Multi-dimensional Modeling of Non-equilibrium Plasma for Automotive Applications Argonne National Laboratory

Format:

Conference/Event

Author/Creator:

Scarcelli, Scarcelli, author.

Contributor:

Breden, Douglas

Ekoto, Isaac

Karpatne, Anand

Raja, Laxminarayan

Wallner, Thomas

Wolk, Benjamin

Zhang, Anqi

Conference Name:

WCX World Congress Experience (2018-04-10 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2018

Summary:

AbstractWhile 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

Notes:

Vendor supplied data

Publisher Number:

2018-01-0198

Access Restriction:

Restricted for use by site license