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Three-dimensional laser induced fluorescence of fuel distributions in an HCCI engine

In English

Författare

Summary, in English

Three-dimensional imaging of fuel tracer planar laser-induced fluorescence in a homogeneous charge compression ignition (HCCI) engine is presented. A high-speed multiple Nd:YAG laser and detection system, in combination, with a scanning mirror, are used to collect eight images, with an equidistant separation of 0.5 mm. Three-dimensional isoconcentration surfaces calculated from the data are visualized. Three-dimensional imaging offers new opportunities to study different combustion events, specifically the topology of flame structures. For example, it is possible to distinguish if separate islands in a fluorescence image really are separate or if it is an effect from wrinkling in and out of the laser sheet. The PLIF images were also analyzed by identifying five intensity ranges corresponding to increasing degrees of reaction progress. The gradual fuel consumption and thus combustion was then analyzed by calculating the volumetric fraction of these intensity ranges for different crank angle positions. The occurrence of multiple isolated ignition spots and the observed gradual decrease in fuel concentration indicates that HCCI combustion relies on distributed reactions and not flame propagation.

Publiceringsår

2002

Språk

Engelska

Sidor

679-685

Publikation/Tidskrift/Serie

Proceedings of the Combustion Institute

Volym

29

Dokumenttyp

Konferensbidrag

Förlag

Elsevier

Ämne

  • Atom and Molecular Physics and Optics
  • Other Mechanical Engineering

Conference name

Twenty-Ninth International Symposium on Combustion Hokkaido University Sapporo Japan

Conference date

2002-07-21 - 2002-07-25

Conference place

Sapporo, Japan

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0082-0784