Stoichiometric Natural Gas Combustion in a Single Cylinder SI Engine and Impact of Charge Dilution by Means of EGR

Schöffler, Tobias; Hoffmann, Kai; Koch, Thomas

doi:10.4271/2013-24-0113

Cited by 14 publications

(3 citation statements)

References 12 publications

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“…The operation limits are determined by an increasing instability of the combustion process. At high dilution rates close to the misfire limit, an abrupt transition from stable to unstable engine operation is characteristic [13].…”

Section: Measurements Of the In-cylinder Pressure Trace In A Single Cmentioning

confidence: 99%

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Validation of turbulent flame speed models for methane–air-mixtures at high pressure gas engine conditions

Ratzke

Schöffler

Kuppa

et al. 2015

Combustion and Flame

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Section: Measurements Of the In-cylinder Pressure Trace In A Single Cmentioning

confidence: 99%

“…General engine details are listed in Table 1. Further information and a more detailed description can be found in [13].…”

Section: Measurements Of the In-cylinder Pressure Trace In A Single Cmentioning

confidence: 99%

Validation of turbulent flame speed models for methane–air-mixtures at high pressure gas engine conditions

Ratzke

Schöffler

Kuppa

et al. 2015

Combustion and Flame

Self Cite

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“…1,2,5 In recent publications, a variety of Diesel engines have been converted in order to be powered by compressed natural gas (CNG) and Diesel fuel. 1,2,[8][9][10][11] . In other publications, spark ignition (SI) engines have been modified to be fuelled by a blend of CNG and H 2 .…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic investigation of different natural gas combustion processes on the basis of a heavy-duty engine

Barnstedt

Ratzberger

Grabner

et al. 2015

International Journal of Engine Research

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The main challenges in engine development are the compliance to the stringent and constantly tightened emission limits and the reduction in the CO2 release. Natural gas as fuel offers one possible way of CO2 reduction. Several research projects on gas engine investigations of different engine size are executed at the Institute of Internal Combustion Engines and Thermodynamics at the TU Graz. In one of these projects, a single-cylinder-research-engine was derived from a heavy-duty Diesel engine. This single-cylinder-research-engine was then adapted for the combustion of natural gas and equipped with a spark ignition system for the underlying investigations. Different cylinder head and piston configurations were tested for the evaluation of charge motion, combustion chamber geometry and compression ratio, which was varied from 11.8 to 16.5. The engine displacement of the single-cylinder-research-engine of 2 dm3 represents a typical heavy-duty size. Four different combustion concepts of natural gas were realized and analysed, namely, spark ignition compressed natural gas stoichiometric, spark ignition compressed natural gas lean burn, Diesel pilot ignition compressed natural gas lean burn and Diesel pilot ignition compressed natural gas/H2-mixture lean burn. For the compressed natural gas/H2 gas mixture, it is also referred to as hythane. These concepts were compared concerning thermodynamic behaviour and emissions. Therefore, a part load point and a high load point were chosen for evaluation, since these are of special interest for heavy-duty emissions legislation. The focus of the investigation is put on a thermodynamic loss analysis, which allows the subdivision of losses starting at the ideal engine. The losses of a natural gas engine show significant differences to those of a Diesel engine, which are taken as reference. As requirement for the combustion concepts, the fulfilment of the emissions legislation EURO VI under the consideration of realistic conversion rates of an exhaust aftertreatment system had to be guaranteed. Additionally, sufficiently stable combustion was required. The engine efficiency was then optimized under these boundaries. For the investigation of the Diesel pilot ignition concept, five parameters were defined for variation which are air–fuel ratio, exhaust gas recirculation-rate, mass fraction burnt 50% hythane proportion and the hythane composition.

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Comparative Optical and Thermodynamic Investigations of High Frequency Corona- and Spark-Ignition on a CV Natural Gas Research Engine Operated with Charge Dilution by Exhaust Gas Recirculation

Marko

König

Schöffler

et al. 2016

Ignition Systems for Gasoline Engines

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Stoichiometric Natural Gas Combustion in a Single Cylinder SI Engine and Impact of Charge Dilution by Means of EGR

Cited by 14 publications

References 12 publications

Validation of turbulent flame speed models for methane–air-mixtures at high pressure gas engine conditions

Validation of turbulent flame speed models for methane–air-mixtures at high pressure gas engine conditions

Thermodynamic investigation of different natural gas combustion processes on the basis of a heavy-duty engine

Comparative Optical and Thermodynamic Investigations of High Frequency Corona- and Spark-Ignition on a CV Natural Gas Research Engine Operated with Charge Dilution by Exhaust Gas Recirculation

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