A Mixing Timescale Model for PDF Simulations of LTC Combustion Process in Internal Combustion Engines

Maroteaux, Fadila; Mancaruso, Ezio; Vaglieco, Bianca Maria

doi:10.4271/2019-24-0113

Cited by 2 publications

(3 citation statements)

References 24 publications

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“…The results of the model have been validated against two engine operating conditions with a single early injection in the cycle. In reference [20], further validation of the time scale model against experimental data has been carried out, when the engine operates with five early injection in the cycle at 1000 rpm engine speed. This study has confirmed that a variable time scale is more accurate than a fixed one.…”

Section: Introductionmentioning

confidence: 99%

“…Note that details to derive Equations ( 9) and (10) from Equations ( 5) and ( 6) are given in [19,20].…”

mentioning

confidence: 99%

“…In engine application and particularly when a zero-dimensional model is used, the mean piston speed is more suitable than the instantaneous piston speed [20]. The average in-cylinder flow over the whole cycle is described by the mean piston speed.…”

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confidence: 99%

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Optical and Numerical Investigations on Combustion and OH Radical Behavior Inside an Optical Engine Operating in LTC Combustion Mode

Maroteaux

Mancaruso²,

Vaglieco³

2023

Energies

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Low Temperature Combustion (LTC) is a relevant process for internal combustion engines (ICE). This combustion mode is based on premixed fuel/air and fuel lean in-cylinder mixture allowing reduction in NOx and PM emissions while maintaining higher thermal efficiency. In order to investigate the effect of engine operating conditions on the behavior of LTC mode, including OH radical evolution, optical measurements and numerical simulations were performed on a transparent CR diesel engine. The homogeneity of the engine charge was obtained by using very early injection timings. In this study, varying injection strategies were investigated for different engine speeds. In parallel to the experimentation, simulations of LTC mode for the same experimental operations were carried out. The model used in this study is based on a stochastic reactor model. This model includes a turbulence (k-ε) model based on a zero-dimensional energy cascade to calculate the turbulent time scale during the cycle. On the other hand, due to the stochastic approach and to reduce initial heterogeneities of the mixture, a confidence parameter was introduced in the global model to consider the real variation ranges of engine. This latter was modeled as a function of the Reynolds number allowing to initiate heterogeneities of temperature and of species mass. OH radicals were estimated with high spatial and temporal resolution using chemiluminescence measurements. Simulated in-cylinder pressure and the OH radical rate were compared to the experimental data. A good agreement was observed in terms of in-cylinder pressure trace and ignition delay times, meaning that the confidence coefficient model is accurate to describe the initial heterogeneities of the mixture. The simulated OH rate profile has the same shape as the measured OH trace and the main ignition occurs at the same time. This study corroborates that the OH radical is an appropriate tool to identify combustion stages.

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Section: Introductionmentioning

confidence: 99%

“…Note that details to derive Equations ( 9) and (10) from Equations ( 5) and ( 6) are given in [19,20].…”

mentioning

confidence: 99%

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Optical and Numerical Investigations on Combustion and OH Radical Behavior Inside an Optical Engine Operating in LTC Combustion Mode

Maroteaux

Mancaruso²,

Vaglieco³

2023

Energies

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Theoretical Analysis of Multi-Zone and Transported Probability Density Function Approaches Applied to Low Temperature Combustion Process

Maroteaux,

Mancaruso,

Pommier

et al. 2023

SAE Technical Paper Series

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<div class="section abstract"><div class="htmlview paragraph">Electrification of transport, together with the decarbonization of energy production are suggested by the European Union for the future quality of air. However, in the medium period, propulsion systems will continue to dominate urban mobility, making mandatory the retrofitting of thermal engines by applying combustion modes able to reduce NOx and PM emissions while maintaining engine performances. Low Temperature Combustion (LTC) is an attractive process to meet this target. This mode relies on premixed mixture and fuel lean in-cylinder charge whatever the fuel type: from conventional through alternative fuels with a minimum carbon footprint. This combustion mode has been subject of numerous modelling approaches in the engine research community. This study provides a theoretical comparative analysis between multi-zone (MZ) and Transported probability density function (TPDF) models applied to LTC combustion process. The generic thermo-kinetic balances for both approaches have been analyzed in term of similarities. Only onion-skin for MZ models have been considered in this study. The governing assumptions linked to sub-models for each approach to describe mixing process for TPDF and interzonal heat and mass transport for MZ are discussed. This step identifies the calibrated model parameters for each approach and their effects on the accuracy in predicting LTC mode simulations. This work shows that the transported probability density function model has fewer parameters to calibrate compared to multi-zone model. Transported probability density function seems easier to use for LTC process.</div></div>

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A Mixing Timescale Model for PDF Simulations of LTC Combustion Process in Internal Combustion Engines

Cited by 2 publications

References 24 publications

Optical and Numerical Investigations on Combustion and OH Radical Behavior Inside an Optical Engine Operating in LTC Combustion Mode

Optical and Numerical Investigations on Combustion and OH Radical Behavior Inside an Optical Engine Operating in LTC Combustion Mode

Theoretical Analysis of Multi-Zone and Transported Probability Density Function Approaches Applied to Low Temperature Combustion Process

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