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High-Speed PLIF Imaging for Investigation of Turbulence Effects on Heat Release Rates in HCCI Combustion
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2007 (English)In: Session: Homogeneous Charge Compression Ignition (HCCI) (Part 4 of 8) Combustion Modeling / Optical Diagnostics, 2007Conference paper (Refereed)
Abstract [en]

High-speed laser diagnostics was utilized for single-cycle resolved studies of the fuel distribution in the combustion chamber of a truck-size HCCI engine. A multi-YAG laser system consisting of four individual Nd:YAG lasers was used for planar laser-induced fluorescence (PLIF) imaging of the fuel distribution. The fundamental beam from the lasers at 1064 nm was frequency quadrupled in order to obtain laser pulses at 266 nm suitable for excitation of acetone that was used as fuel tracer. Bursts of up to eight pulses with very short time separation were produced, allowing PLIF images with high temporal resolution to be captured within one single cycle event. The system was used together with a high-speed framing camera employing eight ICCD modules, with a frame-rate matching the laser pulse repetition rate. The combustion evolution was studied in terms of spatial distribution and rate of fuel consumption for different engine hardware configurations as well as operating conditions e.g. different stoichiometries and combustion phasing. Two different piston crown geometry were used for altering the degree of turbulence in the combustion chamber. In addition to the optical investigations, the impact of turbulence effects was also studied by calculating the rate of heat-release and combustion phasing from the pressure trace.

Place, publisher, year, edition, pages
, SAE Technical Papers, 2007-01-0213
Keyword [en]
1064 nm, Combustion phasing, Frame-rate, Framing Camera, Fuel distribution, Hardware configurations, HCCI combustion, HCCI engine, Heat release, Heat Release Rate (HRR), High temporal resolution, High-speed, Laser systems, ND : YAG lasers, Operating condition, Optical investigation, Planar laser induced fluorescence, PLIF images, Single cycle, Time separation, Turbulence effect
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-177546DOI: 10.4271/2007-01-0213ScopusID: 2-s2.0-84877213542OAI: diva2:873208
SAE World Congress & Exhibition, Detroit, MI, USA.

QC 20151127

Available from: 2015-11-23 Created: 2015-11-23 Last updated: 2015-11-27Bibliographically approved

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Hultqvist, Anders
Mechanical Engineering

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