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Title: Multi-dimensional modeling of non-equilibrium plasma for automotive applications

Abstract

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 importantmore » 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.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technology
OSTI Identifier:
1501872
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 2018 SAE World Congress Experience, 04/10/18 - 04/12/18, Detroit, MI, US
Country of Publication:
United States
Language:
English

Citation Formats

Scarcelli, Riccardo, Zhang, Anqi, Wallner, Thomas, Breden, Douglas, Karpatne, Anand, Raja, Laxminarayan, Ekoto, Isaac, and Wolk, Benjamin. Multi-dimensional modeling of non-equilibrium plasma for automotive applications. United States: N. p., 2018. Web. doi:10.4271/2018-01-0198.
Scarcelli, Riccardo, Zhang, Anqi, Wallner, Thomas, Breden, Douglas, Karpatne, Anand, Raja, Laxminarayan, Ekoto, Isaac, & Wolk, Benjamin. Multi-dimensional modeling of non-equilibrium plasma for automotive applications. United States. doi:10.4271/2018-01-0198.
Scarcelli, Riccardo, Zhang, Anqi, Wallner, Thomas, Breden, Douglas, Karpatne, Anand, Raja, Laxminarayan, Ekoto, Isaac, and Wolk, Benjamin. Tue . "Multi-dimensional modeling of non-equilibrium plasma for automotive applications". United States. doi:10.4271/2018-01-0198.
@article{osti_1501872,
title = {Multi-dimensional modeling of non-equilibrium plasma for automotive applications},
author = {Scarcelli, Riccardo and Zhang, Anqi and Wallner, Thomas and Breden, Douglas and Karpatne, Anand and Raja, Laxminarayan and Ekoto, Isaac and Wolk, Benjamin},
abstractNote = {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.},
doi = {10.4271/2018-01-0198},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {4}
}

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