Numerical and experimental evaluation of the passive pre-chamber concept for future CNG SI engines

Payri, R.; Novella, R.; Barbery, I.; Bori-Fabra, O.

doi:10.1016/j.applthermaleng.2023.120754

Cited by 21 publications

(3 citation statements)

References 42 publications

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“…The lean burn limit is extended from λ = 1.4 to λ = 2.0, and the engine combustion thermal efficiency is increased by 5.4%, while the NO x emission is significantly reduced. Payri et al 20 developed a new type of spark ignition engine fueled with CNG and integrating the Miller cycle, together with a high compression ratio and the use of passive prechamber ignition. Compared to a conventional spark ignition engine, the fuel consumption is reduced by about 15%, and CO 2 emission is reduced by around 25% in the transient driving cycle simulations.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Operating Characteristics of the Passive and Active Prechamber Jet Ignition in a Natural Gas Engine

Yang,

Li,

Wang

et al. 2024

ACS Omega

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Prechamber jet ignition is a promising technology that enables stable ignition and fast combustion by combining thermal effects, chemical kinetics, and turbulent disturbance. The development and application of the prechamber ignition require a comprehensive and in-depth understanding of the operating characteristics of the prechamber ignition in the real engine working cycle. Therefore, numerical simulations are conducted to explore the operating performance of the prechamber ignition applied to a large-bore natural gas engine in this study. The differences between the passive prechamber (PPRE) and active prechamber (APRE) near the lean burn limit are compared. The results show that the jet ignition performance of the PPRE is hampered by the high residual gas coefficient and lean mixture in the prechamber under lean burn conditions. The ignition mode of the PPRE is similar to torch ignition, and the combustion process in the main chamber is mainly turbulent flame propagation. The ignition mechanism of the APRE is flame jet ignition. The main chamber combustion process presents a two-stage heat release characteristic, which can be subdivided into three phases: the initial flame development phase, the rapid combustion phase, and the late combustion phase. The heat release rate during the initial flame development phase depends on the physical and chemical properties of the prechamber jet and the mixture conditions in the main chamber. During the rapid combustion phase, the flame propagation along the radial direction of the jet largely depends on the time scale of the chemical reaction. The heat release rate depends on the coverage area of the jet, the jet residual momentum, and the turbulent flame speed. During the late combustion phase, the flame propagation is mainly affected by the turbulent flame speed. These results provide theoretical guidance for the subsequent application of prechamber ignition systems in various powertrains.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Operating Characteristics of the Passive and Active Prechamber Jet Ignition in a Natural Gas Engine

Yang,

Li,

Wang

et al. 2024

ACS Omega

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“…The introduction of passive pre-chamber ignition technology in CNG fueled spark ignition engine successfully addresses the issue of lower laminar flame speed in CNG and achieve enhanced indicated efficiency in contrast to baseline gasoline engines [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Carbon taxation on high utility transport fuels: An implementation of enviro-economic analysis for the sustainable environment”

Usman,

Malik,

Nabi

et al. 2024

Heliyon

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“…In recent years, different technologies for improving thermal efficiency have been proposed, such as cooled exhaust gas recirculation (EGR), direct injection, high-energy ignition, lean-burning, miller cycle combined with high compression ratio, pre-chamber (PC), etc. [6][7][8]. The lean-burning technology is considered a promising solution, thanks to its higher specific heat ratio and lower auto-ignition tendencies.…”

Section: Introductionmentioning

confidence: 99%

Nozzle Design of Plug-and-Play Passive Pre-Chamber Ignition Systems for Natural Gas Engines

Li,

Ma,

Zhu

et al. 2023

Applied Sciences

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To evaluate the significance of the geometrical parameters of a passive pre-chamber on engine performance, this study investigated the design of a plug-and-play passive pre-chamber in a 15 L heavy-duty natural gas engine. Multi-dimensional numerical investigations were conducted for parametric studies involving lateral angle, orifice diameter, and vertical angle. A compressive flow solver was employed for Navier–Stoke equations, coupled with detailed sub-models and a chemical kinetic scheme. The combustion model was calibrated and could well predict the engine combustion and operating performance. Seven pre-chamber schemes were evaluated, and four optimal ones were selected for experimental tests. The characteristics of the scavenging process, turbulent jet ignition, and main-chamber combustion were investigated and analyzed. The results show that, considering the trade-off between the ignition energy and the scavenging efficiency, the ratio of the pre-chamber to clearance volume is recommended to be 0.2~0.7%, and the corresponding area–volume ratio is 0.003~0.006 mm−1. Compared with the original natural gas engine, the pre-chamber retrofit can save up to 13.2% of fuel consumption, which presents a significant improvement in fuel economy.

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Numerical and experimental evaluation of the passive pre-chamber concept for future CNG SI engines

Cited by 21 publications

References 42 publications

Numerical Investigation of the Operating Characteristics of the Passive and Active Prechamber Jet Ignition in a Natural Gas Engine

Numerical Investigation of the Operating Characteristics of the Passive and Active Prechamber Jet Ignition in a Natural Gas Engine

Carbon taxation on high utility transport fuels: An implementation of enviro-economic analysis for the sustainable environment”

Nozzle Design of Plug-and-Play Passive Pre-Chamber Ignition Systems for Natural Gas Engines

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