Numerical analysis of the passive pre-chamber ignition concept for light duty applications

Novella, Ricardo; Gómez-Soriano, Josep; Barbery, I.; Libert, C.

doi:10.1016/j.applthermaleng.2022.118610

Cited by 31 publications

(1 citation statement)

References 49 publications

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“…According to literature studies, the pressure difference between the pre-chamber and main chamber acts as the primary driving force for the formation of pre-chamber jet and is the key factor affecting the jet penetration distance and turbulent intensity. 41–43 Consequently, the VE max and VE mean have the same law of change as HRR mean and Δ p max changing when the spark timing is retarded from 684°CA to 708°CA. However, the T mean and [yOH × 1000] mean do not change regularly with the delay of spark timing, and fluctuate up and down in a small range.…”

Section: Resultsmentioning

confidence: 92%

Effect of spark timing on the pre-chamber jet ignition in a lean-burn natural gas engine

Xue

Wang

Zhao

et al. 2023

International Journal of Engine Research

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An enhanced combustion concept, pre-chamber jet ignition can provide high ignition energy and a wide dispersion of ignition sources, thus improving combustion performance and realizing stable lean combustion. However, the ignition performance of the pre-chamber jets depends strongly on the pre-chamber combustion process and is sensitive to many factors. Therefore, this paper will explore the impact of spark timing on the pre-chamber combustion, turbulent jet characteristics, and main chamber combustion performance by CFD simulation based on an active pre-chamber natural gas engine. The in-cylinder flow and combustion processes of the engine are calculated with the fuel-air equivalence ratio of the main chamber maintained at 0.5, and the spark timing varied from 684°CA to 708°CA with a step of 3°CA (compression top dead center is 720°CA). The results show that, in the present engine operating point, the pre-chamber combustion heat release rate is improved when the spark timing is retarded from 696°CA to 705°CA, and the injection velocity of the pre-chamber jet accordingly increases. As the spark timing continues to be delayed until 708°CA, the pre-chamber combustion deteriorates, and the injection velocity of the pre-chamber jet decreases. Under the combustion phase CA50 no more than 725°CA and the combustion duration CA5-90 fixed around 30°CA, the IMEP will maintain a relatively stable value when the spark timing is delayed from 693°CA to 705°CA, in the meantime, the NOx emission decreases with the delay of spark timing. Therefore, on the premise of ensuring engine power performance, it is a feasible scheme to delay spark timing to reduce NOx emission for the natural gas engine with an active pre-chamber.

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Section: Resultsmentioning

confidence: 92%