Effect of passive pre-chamber orifice diameter on the methane combustion process in an optically accessible SI engine

Antolini, Jácson; Sementa, Paolo; Tornatore, Cinzia; Catapano, Francesco; Vaglieco, Bianca Maria; Desantes, J.M.; López, J. Javier

doi:10.1016/j.fuel.2022.126990

Cited by 21 publications

(4 citation statements)

References 39 publications

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“…Antolini et al [36] evaluated the effect of the orifice diameter of the prechamber on the jet and combustion characteristics. The experiment was performed on a single-cylinder SI optical engine.…”

Section: Literature Reviewmentioning

confidence: 99%

Numerical investigation of a GDI engine with pre-combustion Chamber

2023

IJATEE

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The rules and regulations on greenhouse gas and pollutant emissions are exerting enormous stress on the automobile sector [1]. To attain the long-term fleet goal of 50g carbon dioxide (CO 2 )/km for modern automobile drivetrains, light-duty vehicle propulsion systems are undergoing significant modifications from purely thermal engines to more electric powertrains [2]. Consequently, it is anticipated that the internal combustion engine (ICE) will continue to be a component of the drivetrain in the coming years. *Author for correspondenceThe key advancements based on the engine efficiency improvement, advanced after-treatment systems, low carbon fuels, and predictive control strategies are being developed [3]. Due to stringent pollution rules, spark ignition (SI) engines are gaining market share in the automobile sector, especially in the passenger and light-duty vehicle segments [4]. However, the efficiency and load-carrying capacity of the SI engine are inferior to that of its counterpart compression ignition (CI) engine due to its operation with a lower compression ratio (CR) [5]. Since peak efficiencies of greater than 45% have been consistently cited as desired values from gasoline engines, substantially decreasing the fuel consumption of gasoline engines

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Section: Literature Reviewmentioning

confidence: 99%

Numerical investigation of a GDI engine with pre-combustion Chamber

2023

IJATEE

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“…For prechamber ignition engines, many factors have great influences on the jet ignition process and engine performance, including the physical and chemical properties of the mixture, prechamber geometry, ignition parameters, combustion chamber shape, engine operating parameters, and so on. − Antolini et al investigated the jet characteristics and combustion in the main chamber with different orifice diameters based on an optically accessible single-cylinder spark engine. In all test conditions, the prechamber with a 1.2 mm orifice diameter had the shortest flame development duration, while the prechamber with a 1.0 mm orifice diameter presented the shortest combustion duration of the main chamber.…”

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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“…Liu [27] assessed the effects of the PC on combustion characteristics under lean-burning conditions and found that a larger PC volume allowed faster pressure buildup but led to higher heat transfer losses. Antolini [28] evaluated the effect of orifice diameter on the jet characteristics and main chamber (MC) combustion in an optically accessible single-cylinder SI engine. High-speed broadband chemiluminescence imaging was used to track the jet penetration and flame front propagation.…”

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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Effect of passive pre-chamber orifice diameter on the methane combustion process in an optically accessible SI engine

Cited by 21 publications

References 39 publications

Numerical investigation of a GDI engine with pre-combustion Chamber

Numerical investigation of a GDI engine with pre-combustion Chamber

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

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

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