The influence of Exhaust Gas Recirculation (EGR) on combustion and emissions of n-heptane/natural gas fueled Homogeneous Charge Compression Ignition (HCCI) engines

Fathi, Morteza; Saray, Rahim Khoshbakhti; Checkel, M. David

doi:10.1016/j.apenergy.2011.06.017

Cited by 132 publications

(50 citation statements)

References 16 publications

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“…Consequently, the ignition delay of the simplified mixture is shorter than the delay of the real EGR and, therefore, ignition delay errors are negative. Furthermore, the higher the initial temperature, the higher this thermodynamic effect and the more negative These thermodynamic and chemical effects are coherent with those exposed by Fathi et al [28], Di et al [31], Dec et al [26] and Wooldridge et al [48].…”

Section: Chemical Effectsupporting

confidence: 73%

“…Both the influence of the EGR temperature on the heat losses and the degree of EGR stratification (temperature and composition heterogeneities) were analyzed in a natural gas engine for different variable valve actuation strategies. These EGR thermodynamic effects in natural gas engines were also studied by Fathi et al [28] concluding that the thermal losses decrease if the percentage of cold EGR increases because lower temperatures are reached.…”

Section: Justification and Objectivementioning

confidence: 96%

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Design of synthetic EGR and simulation study of the effect of simplified formulations on the ignition delay of isooctane and n-heptane

Desantes

López

Molina

et al. 2015

Energy Conversion and Management

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A method to create synthetic mixtures that simulate the Exhaust Gas Recirculation (EGR) of an internal combustion engine, using O 2 , N 2 , CO 2 , H 2 O and Ar, has been designed. Different simplifications of this synthetic EGR error increases with temperature and decreases with pressure, equivalence ratio and oxygen mass fraction. Finally, the limit oxygen mass fractions for the use of each simplification have been obtained. Based on these results, it can be concluded that the only gas that can be obviated to keep the error in ignition delay under 1% is Ar.

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Section: Chemical Effectsupporting

confidence: 73%

Section: Justification and Objectivementioning

confidence: 96%

Design of synthetic EGR and simulation study of the effect of simplified formulations on the ignition delay of isooctane and n-heptane

Desantes

López

Molina

et al. 2015

Energy Conversion and Management

View full text Add to dashboard Cite

show abstract

“…The mixture enters into the cylinder during the suction stroke and the turbulence generated by intake flow improves further homogeneity. This method of mixture preparation has been found to be quite successful with gasoline and alcoholic fuels [26][27][28][29][30][31][32][33]. The main demerit of this strategy is that the start of combustion cannot be controlled by the injection timing.…”

Section: Port Fuel Injection (Pfi)mentioning

confidence: 99%

Homogeneous Charge Compression Ignition (HCCI) Combustion Engine- A Review

Kumar¹,

Rehman²

2014

IOSRJMCE

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“…The EGR is either achieved by trapping hot exhaust gas in-cylinder with the Negative Valve Overlap (NVO) concept or burnt gas load during intake, so-called Burnt Gas Re-Breathing (BGRB) [2]. The combustion timing of CAI is controlled by the chemical kinetics and highly depends on the properties of the mixture field [2,[5][6][7][8][9][10]. Inhomogeneities in the mixture and temperature field designate the combustion characteristics of CAI [2,5].…”

Section: Introductionmentioning

confidence: 99%

Understanding the Influences of Thermal and Mixture Inhomogeneities on the Auto-Ignition Process in a Controlled Auto-Ignition (CAI) Engine Using LES

Yildar

Kuenne

et al. 2017

Oil & Gas Science and Technology - Rev. IFP Energies nouvel

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-This work applies Large Eddy Simulation (LES) to the combustion process within a CAI engine. The chemical reaction is treated with a pre-tabulation approach based on homogeneous reactor simulations. At this juncture, a five-dimensional chemistry database is employed where the thermochemical properties are a function of the unburnt gas temperature, the air-fuel ratio, the exhaust gas ratio, the pressure, and the reaction progress variable. Statistical quantities are gathered for 20 simulated cycles and the averaged pressure curves get compared to measurements. The simulation data are then used to provide further insight into the auto-ignition process. It will be shown how thermochemical states are distributed within the cylinder and how the ignition quality depends on them. A statistical analysis is conducted to identify manifolds in the multi-dimensional scalar space along which the conditions leading to ignition evolve. Furthermore the strong influence in between consecutive cycles caused by the exhaust gas is investigated to identify the mechanism of cycle-to-cycle variations.

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The influence of Exhaust Gas Recirculation (EGR) on combustion and emissions of n-heptane/natural gas fueled Homogeneous Charge Compression Ignition (HCCI) engines

Cited by 132 publications

References 16 publications

Design of synthetic EGR and simulation study of the effect of simplified formulations on the ignition delay of isooctane and n-heptane

Design of synthetic EGR and simulation study of the effect of simplified formulations on the ignition delay of isooctane and n-heptane

Homogeneous Charge Compression Ignition (HCCI) Combustion Engine- A Review

Understanding the Influences of Thermal and Mixture Inhomogeneities on the Auto-Ignition Process in a Controlled Auto-Ignition (CAI) Engine Using LES

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