Availability analysis of a syngas fueled spark ignition engine using a multi-zone combustion model

Rakopoulos, C.D.; Michos, Constantine N.; Giakoumis, Evangelos G.

doi:10.1016/j.energy.2008.05.007

Cited by 90 publications

(41 citation statements)

References 28 publications

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“…Rakopoulos and Michos [33] developed a multi-zone combustion model for prediction of SI engine performance and NO emissions. They also presented an availability analysis of the same engine with varying load by using syngas as fuel [34]. The computed NO emissions from the multi-zone model for various engine loads found to be in good agreement with the respective experimental ones.…”

Section: Introductionsupporting

confidence: 70%

Theoretical performance limits of a syngas–diesel fueled compression ignition engine from second law analysis

Sahoo

Saha

Sahoo

2011

Energy

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Section: Introductionsupporting

confidence: 70%

Theoretical performance limits of a syngas–diesel fueled compression ignition engine from second law analysis

Sahoo

Saha

Sahoo

2011

Energy

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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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“…The detailed description of a second-law analysis, applied to the zero-dimensional multi-zone code of in references [22] and [23], has already been reported by the present authors [45]. The various availability terms (i.e.…”

Section: Second-law (Availability) Analysismentioning

confidence: 98%

Studying the effects of hydrogen addition on the second-law balance of a biogas-fuelled spark ignition engine by use of a quasi-dimensional multi-zone combustion model

Rakopoulos

Michos

Giakoumis

2008

Proceedings of the Institution of Mechanical Engineers, Part D:

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Although a first-law analysis can show the improvement that hydrogen addition impacts on the performance of a biogas-fuelled spark-ignition (SI) engine, additional benefits can be revealed when the second law of thermodynamics is brought into perspective. It is theoretically expected that hydrogen enrichment in biogas can increase the second-law efficiency of engine operation by reducing the combustion-generated irreversibilities, because of the fundamental differences in the mechanism of entropy generation between hydrogen and traditional hydrocarbon combustion. In this study, an experimentally validated closed-cycle simulation code, incorporating a quasi-dimensional multi-zone combustion model that is based on the combination of turbulent entrainment theory and flame stretch concepts for the prediction of burning rates, is further extended to include second-law analysis for the purpose of quantifying the respective improvements. The analysis is applied for a single-cylinder homogeneous charge SI engine, fuelled with biogas-hydrogen blends, with up to 15 vol % hydrogen in the fuel mixture, when operated at 1500 r/min, wide-open throttle, fuel-to-air equivalence ratio of 0.9, and ignition timing of 20u crank angle before top dead centre. Among the major findings derived from the second-law balance during the closed part of the engine cycle is the increase in the second-law efficiency from 40.85 per cent to 42.41 per cent with hydrogen addition, accompanied by a simultaneous decrease in the combustion irreversibilities from 18.25 per cent to 17.18 per cent of the total availability of the charge at inlet valve closing. It is also illustrated how both the increase in the combustion temperatures and the decrease in the combustion duration with increasing hydrogen content result in a reduction in the combustion irreversibilities. The degree of thermodynamic perfection of the combustion process from the second-law point of view is quantified by using two (differently defined) combustion exergetic efficiencies, whose maximum values during the combustion process increase with hydrogen enrichment from 49.70 per cent to 53.45 per cent and from 86.01 per cent to 87.33 per cent, respectively.

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Availability analysis of a syngas fueled spark ignition engine using a multi-zone combustion model

Cited by 90 publications

References 28 publications

Theoretical performance limits of a syngas–diesel fueled compression ignition engine from second law analysis

Theoretical performance limits of a syngas–diesel fueled compression ignition engine from second law analysis

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

Studying the effects of hydrogen addition on the second-law balance of a biogas-fuelled spark ignition engine by use of a quasi-dimensional multi-zone combustion model

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