, and the results are compared to the corresponding experimental results. The comparison of the two oxidation mechanisms includes simulation times, pressure traces, heat release rates, composition and quantity of unburned hydrocarbons emissions, including their composition, carbon monoxide and nitrogen oxides emissions. The reduced model decreases the simulation time by 50%. The two mechanisms produce almost identical results as regards ignition timing. The pollutant emissions predicted are essentially the same for the two mechanisms, with the greatest difference occurring between predicted CO emissions (~9%) at the low load cases.

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Assessing the effect of mass transfer on the formation of HC and CO emissions in HCCI engines, using a multi-zone model

Cited by 33 publications

References 26 publications

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

Predicting auto-ignition characteristics of RCCI combustion using a multi-zone model

The effect of thermal stratification on HCCI combustion: A numerical investigation

Comparison of a Detailed and a Reduced Ethanol Oxidation Mechanism in HCCI Combustion Using a Multi-Zone Model

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