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Multi-dimensional Modeling of Non-equilibrium Plasma for Automotive Applications
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 03, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
While spark-ignition (SI) engine technology is aggressively moving towards challenging (dilute and boosted) combustion regimes, advanced ignition technologies generating non-equilibrium types of plasma are being considered by the automotive industry as a potential replacement for the conventional spark-plug technology. However, there are currently no models that can describe the low-temperature plasma (LTP) ignition process in computational fluid dynamics (CFD) codes that are typically used in the multi-dimensional engine modeling community. A key question for the engine modelers that are trying to describe the non-equilibrium ignition physics concerns the plasma characteristics. A key challenge is also represented by the plasma formation timescale (nanoseconds) that can hardly be resolved within a full engine cycle simulation.
This paper reports on the multi-dimensional modeling of LTP generated by a nanopulsed high-voltage discharge in a pin-to-pin electrode configuration, and evaluates the effects of ambient pressure on the post-discharge results. It is shown that a nanopulsed delivery can result in a LTP or a mode transition to an arc-like event depending on the mixture properties in the gap between the two electrodes.
It is further shown that numerical predictions of the LTP-to-arc transition point as a function of ambient pressure along with qualitative distributions of important radicals and temperature closely match recent experiments with identical geometry and discharge characteristics. As a result, the high-fidelity modeling effort described in this paper can be used as a key tool to deliver in-depth understanding of non-equilibrium plasmas for automotive applications and lead to the future implementation of dedicated models for ignition technologies that are based on non-equilibrium plasma physics.
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- Riccardo Scarcelli - Argonne National Laboratory
- Anqi Zhang - Argonne National Laboratory
- Thomas Wallner - Argonne National Laboratory
- Douglas Breden - Esgee Technologies
- Anand Karpatne - Esgee Technologies
- Laxminarayan Raja - University of Texas at Austin
- Isaac Ekoto - Sandia National Laboratories
- Benjamin Wolk - Tula Technology Inc
CitationScarcelli, R., Zhang, A., Wallner, T., Breden, D. et al., "Multi-dimensional Modeling of Non-equilibrium Plasma for Automotive Applications," SAE Technical Paper 2018-01-0198, 2018, https://doi.org/10.4271/2018-01-0198.
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