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High-Speed Lif Imaging for Cycle-Resolved Formaldehyde Visualization in Hcci Combustion
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2005 (English)In: SAE, Session: Combustion and Flow Diagnostics, 2005Conference paper (Refereed)
Abstract [en]

High-speed laser diagnostics was utilized for single-cycle resolved studies of the formaldehyde distribution in the combustion chamber of an HCCI engine. A multi-YAG laser system consisting of four individual Q-switched, flash lamp-pumped Nd:YAG lasers has previously been developed in order to obtain laser pulses at 355 nm suitable for performing LIF measurements of the formaldehyde molecule. Bursts of up to eight pulses with very short time separation can be produced, allowing capturing of LIF image series with high temporal resolution. The system was used together with a high-speed framing camera employing eight intensified CCD modules, with a frame-rate matching the laser pulse repetition rate. The diagnostic system was used to study the combustion in a truck-size HCCI engine, running at 1200 rpm using n-heptane as fuel. By using laser pulses with time separations as short as 70 μs, cycle-resolved image sequences of the formaldehyde distribution were obtained. Thus, with this technique it is possible to follow the formaldehyde formation and consumption processes within a single cycle. The combustion evolution was studied in terms of the rate and spatial structure of formaldehyde formation and consumption for different engine operating conditions, e.g. different stoichiometries. Also, the impact on the rate of heat-release was investigated.

Place, publisher, year, edition, pages
, SAE Technical Papers, 2005-01-0641
Keyword [en]
Cycle-resolved, Diagnostic systems, Engine operating conditions, Frame-rate, Framing Camera, HCCI combustion, HCCI engine, Heat release, High temporal resolution, High-speed, Image sequence, Image series, Intensified CCD, Laser systems, LIF imaging, n-Heptanes, ND : YAG lasers, Q-switched, Single cycle, Spatial structure, Time separation
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-177562DOI: 10.4271/2005-01-0641ScopusID: 2-s2.0-84877496003OAI: diva2:873254
SAE 2005 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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