Investigate chemical effects of pre-chamber combustion products on main chamber ignition performance under an ultra-lean condition

Wenxian Tang, Mani Sarathy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Pre-chamber ignition systems are considered as an effective technique to achieve an ultra-lean burn combustion. Hot combustion products and flames generated from pre-chamber combustion create high-speed turbulent jets, which ignite an ultra-lean mixture in the main chamber. This turbulent ignition can be classified as a jet and flame ignition process with thermal and chemical kinetic effects imposed on the main chamber by the pre-chamber. The purpose of this paper is to investigate the chemical effects of pre-chamber combustion products on main chamber ignition performance over a range of operating conditions in pre-chamber. A zero-dimensional pre-chamber combustion model was developed using CHEMKIN-PRO software. By varying the equivalence ratio of reactants, simulation results indicated that the pre-chamber generated more active radicals when burning around stoichiometric conditions but more low-carbon species when burning in rich conditions. Therefore, rapid ignition performance was observed in the ultra-lean mixture of main chamber with additional combustion products from the pre-chamber burning with a stoichiometric mixture. This contributed to the transfer of highly active species especially OH radicals from pre-chamber into main chamber. Heat release rate and laminar flame speed are promoted with combustion products from pre-chamber burning with a relatively rich mixture. The related reaction and species sensitivity analysis were also conducted to explain the above findings.
Original languageEnglish (US)
Title of host publicationSAE Technical Paper Series
PublisherSAE International
DOIs
StatePublished - Sep 16 2020

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