The nature of "superknock" and its origins in SI engines

G. T. Kalghatgi, D. Bradley, J. Andrae, A. J. Harrison

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Extremely high knock intensities are observed occasionally in turbo charged spark ignition (SI) engines. Such events have been informally described as "Super knock" and are often associated with pre-ignition. Knock is initiated by auto ignition at one or more "hot spots". The mode of propagation of the resulting pressure wave depends on the propagation velocity of the auto ignitive front. When this becomes coupled with the acoustic wave, a localised detonation begins to develop, resulting in a very high rate of pressure rise. It is shown, through semi quantitative analysis including chemical kinetic calculations, that developing detonation becomes more likely when end-gas pressures and temperatures increase and might be the reason for "Super knock".

Original languageEnglish
Title of host publicationInstitution of Mechanical Engineers - Internal Combustion Engines
Subtitle of host publicationPerformance, Fuel Economy and Emissions
Pages259-269
Number of pages11
Publication statusPublished - 2009
Externally publishedYes
EventIMechE's Internal Combustion Engines: Performance, Fuel Economy and Emissions Conference - London, United Kingdom
Duration: 8 Dec 20099 Dec 2009

Publication series

NameInstitution of Mechanical Engineers - Internal Combustion Engines: Performance, Fuel Economy and Emissions

Conference

ConferenceIMechE's Internal Combustion Engines: Performance, Fuel Economy and Emissions Conference
Country/TerritoryUnited Kingdom
CityLondon
Period8/12/099/12/09

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