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Title: Extending lean operating limit and reducing emissions of methane spark-ignited engines using a microwave-assisted spark plug

Abstract

A microwave-assisted spark plug was used to extend the lean operating limit (lean limit) and reduce emissions of an engine burning methane-air. In-cylinder pressure data were collected at normalized air-fuel ratios of λ = 1.46, λ = 1.51, λ = 1.57, λ = 1.68, and λ = 1.75. For each λ , microwave energy (power supplied to the magnetron per engine cycle) was varied from 0 mJ (spark discharge alone) to 1600 mJ. At lean conditions, the results showed adding microwave energy to a standard spark plug discharge increased the number of complete combustion cycles, improving engine stability as compared to spark-only operation. Addition of microwave energy also increased the indicated thermal efficiency by 4% at λ = 1.68. At λ = 1.75, the spark discharge alone was unable to consistently ignite the air-fuel mixture, resulting in frequent misfires. Although microwave energy produced more consistent ignition than spark discharge alone at λ = 1.75, 59% of the cycles only partially burned. Overall, the microwave-assisted spark plug increased engine performance under lean operating conditions (λ = 1.68) but did not affect operation at conditions closer to stoichiometric.

Authors:
; ; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1198312
Resource Type:
Published Article
Journal Name:
Journal of Combustion
Additional Journal Information:
Journal Name: Journal of Combustion Journal Volume: 2012; Journal ID: ISSN 2090-1968
Publisher:
Hindawi Publishing Corporation
Country of Publication:
Country unknown/Code not available
Language:
English

Citation Formats

Rapp, Vi H., DeFilippo, Anthony, Saxena, Samveg, Chen, Jyh-Yuan, Dibble, Robert W., Nishiyama, Atsushi, Moon, Ahsa, and Ikeda, Yuji. Extending lean operating limit and reducing emissions of methane spark-ignited engines using a microwave-assisted spark plug. Country unknown/Code not available: N. p., 2012. Web. doi:10.1155/2012/927081.
Rapp, Vi H., DeFilippo, Anthony, Saxena, Samveg, Chen, Jyh-Yuan, Dibble, Robert W., Nishiyama, Atsushi, Moon, Ahsa, & Ikeda, Yuji. Extending lean operating limit and reducing emissions of methane spark-ignited engines using a microwave-assisted spark plug. Country unknown/Code not available. doi:10.1155/2012/927081.
Rapp, Vi H., DeFilippo, Anthony, Saxena, Samveg, Chen, Jyh-Yuan, Dibble, Robert W., Nishiyama, Atsushi, Moon, Ahsa, and Ikeda, Yuji. Sun . "Extending lean operating limit and reducing emissions of methane spark-ignited engines using a microwave-assisted spark plug". Country unknown/Code not available. doi:10.1155/2012/927081.
@article{osti_1198312,
title = {Extending lean operating limit and reducing emissions of methane spark-ignited engines using a microwave-assisted spark plug},
author = {Rapp, Vi H. and DeFilippo, Anthony and Saxena, Samveg and Chen, Jyh-Yuan and Dibble, Robert W. and Nishiyama, Atsushi and Moon, Ahsa and Ikeda, Yuji},
abstractNote = {A microwave-assisted spark plug was used to extend the lean operating limit (lean limit) and reduce emissions of an engine burning methane-air. In-cylinder pressure data were collected at normalized air-fuel ratios of λ = 1.46, λ = 1.51, λ = 1.57, λ = 1.68, and λ = 1.75. For each λ, microwave energy (power supplied to the magnetron per engine cycle) was varied from 0 mJ (spark discharge alone) to 1600 mJ. At lean conditions, the results showed adding microwave energy to a standard spark plug discharge increased the number of complete combustion cycles, improving engine stability as compared to spark-only operation. Addition of microwave energy also increased the indicated thermal efficiency by 4% at λ = 1.68. At λ = 1.75, the spark discharge alone was unable to consistently ignite the air-fuel mixture, resulting in frequent misfires. Although microwave energy produced more consistent ignition than spark discharge alone at λ = 1.75, 59% of the cycles only partially burned. Overall, the microwave-assisted spark plug increased engine performance under lean operating conditions (λ = 1.68) but did not affect operation at conditions closer to stoichiometric.},
doi = {10.1155/2012/927081},
journal = {Journal of Combustion},
number = ,
volume = 2012,
place = {Country unknown/Code not available},
year = {2012},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1155/2012/927081

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