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Optical Diagnostics of Laser-Induced and Spark Plug-Assisted HCCI Combustion
- Source :
- SAE Transactions, Journal of Engines; 114(3), pp 284-295 (2005)
- Publication Year :
- 2005
- Publisher :
- SAE International, 2005.
-
Abstract
- HCCI (Homogeneous Charge Compression Ignition), laser-assisted HCCI and spark plug-assisted HCCI combustion was studied experimentally in a modified single cylinder truck-size Scania D12 engine equipped with a quartz liner and quartz piston crown for optical access. The aim of this study was to find out how and to what extent the spark, generated to influence or even trigger the onset of ignition, influences the auto-ignition process or whether primarily normal compressioninduced ignition remains prevailing. The beam of a Qswitched Nd:YAG laser (5 ns pulse duration, 25 mJ pulse energy) was focused into the centre of the cylinder to generate a plasma. For comparison, a conventional spark plug located centrally in the cylinder head was alternatively used to obtain sparks at a comparable location. No clear difference in the heat releases during combustion between the three different cases of ignition start could be seen for the fuel of 80/20 iso-octane/nheptane used. However, with optical diagnostic methods, namely PLIF (Planar Laser-Induced Fluorescence), Schlieren photography and chemiluminescence imaging, differences in the combustion process could be evaluated.
- Subjects :
- Optical Diagnostics
business.industry
Chemistry
Atom and Molecular Physics and Optics
Homogeneous charge compression ignition
Spark Ignition
Laser ignition
Combustion
Mechanical engineering
Laser Ignition
law.invention
Ignition system
Optics
Internal combustion engine
Cylinder head
law
HCCI
Other Mechanical Engineering
Ignition timing
Engine knocking
business
Spark plug
Engine
Subjects
Details
- ISSN :
- 01487191 and 0096736X
- Database :
- OpenAIRE
- Journal :
- SAE Technical Paper Series
- Accession number :
- edsair.doi.dedup.....918c2235c584ca717d4df942aeae3904