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Advanced Ignition Modelling for Pre-chamber Combustion in Lean Burn Gas Engines

Shapiro, Evgeniy; Ahmed, Irufan; Tiney, Nick


Lean burn combustion systems present a viable route to emissions reductions. However, sustainable and conrolled combustion of lean mixtures can be challenging. Scavenged pre-chamber ignition systems aim to address this challenge by creating favourable ignition conditions close to stoichiometry in the spark region. The main lean charge ignition is then delivered by flame jets propagating through the nozzles connecting the pre-chamber to the cylinder. Accurate and fast CFD modelling of the mixture formation and early flame kernel development in the pre-chamber are essential for the design of such systems. The initial stages of ignition in spark-ignited engines typically occur at time scales, temperatures and length scales falling outside of the remit of conventional CFD techniques prompting development of specialised ignition models. A review of the models currently available highlighted a gap in the technology currently available in commercial CFD codes. Simplistic models based on direct energy transfer or fixed temperature kernel development are readily available but these models to not provide an accurate representation of the spark growth. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000088322
Veröffentlicht am 08.06.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Kolbenmaschinen (IFKM)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2018
Sprache Englisch
Identifikator ISBN: 978-3-8169-3449-3
KITopen-ID: 1000088322
Erschienen in Ignition Systems for Gasoline Engines : 4th International Conference, December 6 - 7, 2018, Berlin, Germany. Ed.: M. Günther
Verlag expert-Verlag
Seiten 104-121
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