• Time-resolved temperature images of laser-ignition using OH two-line laser-induced fluorescence (LIF) thermometry

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Today a new paper (Article Number 200508, November 2005) has been published in the IFRF Combustion Journal (http://www.journal.ifrf.net), entitled:

Time-resolved temperature images of laser-ignition using OH two-line laser-induced fluorescence (LIF) thermometry


Ying-Ling Chen
Center for Laser Applications,
The University of Tennessee Space Institute,
411 B. H. Goethert Parkway,
Tullahoma, Tennessee 37388-8897

phone: 931-393-7448,
fax: 931-454-2271,
email:  ychen@utsi.edu

This paper discusses the use of laser induce fluorescence of OH (OH-LIF) to explore the fast changing phenomena during laser induced ignition of a combustible mixture. The significance of this paper is not necessarily the description of the OH-LIF technique but the demonstration of the ability to capture the rapidly changing phenomena occurring during laser induced breakdown and the ensuing ignition. The authors show the development of the OH distribution in the breakdown and ignition region and use this distribution to calculate the temperature field as the breakdown and ignition progress. These kinds of measurements are very useful for the evaluation of computational fluid dynamic models of transient combustion phenomena.

Summary: The time-resolved spatial distribution of temperature for the transient laser-induced ignition of ammonia / oxygen mixtures is presented. Planar laser-induced fluorescence (PLIF) of OH was used to measure the temperature distribution by means of two selected transition lines observed using a steady flame to provide the collision quenching correction over the necessary range of temperatures. Information on the spatial and temporal evolution of gas temperature and species concentrations is essential for numerical modeling of laser spark ignition.

Key Words:
laser-induced breakdown, OH laser-induced fluorescence, time-resolved, planar laser-induced fluorescence, laser ignition

The full paper may be downloaded from the server, in the “New Papers” section (http://www.journal.ifrf.net/articles.html), by clicking on the Acrobat PDF icon alongside the title.

Publication in the Journal
The Editor-in-Chief (See associated article in this edition of the MNM) would like to remind all potential authors that publication in the Journal is open to all. If you have interesting results to publish in the field of, or related to, industrial combustion, we invite you to prepare a paper according to the guidelines given in the Author’s Guide on the website (http://www.journal.ifrf.net/).

Papers may be regular “articles” (typically up to 20 pages) or Communications (typically up to 4/5 pages). Review papers can of course be longer. Remember that figures and graphics in general can be in full color. This advantage should be encouraged.

All manuscripts and associated files, proposed for publication should be sent by the Corresponding Author in a compressed/zip file, as an email attachment to journal@ifrf.net. This file should include a statement that the proposal’s content is unpublished material that has not being submitted for publication elsewhere. When an article by the author(s) is cited in the proposed article as “in press”, a copy of this article should accompany the proposed article and should be included in the compressed file.
The Editor-in-Chief looks forward to receiving your proposals.