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Knock damage in spark-ignition engines
The objectives of this thesis were to identify, explain and quantify the damage caused by knocking combustion in spark-ignition engines. A literature review indicated that, in general, research into knock has focused on the causes and avoidance of knock, rather than on the damage resulting from knoc...
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| Format: | Thesis |
| Language: | English |
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Department of Mechanical Engineering
2015
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| _version_ | 1867613332032192512 |
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| access_status_str | Open Access |
| author | Nates, Roy Jonathan |
| author2 | Yates, Andrew |
| author_browse | Nates, Roy Jonathan Yates, Andrew |
| author_facet | Yates, Andrew Nates, Roy Jonathan |
| author_sort | Nates, Roy Jonathan |
| collection | Thesis |
| description | The objectives of this thesis were to identify, explain and quantify the damage caused by knocking combustion in spark-ignition engines. A literature review indicated that, in general, research into knock has focused on the causes and avoidance of knock, rather than on the damage resulting from knock. The few published works concerning the effects of knock were mainly interested in the prevention of one specific form of damage, namely piston erosion. The review highlighted the need to investigate the relationship between knock and the various forms of damage. Using the evidence from knock-damaged engines, the sequence of events leading to failure were reconstructed. The manner in which knock damage manifests itself as surface erosion, piston-ring failure, piston-land cracking, piston blow-by and seizure were examined. From these observations it was deduced that two independent damage paths result from knock. Consequently, the research diverged into two studies, namely: Local pressure-temperature transients in the end-gas zone which cause localised erosion damage; Excessive heat flux associated with knocking combustion which results in global piston and ring problems. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/11478 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:27.383Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| 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:11427/11478 Knock damage in spark-ignition engines Nates, Roy Jonathan Yates, Andrew Mechanical Engineering The objectives of this thesis were to identify, explain and quantify the damage caused by knocking combustion in spark-ignition engines. A literature review indicated that, in general, research into knock has focused on the causes and avoidance of knock, rather than on the damage resulting from knock. The few published works concerning the effects of knock were mainly interested in the prevention of one specific form of damage, namely piston erosion. The review highlighted the need to investigate the relationship between knock and the various forms of damage. Using the evidence from knock-damaged engines, the sequence of events leading to failure were reconstructed. The manner in which knock damage manifests itself as surface erosion, piston-ring failure, piston-land cracking, piston blow-by and seizure were examined. From these observations it was deduced that two independent damage paths result from knock. Consequently, the research diverged into two studies, namely: Local pressure-temperature transients in the end-gas zone which cause localised erosion damage; Excessive heat flux associated with knocking combustion which results in global piston and ring problems. 2015-01-05T18:48:31Z 2015-01-05T18:48:31Z 1995 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/11478 eng application/pdf Department of Mechanical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Mechanical Engineering Nates, Roy Jonathan Knock damage in spark-ignition engines |
| thesis_degree_str | Doctoral |
| title | Knock damage in spark-ignition engines |
| title_full | Knock damage in spark-ignition engines |
| title_fullStr | Knock damage in spark-ignition engines |
| title_full_unstemmed | Knock damage in spark-ignition engines |
| title_short | Knock damage in spark-ignition engines |
| title_sort | knock damage in spark ignition engines |
| topic | Mechanical Engineering |
| url | http://hdl.handle.net/11427/11478 |
| work_keys_str_mv | AT natesroyjonathan knockdamageinsparkignitionengines |