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Optical Diagnostics of Laser-Induced and Spark Plug-Assisted Hcci
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2005 (English)In: SAE, Session: Homogeneous Charge Compression Ignition (HCCI) Combustion (Part 6 & 7), 2005Conference paper (Refereed)
Abstract [en]

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 compression-induced ignition remains prevailing. The beam of a Q-switched 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/n-heptane 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.

Place, publisher, year, edition, pages
, SAE Technical Papers, 2005-01-0129
Keyword [en]
Auto-ignition process, Chemiluminescence imaging, Combustion pro-cess, D12 engine, HCCI combustion, Heat release, Homogeneous charge compression ignition, iso-Octane, Laser induced, Laser-assisted, Optical access, Optical diagnostic methods, Optical diagnostics, Planar laser induced fluorescence, Pulse durations, Pulse energies, Q switched Nd:YAG laser, Schlieren photography
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-177559DOI: 10.4271/2005-01-0129ScopusID: 2-s2.0-84877516457OAI: diva2:873250
SAE 2005 World Congress & Exhibition, April 2005, Detroit, MI, USA.

QC 20151125

Available from: 2015-11-23 Created: 2015-11-23 Last updated: 2015-11-25Bibliographically approved

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Hultqvist, Anders
Mechanical Engineering

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