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

Komninos, N.P.

doi:10.1016/j.apenergy.2014.10.089

Cited by 26 publications

(11 citation statements)

References 35 publications

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“…Komninos [42] conducted a numerical investigation on HCCI combustion to study the thermal stratification. The geometric configuration of the multi-zone model and cylindrical arbitrary zones can be seen from Fig.…”

Section: Homogeneous Charge Compression Ignition Enginementioning

confidence: 99%

Homogeneous Charge Compression Ignition (HCCI) Engines: A Review

Sharma

Rao

Murthy

2015

Arch Computat Methods Eng

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The homogeneous charge compression ignition (HCCI) combustion is considered to be the principally promising future IC engine concepts. HCCI is a concept of hybrid combustion, between the Otto engine and Diesel engine. HCCI is however not a modern finding. Already in the early twentieth century hot bulb engines operated with an HCCI-like combustion. They were superior in terms of brake efficiency compared with the contemporary gasoline engines and at the same level as the diesel engines. High engine efficiencies and ultra low NO emissions and low particulates are the benefits of HCCI engines. Volumetric auto ignited combustion of the compressed lean air-fuel mixture is attributed to these benefits. There are few drawbacks also were there in HCCI engines like, low specific output, narrow operating range, lack control over the ignition process, long start up time and high emissions like CO and UHC emissions. The CO and UHC emissions can be after treated using catalytic converters. In this study a literature review on HCCI engine has been performed and the parameters affecting the HCCI combustion phasing, performance and emissions were discussed. Strategies to widen the peak load bearing capacity of HCCI engine, reducing the emissions like NOx, CO and UHC, easy autoignition were discussed in the present study.

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Section: Homogeneous Charge Compression Ignition Enginementioning

confidence: 99%

Homogeneous Charge Compression Ignition (HCCI) Engines: A Review

Sharma

Rao

Murthy

2015

Arch Computat Methods Eng

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“…Compression Ignition (PCCI) and other advanced engine combustion modes based on Low Temperature Combustion (LTC), have been studied in the last years as ways to simultaneously reduce soot and N O x emissions in Compression Ignition (CI) engines [1,2]. These modes manage to accomplish such task; however, high emissions of unburned hydrocarbons (UHC) and carbon monoxide (CO) are achieved.…”

Section: Homogeneous Charge Compression Ignition (Hcci) Premixed Chargementioning

confidence: 99%

Study of the auto-ignition phenomenon of PRFs under HCCI conditions in a RCEM by means of spectroscopy

et al. 2016

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ElsevierDesantes Fernández, JM.; García Oliver, JM.; Vera-Tudela-Fajardo, WM.; López Boulouchos, K. (2016). Study of the auto-ignition phenomenon of PRFs under HCCI conditions in a RCEM by means of spectroscopy. Applied Energy. 179:389-400. AbstractAn investigation of the effects of contour conditions and fuel properties on the auto-ignition and combustion process under HCCI conditions is presented in this study. A parametric variation of initial temperature, intake pressure, compression ratio, oxygen concentration and equivalence ratio has been car- ried out for Primary Reference Fuels in a Rapid Compression ExpansionMachine while applying spectroscopy. The results have also been contrasted with natural chemiluminescence measurements. Additionally, the experiments have been simulated in CHEMKIN and the results derived from the optical techniques have been compared with the results from the chemical kinetics of the process, validating the chemical kinetic mechanism and an additional sub-model of excited OH * . Two different scenarios can be seen according to the results from the spectrograph. For very lean or very low- * Corresponding author

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“…Despite the evolution of the HPC concepts, the challenge about the narrow engine operating range was still unsolved [17]. Therefore, the proper operation with the HPC strategies requires using other additional strategies to control the ignition delay and incylinder pressure gradients [18]. One of the most effective ways to extend the ignition delay is the use of exhaust gas recirculation (EGR), which is based on increasing the incylinder specific heat capacity and reduce the oxygen content to slow down the temperature rise during the compression stroke [19].…”

Section: Introductionmentioning

confidence: 99%

Miller cycle for improved efficiency, load range and emissions in a heavy-duty engine running under reactivity controlled compression ignition combustion

Molina

García

Monsalve‐Serrano

et al. 2018

Applied Thermal Engineering

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The low temperature, premixed combustion strategies are being investigated in the recent years as a mean to break the NOx-soot trade-off appearing during the diffusive conventional diesel combustion. This approach relies on promoting premixed combustion events with shortened duration, which reduces the heat transfer losses, improves the thermal efficiency, and allows a simultaneous reduction of engine-out NOx and soot emissions. However, since the combustion onset only depends on chemical kinetics, most of these strategies cannot be implemented at medium and high loads due to excessive pressure gradients, which lead to unacceptable noise levels and reliability issues. This experimental work investigates the potential of the Miller cycle as a strategy to minimize the aforementioned challenges when operating under reactivity controlled compression ignition combustion. Moreover, the coupled effect of the Miller cycle with the fuel reactivity modulation is also explored as a way for improving the combustion control. For this purpose, parametric studies varying the effective compression ratio and gasoline fraction have been done in a single-cylinder heavy-duty engine operating at 14 bar indicated mean effective pressure and 1200 rev/min as a baseline condition. The results show that this strategy allows better control of the in-cylinder thermodynamic conditions, enabling a simultaneous reduction of nitrogen oxides and soot emissions down to the EURO VI limits, while keeping a reduced fuel consumption and suitable incylinder maximum pressure gradients.

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

Cited by 26 publications

References 35 publications

Homogeneous Charge Compression Ignition (HCCI) Engines: A Review

Homogeneous Charge Compression Ignition (HCCI) Engines: A Review

Study of the auto-ignition phenomenon of PRFs under HCCI conditions in a RCEM by means of spectroscopy

Miller cycle for improved efficiency, load range and emissions in a heavy-duty engine running under reactivity controlled compression ignition combustion

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