Effect of microwave pulse parameters on energy coupling and enhancement of microwave assisted ignition

Wu, H; Wang, Z; Cheng, X; Huang, Y; Chen, JY; Liu, C; Wang, Z; Xu, J; Zhang, X

Effect of microwave pulse parameters on energy coupling and enhancement of microwave assisted ignition

Wu, H Wang, Z Cheng, X Huang, Y

Chen, JY Liu, C Wang, Z Xu, J Zhang, X

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Proceedings of the Combustion Institute, 2022
Issue Date:: 2022-01-01

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Field	Value	Language
dc.contributor.author	Wu, H
dc.contributor.author	Wang, Z
dc.contributor.author	Cheng, X
dc.contributor.author	Huang, Y https://orcid.org/0000-0001-9800-8788
dc.contributor.author	Chen, JY
dc.contributor.author	Liu, C
dc.contributor.author	Wang, Z
dc.contributor.author	Xu, J
dc.contributor.author	Zhang, X
dc.date.accessioned	2022-10-11T06:23:45Z
dc.date.available	2022-10-11T06:23:45Z
dc.date.issued	2022-01-01
dc.identifier.citation	Proceedings of the Combustion Institute, 2022
dc.identifier.issn	1540-7489
dc.identifier.uri	http://hdl.handle.net/10453/162481
dc.description.abstract	Microwave Assisted Ignition (MAI) is a promising technology to optimize the lean combustion characteristics of internal combustion engines. This research investigated the effects of microwave pulse waveform and delay time on energy coupling and ignition enhancement by using a power diagnostic with high time-resolution. The pulse width ranged from 80 to 200 μs and the corresponding peak power was adjusted between 1000 and 400 W to keep the incident energy of microwave pulse constant. Results showed that a high power and short width pulse waveform was conducive to the microwave energy absorption. The coupled energy generally decreased with delay time. There was a significant ignition enhancement with only 6-7 mJ energy coupled into the flame kernel, which was approximately 1/5 of total spark energy. Moreover, the ignition enhancement was well correlated with the coupled energy, suggesting that ignition enhancement was determined by coupled energy via electron collision reactions. Finally, the main influencing factor of coupled energy was the energy coupling pattern which changed from none-coupling to saturated coupling. A high pulse power and short delay time facilitated this change. This study revealed the saturated coupling pattern independent of waveform and delay time, which is caused by a stable electron number density due to the cut-off effect.
dc.language	en
dc.publisher	Elsevier BV
dc.relation.ispartof	Proceedings of the Combustion Institute
dc.relation.isbasedon	10.1016/j.proci.2022.07.059
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	0902 Automotive Engineering, 0904 Chemical Engineering, 0913 Mechanical Engineering
dc.title	Effect of microwave pulse parameters on energy coupling and enhancement of microwave assisted ignition
dc.type	Journal Article
utslib.for	0902 Automotive Engineering
utslib.for	0904 Chemical Engineering
utslib.for	0913 Mechanical Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2024-08-01T00:00:00+1000Z
dc.date.updated	2022-10-11T06:23:44Z
pubs.publication-status	Published

Abstract:

Microwave Assisted Ignition (MAI) is a promising technology to optimize the lean combustion characteristics of internal combustion engines. This research investigated the effects of microwave pulse waveform and delay time on energy coupling and ignition enhancement by using a power diagnostic with high time-resolution. The pulse width ranged from 80 to 200 μs and the corresponding peak power was adjusted between 1000 and 400 W to keep the incident energy of microwave pulse constant. Results showed that a high power and short width pulse waveform was conducive to the microwave energy absorption. The coupled energy generally decreased with delay time. There was a significant ignition enhancement with only 6-7 mJ energy coupled into the flame kernel, which was approximately 1/5 of total spark energy. Moreover, the ignition enhancement was well correlated with the coupled energy, suggesting that ignition enhancement was determined by coupled energy via electron collision reactions. Finally, the main influencing factor of coupled energy was the energy coupling pattern which changed from none-coupling to saturated coupling. A high pulse power and short delay time facilitated this change. This study revealed the saturated coupling pattern independent of waveform and delay time, which is caused by a stable electron number density due to the cut-off effect.

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http://hdl.handle.net/10453/162481