The effects of fuel evaporation on engine knock

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dc.contributor.advisorYates, Andrewen_ZA
dc.contributor.authorMoran, Derek Paulen_ZA
dc.date.accessioned2014-10-17T07:30:58Z
dc.date.available2014-10-17T07:30:58Z
dc.date.issued1993en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractIt has been known for a long time that alcohol-gasoline blended fuels exhibit an unexplained tendency to knock at high engine speeds; a characteristic that is not generally experienced with conventional gasoline. Early studies showed that the problem could be linked to an unusually high temperature sensitivity exhibited by the blended fuels, but the exact cause of this temperature sensitivity was not readily identified, and research efforts became diversified in attempts to make headway. Initial studies in the field of high-speed knock were based on the assumption that a chemical reaction sensitivity to temperature was the root cause. It is now suspected that the effect may be due to a thermal manifestation of the variation in evaporative cooling characteristics of different fuels at different engine speeds. Research findings leading up to the present project have indicated that the high-speed knock phenomenon could be explained by the influence on the overall mixture temperature of the thermal-evaporative behaviour of a fuel during the inlet process. The thermal-evaporative behaviour is very complex, however, and has been characterized only tentatively, as yet. The present project was initiated to study the effect of engine speed on the fuel evaporation behaviour and on the complex heat transfer processes that occur within the intake manifold of a spark-ignition engine. The primary aim of the project was to establish the temperature of the air/fuel mixture after the inlet process has been completed, and to identify how this temperature responds to changes in engine speed and fuel composition. The fuels investigated included conventional gasoline and gasoline-alcohol blends. It was anticipated that the findings of the project would enable the fundamental hypothesis concerning the basic cause of high-speed knock to be evaluated.en_ZA
dc.identifier.apacitationMoran, D. P. (1993). <i>The effects of fuel evaporation on engine knock</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/8478en_ZA
dc.identifier.chicagocitationMoran, Derek Paul. <i>"The effects of fuel evaporation on engine knock."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1993. http://hdl.handle.net/11427/8478en_ZA
dc.identifier.citationMoran, D. 1993. The effects of fuel evaporation on engine knock. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Moran, Derek Paul AB - It has been known for a long time that alcohol-gasoline blended fuels exhibit an unexplained tendency to knock at high engine speeds; a characteristic that is not generally experienced with conventional gasoline. Early studies showed that the problem could be linked to an unusually high temperature sensitivity exhibited by the blended fuels, but the exact cause of this temperature sensitivity was not readily identified, and research efforts became diversified in attempts to make headway. Initial studies in the field of high-speed knock were based on the assumption that a chemical reaction sensitivity to temperature was the root cause. It is now suspected that the effect may be due to a thermal manifestation of the variation in evaporative cooling characteristics of different fuels at different engine speeds. Research findings leading up to the present project have indicated that the high-speed knock phenomenon could be explained by the influence on the overall mixture temperature of the thermal-evaporative behaviour of a fuel during the inlet process. The thermal-evaporative behaviour is very complex, however, and has been characterized only tentatively, as yet. The present project was initiated to study the effect of engine speed on the fuel evaporation behaviour and on the complex heat transfer processes that occur within the intake manifold of a spark-ignition engine. The primary aim of the project was to establish the temperature of the air/fuel mixture after the inlet process has been completed, and to identify how this temperature responds to changes in engine speed and fuel composition. The fuels investigated included conventional gasoline and gasoline-alcohol blends. It was anticipated that the findings of the project would enable the fundamental hypothesis concerning the basic cause of high-speed knock to be evaluated. DA - 1993 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1993 T1 - The effects of fuel evaporation on engine knock TI - The effects of fuel evaporation on engine knock UR - http://hdl.handle.net/11427/8478 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/8478
dc.identifier.vancouvercitationMoran DP. The effects of fuel evaporation on engine knock. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1993 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/8478en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mechanical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMechanical Engineeringen_ZA
dc.titleThe effects of fuel evaporation on engine knocken_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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