Combustion analysis of a SI engine with stratified and homogeneous pre-chamber ignition system using ethanol and hydrogen

Santos, Nathália Duarte Souza Alvarenga; Álvarez, Carlos Eduardo Castilla; Roso, Vinícius Rückert; Baêta, José Guilherme Coelho; Valle, Ramón Molina

doi:10.1016/j.applthermaleng.2019.113985

Cited by 49 publications

(19 citation statements)

References 56 publications

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“…Moreover, the pre-chamber generates low-temperature lean-burn combustion, which can reduce the misfire rate and improve the complete combustion of natural gas and, therefore, reduce HC emissions. 17 However, the mixture goes rich; there is an increase in HC emissions due to the lack of oxygen.…”

Section: Methodsmentioning

confidence: 99%

“…The pre-chamber spark plug system promotes faster combustion than the original system. Moreover, a combination of lower burning temperature and oxygen availability in the case of the prechamber spark plug engine allows for low NOx emissions 17 and helps the engine achieve high combustion efficiency at high loads. However, NOx emission increases with the increase of operating loads because combustion temperature rises at higher loads.…”

Section: Methodsmentioning

confidence: 99%

“…16 In these conditions, burning a homogeneous lean mixture with the prechamber seems an attractive solution to extend the current limits of lean combustion. 17 The pre-chamber with a higher and faster combustion rate increases main-chamber combustion stability and engine thermal efficiency. 18 The small-sized separated chamber is considered a pre-chamber ignition system with connection holes for passing the lean mixture into the pre-chamber during the compression stroke.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…The initial tests were developed with the baseline engine, calibrated for stoichiometric conditions, and using Brazilian ethanol as fuel. In a second step, the experimental tests were performed substituting the conventional spark plug ignition system by a prechamber ignition system (PCIS) [41,42], without other mechanical changes. This system is composed of a prechamber and a main combustion chamber.…”

Section: Engine Experimental Setupmentioning

confidence: 99%

Evaluation of a stratified prechamber ignition concept for vehicular applications in real world and standardized driving cycles

et al. 2019

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“…Since the first patent of prechamber, developed by Ricardo [6], research has proven that this system is capable of operating with globally lean mixtures [7,8], rich in the prechamber and lean in the main chamber, increasing combustion speeds in lean conditions [9] and controlling the cyclic variations [10] through the high ignition energy provided by the prechamber [11,12]. Homogeneous or passive systems, where the air-fuel ratio is the same between auxiliary and main chamber, is simpler and less costly if compared to stratified or active systems, since they do not demand auxiliary systems for fuel supply.…”

Section: Introductionmentioning

confidence: 99%

The influence of volume variation in a homogeneous prechamber ignition system in combustion characteristics and exhaust emissions

Sandoval

Álvarez

Roso

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Research on prechamber ignition systems has become increasingly frequent as they promote significant reductions in engineout emissions with low cost of implementation. In these systems, the combustion starts in an auxiliary chamber and flows through the interconnecting holes, in form of jets, to the main chamber, where it ignites the air-fuel mixture contained therein. Besides the air-fuel ratio, the geometry of the prechamber presents fundamental parameters that influence combustion characteristics and, consequently, the exhaust emissions. This paper aims to evaluate the effects of prechamber volume variation in combustion and emissions of a commercial engine equipped with a homogeneous charge prechamber ignition system. For this, three volumes were considered in stationary tests of a multi-cylinder engine operating under stoichiometric conditions in 1500 rpm and 3.3 bar of IMEP. The results indicated that the increase in volume within the limits considered present increase in the energy released and, hence, in the burning speed, reducing the combustion duration. Comparing to the baseline spark plug system, the prechamber with 3.8% of the main combustion chamber volume presented the best configuration among the evaluated volumes, with an increase in the evolution of pressure traces and reductions in around 13% in unburned hydrocarbons (HC) and nitrogen oxides (NO x) engine-out emissions.

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Combustion analysis of a SI engine with stratified and homogeneous pre-chamber ignition system using ethanol and hydrogen

Cited by 49 publications

References 56 publications

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

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

Evaluation of a stratified prechamber ignition concept for vehicular applications in real world and standardized driving cycles

The influence of volume variation in a homogeneous prechamber ignition system in combustion characteristics and exhaust emissions

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