Modeling of thermal and kinetic processes in non-equilibrium plasma ignition applied to a lean combustion engine

Zembi, Jacopo; Cruccolini, Valentino; Mariani, Francesco; Scarcelli, Riccardo; Battistoni, Michele

doi:10.1016/j.applthermaleng.2021.117377

Modeling of thermal and kinetic processes in non-equilibrium plasma ignition applied to a lean combustion engine

Journal Article · Sat Jul 24 00:00:00 EDT 2021 · Applied Thermal Engineering

DOI:https://doi.org/10.1016/j.applthermaleng.2021.117377· OSTI ID:1839952

Zembi, Jacopo ^[1]; Cruccolini, Valentino ^[1]; Mariani, Francesco ^[1]; Scarcelli, Riccardo ^[2]; Battistoni, Michele ^[1]

Univ. degli Studi di Perugia (Italy)
Argonne National Lab. (ANL), Argonne, IL (United States)

In recent years novel ignition systems have been developed to enable stable and efficient engine operations with lean mixtures. Among them, radio-frequency corona ignition systems create discharges that involve a much wider region compared to traditional spark, and produce non equilibrium plasma with high levels of active radicals and excited species. These devices considerably increase the early flame growth speed and extend stable operating limits. With the aim of expanding the knowledge on high efficiency lean-burn SI engines, this paper investigates and compares the combustion development generated by spark and corona ignitions through computational fluid dynamics, within the Reynolds-Averaged Navier-Stokes framework for turbulence modeling. In order to simultaneously take thermal and chemical effects into account, the Perfectly Stirred Reactor combustion model is used. Experimental data are also collected for validation in an optical access engine, for different mixture levels, from stoichiometric to very lean. Furthermore, the faster burn rate generated by the corona system in the initial stage of the combustion is well predicted by the simulations, in all the relative air-fuel ratio conditions. Remarkably, as the mixture becomes lean, simulations are able to capture the non-linear transition from fast to slow kernel growth, before a self-sustainable flame propagation is established. This correlates very well with the measured engine cyclic variability and the corresponding steep change in the duration of the flame kernel formation. Ultimately, this study highlights the important role of the atomic oxygen, as active radical, in promoting and enhancing the combustion initiated by a corona discharge, in addition to the volumetric ignition effect. By contrast, the validated simulations allow to explain that the high-temperature thermal plasma generated in a traditional spark discharge is insensitive to kinetic aspects.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1839952

Alternate ID(s):: OSTI ID: 1815264
OSTI ID: 23187827

Journal Information:: Applied Thermal Engineering, Journal Name: Applied Thermal Engineering Vol. 197; ISSN 1359-4311

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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42 ENGINEERING
CFD simulations
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Modeling of thermal and kinetic processes in non-equilibrium plasma ignition applied to a lean combustion engine

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