Effects of Injection Timing on Fluid Flow Characteristics of Partially Premixed Combustion Based on High-Speed Particle Image Velocimetry

Handle URI:
http://hdl.handle.net/10754/623677
Title:
Effects of Injection Timing on Fluid Flow Characteristics of Partially Premixed Combustion Based on High-Speed Particle Image Velocimetry
Authors:
Izadi Najafabadi, Mohammad; Tanov, Slavey; Wang, Hua; Somers, Bart; Johansson, Bengt; Dam, Nico
Abstract:
Partially Premixed Combustion (PPC) is a promising combustion concept ,based on judicious tuning of the charge stratification, to meet the increasing demands of emission legislation and to improve fuel efficiency. Longer ignition delays of PPC in comparison with conventional diesel combustion provide better fuel/air mixture which decreases soot and NO emissions. Moreover, a proper injection timing and strategy for PPC can improve the combustion stability as a result of a higher level of fuel stratification in comparison with the Homogeneous Charge Compression Ignition (HCCI) concept. Injection timing is the major parameter with which to affect the level of fuel and combustion stratification and to control the combustion phasing and the heat release behavior. The scope of the present study is to investigate the fluid flow characteristics of PPC at different injection timings. To this end, high-speed Particle Image Velocimetry (PIV) is implemented in a light-duty optical engine to measure fluid flow characteristics, including the flow fields, mean velocity and cycle-resolved turbulence, inside the piston bowl as well as the squish region with a temporal resolution of 1 crank angle degree at 800 rpm. Two injectors, having 5 and 7 holes, were compared to see their effects on fluid flow and heat release behavior for different injection timings. Reactive and non-reactive measurements were performed to distinguish injection-driven and combustion-driven turbulence. Formation of vortices and higher turbulence levels enhance the air/fuel interaction, changing the level of fuel stratification and combustion duration. Results demonstrate clearly how turbulence level correlates with heat release behavior, and provide a quantitative dataset for validation of numerical simulations.
KAUST Department:
King Abdullah University of Science and Technology, , Saudi Arabia
Citation:
Izadi Najafabadi M, Tanov S, Wang H, Somers B, Johansson B, et al. (2017) Effects of Injection Timing on Fluid Flow Characteristics of Partially Premixed Combustion Based on High-Speed Particle Image Velocimetry. SAE International Journal of Engines 10. Available: http://dx.doi.org/10.4271/2017-01-0744.
Publisher:
SAE International
Journal:
SAE International Journal of Engines
Issue Date:
28-Mar-2017
DOI:
10.4271/2017-01-0744
Type:
Article
ISSN:
1946-3944
Sponsors:
The research leading to these results has received funding from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013/ under REA grant agreement n° 607214. The authors would like to acknowledge Dantec Dynamics for providing the PIV setup and post-processing support.
Additional Links:
https://saemobilus.sae.org/content/2017-01-0744
Appears in Collections:
Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorIzadi Najafabadi, Mohammaden
dc.contributor.authorTanov, Slaveyen
dc.contributor.authorWang, Huaen
dc.contributor.authorSomers, Barten
dc.contributor.authorJohansson, Bengten
dc.contributor.authorDam, Nicoen
dc.date.accessioned2017-05-22T06:58:03Z-
dc.date.available2017-05-22T06:58:03Z-
dc.date.issued2017-03-28en
dc.identifier.citationIzadi Najafabadi M, Tanov S, Wang H, Somers B, Johansson B, et al. (2017) Effects of Injection Timing on Fluid Flow Characteristics of Partially Premixed Combustion Based on High-Speed Particle Image Velocimetry. SAE International Journal of Engines 10. Available: http://dx.doi.org/10.4271/2017-01-0744.en
dc.identifier.issn1946-3944en
dc.identifier.doi10.4271/2017-01-0744en
dc.identifier.urihttp://hdl.handle.net/10754/623677-
dc.description.abstractPartially Premixed Combustion (PPC) is a promising combustion concept ,based on judicious tuning of the charge stratification, to meet the increasing demands of emission legislation and to improve fuel efficiency. Longer ignition delays of PPC in comparison with conventional diesel combustion provide better fuel/air mixture which decreases soot and NO emissions. Moreover, a proper injection timing and strategy for PPC can improve the combustion stability as a result of a higher level of fuel stratification in comparison with the Homogeneous Charge Compression Ignition (HCCI) concept. Injection timing is the major parameter with which to affect the level of fuel and combustion stratification and to control the combustion phasing and the heat release behavior. The scope of the present study is to investigate the fluid flow characteristics of PPC at different injection timings. To this end, high-speed Particle Image Velocimetry (PIV) is implemented in a light-duty optical engine to measure fluid flow characteristics, including the flow fields, mean velocity and cycle-resolved turbulence, inside the piston bowl as well as the squish region with a temporal resolution of 1 crank angle degree at 800 rpm. Two injectors, having 5 and 7 holes, were compared to see their effects on fluid flow and heat release behavior for different injection timings. Reactive and non-reactive measurements were performed to distinguish injection-driven and combustion-driven turbulence. Formation of vortices and higher turbulence levels enhance the air/fuel interaction, changing the level of fuel stratification and combustion duration. Results demonstrate clearly how turbulence level correlates with heat release behavior, and provide a quantitative dataset for validation of numerical simulations.en
dc.description.sponsorshipThe research leading to these results has received funding from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007-2013/ under REA grant agreement n° 607214. The authors would like to acknowledge Dantec Dynamics for providing the PIV setup and post-processing support.en
dc.publisherSAE Internationalen
dc.relation.urlhttps://saemobilus.sae.org/content/2017-01-0744en
dc.rightsArchived with thanks to SAE International Journal of Enginesen
dc.titleEffects of Injection Timing on Fluid Flow Characteristics of Partially Premixed Combustion Based on High-Speed Particle Image Velocimetryen
dc.typeArticleen
dc.contributor.departmentKing Abdullah University of Science and Technology, , Saudi Arabiaen
dc.identifier.journalSAE International Journal of Enginesen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionEindhoven University Of Technology, , Netherlandsen
dc.contributor.institutionLund University, , Swedenen
dc.contributor.institutionDantec Dynamics A/S, , Denmarken
kaust.authorJohansson, Bengten
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