{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/20406"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/20406","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Characterization of knocking combustion and heat transfer in a spark ignition engine","abstract":"An experimental study was conducted to investigate combustion and in-cylinder heat transfer characteristics under light and heavy knocking conditions in a spark ignition engine. A special, single cylinder, Mitsubishi R52 engine was used, in its extended piston configuration. Fast response heat flux probes on the piston and the cylinder head provided instantaneous surface temperature measurements at different locations, both inside and outside the end-gas region. The knocking combustion process was characterized by several knock indices, based on the net heat release analysis of cylinder pressure, as well as, the amplitude of the knock induced pressure fluctuations. Knock initiation and development were investigated by sampling cylinder pressure data at two different locations in the chamber. The cyclic variability associated with knocking combustion was investigated by studying the variation, as well as the interdependence of the knock indices, under different knock severity conditions. Finally, the effects of knock on heat transfer were explored by studying changes in ensemble-average heat flux with increasing knock intensity, and also by the magnitude of the correlation coefficients between peak heat flux and the developed knock indices.","abstract_html":"An experimental study was conducted to investigate combustion and in-cylinder heat transfer characteristics under light and heavy knocking conditions in a spark ignition engine. A special, single cylinder, Mitsubishi R52 engine was used, in its extended piston configuration. Fast response heat flux probes on the piston and the cylinder head provided instantaneous surface temperature measurements at different locations, both inside and outside the end-gas region. The knocking combustion process was characterized by several knock indices, based on the net heat release analysis of cylinder pressure, as well as, the amplitude of the knock induced pressure fluctuations. Knock initiation and development were investigated by sampling cylinder pressure data at two different locations in the chamber. The cyclic variability associated with knocking combustion was investigated by studying the variation, as well as the interdependence of the knock indices, under different knock severity conditions. Finally, the effects of knock on heat transfer were explored by studying changes in ensemble-average heat flux with increasing knock intensity, and also by the magnitude of the correlation coefficients between peak heat flux and the developed knock indices.","abstract_has_math":false,"creators":["Syrimis, Michalis"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:38:17Z","date_published":"2011-05-07T12:38:17Z","updated_at":"2026-07-22T22:25:15Z","subjects":["Engineering, Automotive","Engineering, Mechanical"],"languages":["eng"],"rights":["Copyright 1996 Syrimis, Michalis"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591200089","AAI9712451","(UMI)AAI9712451"],"render_values":[{"text":"9780591200089","href":null,"code":true},{"text":"AAI9712451","href":null,"code":true},{"text":"(UMI)AAI9712451","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/20406","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Syrimis, Michalis"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:38:17Z","10000-01-01","1996"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Automotive","Engineering, Mechanical"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1996 Syrimis, Michalis"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["9780591200089","AAI9712451","(UMI)AAI9712451","http://hdl.handle.net/2142/20406"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["An experimental study was conducted to investigate combustion and in-cylinder heat transfer characteristics under light and heavy knocking conditions in a spark ignition engine. A special, single cylinder, Mitsubishi R52 engine was used, in its extended piston configuration. Fast response heat flux probes on the piston and the cylinder head provided instantaneous surface temperature measurements at different locations, both inside and outside the end-gas region. The knocking combustion process was characterized by several knock indices, based on the net heat release analysis of cylinder pressure, as well as, the amplitude of the knock induced pressure fluctuations. Knock initiation and development were investigated by sampling cylinder pressure data at two different locations in the chamber. The cyclic variability associated with knocking combustion was investigated by studying the variation, as well as the interdependence of the knock indices, under different knock severity conditions. Finally, the effects of knock on heat transfer were explored by studying changes in ensemble-average heat flux with increasing knock intensity, and also by the magnitude of the correlation coefficients between peak heat flux and the developed knock indices.","Evidence of multiple autoignition sites was found during the knock initiation process. Knock induced pressure waves were of acoustic nature, becoming weak shock waves in cases of violent autoignitions. Cyclic variability in knock intensity was found to be driven by variations in burn rate. The correlation between burn rate and knock intensity was higher for lower overall combustion rates. Under light knock, the ensemble-average peak heat flux at locations near the end-gas zone increased with spark advance, departing from its trend prior to the onset of knock. Under heavy knock, the ensemble-average peak heat flux increased over the entire piston crown. High statistical correlation (up to 0.80) was found between peak heat flux and certain of the autoignition indices within and near the end-gas zone. Knock was found to increase heat transfer by the 'scouring' action of the induced pressure waves on the wall thermal boundary layer. Apart from knock intensity, the location of autoignition initiation, and the characteristics of the flame and wave front patterns following autoignition were found to affect the magnitude of heat transfer changes.","Made available in DSpace on 2011-05-07T12:38:17Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712451.pdf: 8335056 bytes, checksum: a547f9e2d0fcb63e267d8d57436870e8 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:43:41Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:19:08-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Characterization of knocking combustion and heat transfer in a spark ignition engine"]}]}],"canonical_facts":{"dc:creator":["Syrimis, Michalis"],"dc:date":["2011-05-07T12:38:17Z","10000-01-01","1996"],"dc:description":["An experimental study was conducted to investigate combustion and in-cylinder heat transfer characteristics under light and heavy knocking conditions in a spark ignition engine. A special, single cylinder, Mitsubishi R52 engine was used, in its extended piston configuration. Fast response heat flux probes on the piston and the cylinder head provided instantaneous surface temperature measurements at different locations, both inside and outside the end-gas region. The knocking combustion process was characterized by several knock indices, based on the net heat release analysis of cylinder pressure, as well as, the amplitude of the knock induced pressure fluctuations. Knock initiation and development were investigated by sampling cylinder pressure data at two different locations in the chamber. The cyclic variability associated with knocking combustion was investigated by studying the variation, as well as the interdependence of the knock indices, under different knock severity conditions. Finally, the effects of knock on heat transfer were explored by studying changes in ensemble-average heat flux with increasing knock intensity, and also by the magnitude of the correlation coefficients between peak heat flux and the developed knock indices.","Evidence of multiple autoignition sites was found during the knock initiation process. Knock induced pressure waves were of acoustic nature, becoming weak shock waves in cases of violent autoignitions. Cyclic variability in knock intensity was found to be driven by variations in burn rate. The correlation between burn rate and knock intensity was higher for lower overall combustion rates. Under light knock, the ensemble-average peak heat flux at locations near the end-gas zone increased with spark advance, departing from its trend prior to the onset of knock. Under heavy knock, the ensemble-average peak heat flux increased over the entire piston crown. High statistical correlation (up to 0.80) was found between peak heat flux and certain of the autoignition indices within and near the end-gas zone. Knock was found to increase heat transfer by the 'scouring' action of the induced pressure waves on the wall thermal boundary layer. Apart from knock intensity, the location of autoignition initiation, and the characteristics of the flame and wave front patterns following autoignition were found to affect the magnitude of heat transfer changes.","Made available in DSpace on 2011-05-07T12:38:17Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712451.pdf: 8335056 bytes, checksum: a547f9e2d0fcb63e267d8d57436870e8 (MD5) Previous issue date: 1996","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:43:41Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:19:08-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["9780591200089","AAI9712451","(UMI)AAI9712451","http://hdl.handle.net/2142/20406"],"dc:language":["eng"],"dc:rights":["Copyright 1996 Syrimis, Michalis"],"dc:subject":["Engineering, Automotive","Engineering, Mechanical"],"dc:title":["Characterization of knocking combustion and heat transfer in a spark ignition engine"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:15Z"}