Experimental and numerical investigations of the unscavenged prechamber combustion in a rapid compression and expansion machine under engine-like conditions

Xu, Guiqing; Kotzagianni, Maria; Kyrtatos, Panagiotis; Wright, Yuri M.; Boulouchos, Konstantinos

doi:10.1016/j.combustflame.2019.01.025

Cited by 77 publications

(24 citation statements)

References 59 publications

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“…In the project described here, a consortium has established fundamental understanding of the processes in a small methane-fueled prechamber using experimental 42,43 and numerical methods 34,44–46 to design and choose an appropriate prechamber with the possibility of auxiliary fueling for a passenger-car-sized natural gas engine. 47–51 Those findings have been implemented into a four-cylinder engine and this article gives the full engine map characterization of the results.…”

Section: Introductionmentioning

confidence: 99%

Efficient light-duty engine using turbulent jet ignition of lean methane mixtures

Soltic

Hilfiker

Hänggi

2019

International Journal of Engine Research

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Diesel engines use diffusion-controlled combustion of a high-reactivity fuel and offer high efficiencies because they combine lean combustion with a high compression ratio. For low-reactivity fuels such as gasoline or natural gas, premixed combustion is used, which leads to lower efficiency levels as usually stoichiometric combustion is combined with lower compression ratios. Trying to apply diesel-like process parameters to low-reactivity fuels inevitably leads to problems with classical spark ignition systems as they are not able to establish robust flame propagation for such hard-to-ignite conditions. One possibility to enable fast combustion for diluted mixtures at high pressure levels is to establish ignition in a prechamber and ignite the charge of the main combustion chamber using the turbulent jets exiting the prechamber. In this study, the experimental results of a prechamber-equipped four-cylinder natural gas engine with 2 L displacement are discussed in detail. In the majority of the engine map, auxiliary fueling is used in the prechamber and a global air–fuel equivalence ratio λ is set to 1.7. At full load, a λ of 1.5 is applied without auxiliary prechamber fueling. The experiments show that such a setup is able to achieve brake efficiency levels of above 45% while maintaining peak brake mean effective pressure levels above 20 bar. At high load conditions, cylinder pressure levels at ignition timing achieve more than 80 bar and cylinder peak pressures of around 180 bars occur. The technology proved to enable robust and very fast combustion at comparably low NOx levels. A remaining challenge for the on-road use of such a technology is the reduction of the methane emissions at lean conditions.

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Section: Introductionmentioning

confidence: 99%

Efficient light-duty engine using turbulent jet ignition of lean methane mixtures

Soltic

Hilfiker

Hänggi

2019

International Journal of Engine Research

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“…Such results can be obtained in research using an RCEM without typical cranking system [e.g. 21,43].…”

Section: Injection Of Gasoline With Other Fuelsmentioning

confidence: 70%

Effects of mixture formation strategies on combustion in dual-fuel engines – a review

Pielecha¹,

Sidorowicz²

2021

Combustion Engines

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The article presents an overview of technical solutions for dual fuel systems used in internal combustion engines. It covers the historical and contemporary genesis of using two fuels simultaneously in the combustion process. The authors pay attention to the value of the excess air coefficient in the cylinder, as the ignitability of the fuel dose near the spark plug is a critical factor. The mixture formation of compression ignition based systems are also analyzed. The results of research on indirect and direct injection systems (and their combinations) have been presented. Research sections were separated based to the use of gasoline with other fuels or diesel oil with other fuels. It was found that the use of two fuels in different configurations of the fuel supply systems extends the conditions for the use of modern combustion systems (jet controlled compression ignition, reactivity controlled compression ignition, intelligent charge compression ignition, premixed charge compression ignition), which will enable further improvement of combustion efficiency.

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“…In order to realize engine-like high pressure/temperature conditions by compressing and expanding fuel/air mixtures through imitating the piston motion and to study the temporal and spatial evolution of the turbulent jet ignition process, rapid compression machines (RCM) or rapid compression and expansion machines (RCEM) have also been used in prechamber-related studies (Gholamisheeri, 2016(Gholamisheeri, , 2017Xu, 2019;Tanoue, 2017).…”

Section: Introductionmentioning

confidence: 99%

Effect of fuel property on the ignition and combustion characteristics of prechamber ignition

Yamashita

Waku

Mori

et al. 2021

JTST

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Experimental and numerical investigations of the unscavenged prechamber combustion in a rapid compression and expansion machine under engine-like conditions

Cited by 77 publications

References 59 publications

Efficient light-duty engine using turbulent jet ignition of lean methane mixtures

Efficient light-duty engine using turbulent jet ignition of lean methane mixtures

Effects of mixture formation strategies on combustion in dual-fuel engines – a review

Effect of fuel property on the ignition and combustion characteristics of prechamber ignition

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