Blending Octane Number of Ethanol on a Volume and Molar Basis in SI and HCCI Combustion Modes

Handle URI:
http://hdl.handle.net/10754/626300
Title:
Blending Octane Number of Ethanol on a Volume and Molar Basis in SI and HCCI Combustion Modes
Authors:
Waqas, Muhammad Umer; Morganti, Kai; Masurier, Jean-Baptiste; Johansson, Bengt
Abstract:
The blending behavior of ethanol in five different hydrocarbon base fuels with octane numbers of approximately 70 and 84 was examined under Spark-Ignited (SI) and Homogeneous Charge Compression Ignited (HCCI) operating conditions. The Blending octane number (BON) was used to characterize the blending behavior on both a volume and molar basis. Previous studies have shown that the blending behavior of ethanol generally follows several well-established rules. In particular, non-linear blending effects are generally observed on a volume basis (i.e. BON > RON or MON of pure ethanol; 108 and 89, respectively), while linear blending effects are generally observed on a molar basis (i.e. BON = RON or MON of pure ethanol). This work firstly demonstrates that the non-linear volumetric blending effects traditionally observed under SI operating conditions are also observed under HCCI operating conditions. In keeping with previous studies, the degree of this non-linearity is shown to be a function of the base fuel composition and octane number. By contrast, the molar blending approach is shown to behave differently depending on the chosen combustion mode, with some non-linearity observed under HCCI operating conditions (i.e. BON RON or MON of pure ethanol). This suggests that the well-established blending rules for SI operating conditions may not always be relevant to other combustion modes that operate with globally lean or diluted air-fuel mixtures. This has implications for the design of future fuel specifications.
KAUST Department:
Clean Combustion Research Center
Citation:
Waqas MU, Morganti K, Masurier J-B, Johansson B (2017) Blending Octane Number of Ethanol on a Volume and Molar Basis in SI and HCCI Combustion Modes. SAE Technical Paper Series. Available: http://dx.doi.org/10.4271/2017-01-2256.
Publisher:
SAE International
Journal:
SAE Technical Paper Series
Conference/Event name:
International Powertrains, Fuels & Lubricants Meeting
Issue Date:
8-Oct-2017
DOI:
10.4271/2017-01-2256
Type:
Conference Paper
Sponsors:
The authors would like to thank the Clean Combustion Research Center for providing the experimental facilities. This work was supported by competitive research funding from King Abdullah University of Science and Technology (KAUST). The authors also wishe to thank Mohammed Almansour and Ahmad Radhwan (Saudi Aramco) for preparing the test fuels.
Additional Links:
https://saemobilus.sae.org/content/2017-01-2256; http://papers.sae.org/2017-01-2256/
Appears in Collections:
Conference Papers

Full metadata record

DC FieldValue Language
dc.contributor.authorWaqas, Muhammad Umeren
dc.contributor.authorMorganti, Kaien
dc.contributor.authorMasurier, Jean-Baptisteen
dc.contributor.authorJohansson, Bengten
dc.date.accessioned2017-12-06T13:39:51Z-
dc.date.available2017-12-06T13:39:51Z-
dc.date.issued2017-10-08-
dc.identifier.citationWaqas MU, Morganti K, Masurier J-B, Johansson B (2017) Blending Octane Number of Ethanol on a Volume and Molar Basis in SI and HCCI Combustion Modes. SAE Technical Paper Series. Available: http://dx.doi.org/10.4271/2017-01-2256.en
dc.identifier.doi10.4271/2017-01-2256-
dc.identifier.urihttp://hdl.handle.net/10754/626300-
dc.description.abstractThe blending behavior of ethanol in five different hydrocarbon base fuels with octane numbers of approximately 70 and 84 was examined under Spark-Ignited (SI) and Homogeneous Charge Compression Ignited (HCCI) operating conditions. The Blending octane number (BON) was used to characterize the blending behavior on both a volume and molar basis. Previous studies have shown that the blending behavior of ethanol generally follows several well-established rules. In particular, non-linear blending effects are generally observed on a volume basis (i.e. BON > RON or MON of pure ethanol; 108 and 89, respectively), while linear blending effects are generally observed on a molar basis (i.e. BON = RON or MON of pure ethanol). This work firstly demonstrates that the non-linear volumetric blending effects traditionally observed under SI operating conditions are also observed under HCCI operating conditions. In keeping with previous studies, the degree of this non-linearity is shown to be a function of the base fuel composition and octane number. By contrast, the molar blending approach is shown to behave differently depending on the chosen combustion mode, with some non-linearity observed under HCCI operating conditions (i.e. BON RON or MON of pure ethanol). This suggests that the well-established blending rules for SI operating conditions may not always be relevant to other combustion modes that operate with globally lean or diluted air-fuel mixtures. This has implications for the design of future fuel specifications.en
dc.description.sponsorshipThe authors would like to thank the Clean Combustion Research Center for providing the experimental facilities. This work was supported by competitive research funding from King Abdullah University of Science and Technology (KAUST). The authors also wishe to thank Mohammed Almansour and Ahmad Radhwan (Saudi Aramco) for preparing the test fuels.en
dc.publisherSAE Internationalen
dc.relation.urlhttps://saemobilus.sae.org/content/2017-01-2256en
dc.relation.urlhttp://papers.sae.org/2017-01-2256/en
dc.rightsArchived with thanks to SAE Technical Paper Seriesen
dc.subjectBlending octane number of ethanolen
dc.subjectHCCI combustionen
dc.subjectVolume and molar basisen
dc.titleBlending Octane Number of Ethanol on a Volume and Molar Basis in SI and HCCI Combustion Modesen
dc.typeConference Paperen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalSAE Technical Paper Seriesen
dc.conference.date2017-10-15 to 2017-10-19en
dc.conference.nameInternational Powertrains, Fuels & Lubricants Meetingen
dc.conference.locationBeijing, Chinaen
dc.eprint.versionPost-printen
dc.contributor.institutionSaudi Aramcoen
kaust.authorWaqas, Muhammad Umeren
kaust.authorMasurier, Jean-Baptisteen
kaust.authorJohansson, Bengten
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