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Jet ignition prediction in a zero-dimensional pre-chamber engine model

Malé, Quentin and Vermorel, Olivier and Ravet, Frédéric and Poinsot, Thierry Jet ignition prediction in a zero-dimensional pre-chamber engine model. (2021) International Journal of Engine Research (May). 1-16. ISSN 1468-0874

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Official URL: https://doi.org/10.1177/14680874211015002

Abstract

This paper presents a multi-chamber, multi-zone engine model to predict the ignition of a lean main chamber by a pre- chamber. The two chambers are connected by small cylindrical holes: the flame is ignited in the pre-chamber, hot gases propagate through the holes and ignite the main chamber through Turbulent Jet Ignition (TJI). The model original fea- tures are: (i) separate balance equations for the pre- and main chambers, (ii) a specific model for temperature and com- position evolution in the holes and (iii) a DNS-based model to predict the ignition of the main chamber fresh gases by the burnt gases turbulent jets exiting the holes. Chemical reactions during TJI are the result of two competing mixing processes: (1) the hot jet gases mix with the fresh main chamber to produce heated zones and (2) at the same time, these hot gases cool down. (1) increases combustion and leads to ignition while (2) decreases it and can prevent ignition. The overall outcome (ignition or failure) is too complex to be modelled simply and the present model relies on recent DNSs of TJI which provided a method to predict the occurrence of ignition. Incorporating this DNS information into the engine model allows to predicts whether ignition will occur or not, an information which is not accessible otherwise using simple models. The resulting approach is tested on multiple cases to predict ignition limits for very lean cases, effects of H2 injection into the pre-chamber and optimum size for the holes connecting the two chambers as a function of equivalence ratio.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Centre Européen de Recherche et Formation Avancées en Calcul Scientifique - CERFACS (FRANCE)
Other partners > Renault SAS (FRANCE)
Laboratory name:
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Deposited On:04 Oct 2021 09:11

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