Exploring the lean limit operation and fuel consumption improvement of a homogeneous charge pre-chamber torch ignition system in an SI engine fueled with a gasoline-bioethanol blend

Costa, Roberto Berlini Rodrigues da; Filho, Fernando Antônio Rodrigues; Moreira, T. A. A.; Baêta, José Guilherme Coelho; Guzzo, Márcio Expedito; Souza, José Leôncio Fonseca de

doi:10.1016/j.energy.2020.117300

Cited by 25 publications

(5 citation statements)

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“…The second option includes a prechamber in addition to the main combustion chamber (right side of Figure 1), and is typically used in engines with power ratings greater than 2 MW (larger pistons, larger diameter, requires stronger torches). The spark plug is placed in the prechamber and the prechamber may be active, i.e., a chamber into which gas is injected, or it may be passive, i.e., without injection, in which case the same mixture present in the combustion chamber is introduced into the prechamber [10,11]. In the first case, pure gas is introduced into the prechamber so that when the spark is generated, the inside of the prechamber contains an AFR close to the stoichiometric AFR.…”

Section: Introductionmentioning

confidence: 99%

Methodological Design Optimization of a Marine LNG Internal Combustion Gas Engine to Burn Alternative Fuels

Zardoya¹,

Bengoetxea²,

Martínez³

et al. 2023

JMSE

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Marine emission policies are becoming more demanding; thus, ship propulsion and power generation technologies need to be adapted to current scenarios. LNG is already considered to be a transition fuel, and new alternative marine fuels are emerging. The aim of this study was to develop an innovative methodology to optimize and adapt the combustion system of an LNG internal combustion marine engine to burn alternative marine fuels. The present study was based on LBG, but the methodology could be replicated with other fuels. A total of six tests were carried out, with three prechamber designs and three spark plug designs. Each test was carried out in a single-cylinder engine with two types of high-methane-number fuel. The influence on thermal efficiency parameters such as the prechamber volume, the orientation of the flame holes, and the existence of a central hole was studied. In the case of the spark plug, the influence of the amount of precious metal in the electrode, its shape and its insertion into the prechamber were analysed. Experiments showed that by modifying both the prechamber and the spark plug, maximum improvements in thermal efficiency of 1.9% can be achieved. Those improvements allowed the LBG engine to suffer only a 4.3% thermal efficiency reduction, as opposed to its LNG counterpart. By applying the proposed methodology, the thermal efficiency of commercially available internal combustion gas engines could be improved.

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Section: Introductionmentioning

confidence: 99%

Methodological Design Optimization of a Marine LNG Internal Combustion Gas Engine to Burn Alternative Fuels

Zardoya¹,

Bengoetxea²,

Martínez³

et al. 2023

JMSE

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“…This torch flame propagation is the ordinary behavior in commercial gas engines. In this type of engine, the two chambers are called the pre-chamber (PC) and the main chamber (MC) [19]. Usually, the pre-chamber volume is around 2% of the main chamber.…”

Section: Introductionmentioning

confidence: 99%

An investigation on the behavior of the torch flame in the LBGE combustion process

Abdelhameed¹,

Tashima²

2022

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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Fuel conversion from heavy fuel oil (HFO) to LNG-based fuel, of which the main component is methane, is considered a suitable and practical solution. Most LBGEs adopt the pre-chamber (PC) configuration that can promote premixture combustion in the Main Combustion Chamber (MC) thanks to torch flame ejection from the orifice holes of the PC. However, the PC is sometimes specified as a starting point of the pre-ignition phenomenon that is a significant obstacle for Lean Burn Gas Engines (LBGEs) to improve their thermal efficiency. Too strong ejection may result in a misfire of the premixture MC and a considerable cyclic variation of the MC combustion. In this study, detailed observation of the combustion process was done in LBGE-simulating devices focusing on the ejection behaviors of the torch flame to clarify the source of the abnormal combustion and the cyclic variation of combustion processes.

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“…13,14 In contrast, the lean fuel-air mixture combustion due to the reduced reactivity and lower flame speed of the lean fuel-air mixture leads to a longer combustion delay as well as incomplete combustion. 12,15 Further, the amount of unburnt hydrocarbon (HC) emission can increase in the case of the lean-burn combustion process. 16 In these conditions, burning a homogeneous lean mixture with the prechamber seems an attractive solution to extend the current limits of lean combustion.…”

Section: Introductionmentioning

confidence: 99%

Improvement of performance and emission in a lean‐burn gas fueled spark ignition engine by using a new pre‐chamber

Kheyrollahi

Jafarmadar

Khalilarya

et al. 2021

Env Prog and Sustain Energy

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Lean burn combustion of natural gas in spark-ignited engines is a promising approach to improving engine performance and efficiency by reducing pollutant emissions and better fuel consumption. However, inducing excessive lean mixture to the engine makes the combustion unstable, and misfire happens in a significant number of cycles. The pre-chamber ignition technology is a useful solution that can make sparkignition engines more efficient. In this study, the lean mixture's combustion was empirically investigated with a new pre-chamber spark plug in a one-cylinder engine fueled with natural gas. Tests were performed at 11.5, 13.5, and 16 compression ratios and a wide range of air-fuel ratios. With the pre-chamber spark plug usage, the lean operating limit is enlarged by 10%-45% and gives 4% and 3% the average lower in-cylinder pressure and exhaust gas temperature than the conventional spark ignition system. The brake-specific fuel consumption was improved by 4%-11% using the pre-chamber spark ignition. The HC, CO, and NOx formation is about 11%, 16.3%, and 10% lower than the conventional spark ignition usage. Outcomes confirmed that the new design pre-chamber plug gives 1% improved COV IMEP than the standard spark plug. The use of pre-chamber due to the lean-burn combustion causes larger ignition delay and increases brake thermal efficiency by up to 9%. It can be concluded that the pre-chamber increases the ignition ability, and the lean mixture limit is extended.

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Exploring the lean limit operation and fuel consumption improvement of a homogeneous charge pre-chamber torch ignition system in an SI engine fueled with a gasoline-bioethanol blend

Cited by 25 publications

References 50 publications

Methodological Design Optimization of a Marine LNG Internal Combustion Gas Engine to Burn Alternative Fuels

Methodological Design Optimization of a Marine LNG Internal Combustion Gas Engine to Burn Alternative Fuels

An investigation on the behavior of the torch flame in the LBGE combustion process

Improvement of performance and emission in a lean‐burn gas fueled spark ignition engine by using a new pre‐chamber

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