Characterization of knocking combustion and heat transfer in a spark ignition engine

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Syrimis, Michalis

• Engineering, Automotive
• Engineering, Mechanical

Statement dc:rights

• Copyright 1996 Syrimis, Michalis

Language dc:language

eng

Identifier

9780591200089
AAI9712451
(UMI)AAI9712451

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/20406