TY - GEN
T1 - The nature of "superknock" and its origins in SI engines
AU - Kalghatgi, G. T.
AU - Bradley, D.
AU - Andrae, J.
AU - Harrison, A. J.
PY - 2009
Y1 - 2009
N2 - 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".
AB - 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".
UR - http://www.scopus.com/inward/record.url?scp=77952390994&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:77952390994
SN - 9781843346074
T3 - Institution of Mechanical Engineers - Internal Combustion Engines: Performance, Fuel Economy and Emissions
SP - 259
EP - 269
BT - Institution of Mechanical Engineers - Internal Combustion Engines
T2 - IMechE's Internal Combustion Engines: Performance, Fuel Economy and Emissions Conference
Y2 - 8 December 2009 through 9 December 2009
ER -