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The effects of fuel evaporation on engine knock
Includes bibliographical references.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Mechanical Engineering
2014
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| _version_ | 1867613205184905217 |
|---|---|
| access_status_str | Open Access |
| author | Moran, Derek Paul |
| author2 | Yates, Andrew |
| author_browse | Moran, Derek Paul Yates, Andrew |
| author_facet | Yates, Andrew Moran, Derek Paul |
| author_sort | Moran, Derek Paul |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/8478 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:26.116Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Department of Mechanical Engineering |
| publisherStr | Department of Mechanical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/8478 The effects of fuel evaporation on engine knock Moran, Derek Paul Yates, Andrew Mechanical Engineering Includes bibliographical references. 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. 2014-10-17T07:30:58Z 2014-10-17T07:30:58Z 1993 Master Thesis Masters MSc http://hdl.handle.net/11427/8478 eng application/pdf Department of Mechanical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Mechanical Engineering Moran, Derek Paul The effects of fuel evaporation on engine knock |
| thesis_degree_str | Master's |
| title | The effects of fuel evaporation on engine knock |
| title_full | The effects of fuel evaporation on engine knock |
| title_fullStr | The effects of fuel evaporation on engine knock |
| title_full_unstemmed | The effects of fuel evaporation on engine knock |
| title_short | The effects of fuel evaporation on engine knock |
| title_sort | effects of fuel evaporation on engine knock |
| topic | Mechanical Engineering |
| url | http://hdl.handle.net/11427/8478 |
| work_keys_str_mv | AT moranderekpaul theeffectsoffuelevaporationonengineknock AT moranderekpaul effectsoffuelevaporationonengineknock |