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Laser ignition of iso-octane air aerosols

Lawes, M., Lee, Y., Mokhtar, A.S. and Woolley, R. (2008) Laser ignition of iso-octane air aerosols. Combustion Science and Technology, 180 (2). pp. 296-313. ISSN 00102202

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Abstract

Iso-octane aerosols in air have been ignited with a focused Nd:YAG laser at pressures and temperatures of 100kPa and 270K and imaged using schlieren photography. The aerosol was generated using the Wilson cloud chamber technique. The droplet diameter, gas phase equivalence ratio and droplet number density were determined. The input laser energy and overall equivalence ratio were varied. For 270mJ pulse energies initial breakdown occurred at a number of sites along the laser beam axis. From measurements of the shock wave velocity it was found that energy was not deposited into the sites evenly. At pulse energies of 32mJ a single ignition site was observed. Overall fuel lean flames were observed to locally extinguish, however both stoichiometric and fuel rich flames were ignited. The minimum ignition energy was found to depend on the likelihood of a droplet existing at the focus of the laser beam.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright (c) 2008 Elsevier Science B.V., Amsterdam. This is an author produced version of a paper published in ' Combustion Science and Technology '. Uploaded in accordance with the publisher's self-archiving policy.
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Mechanical Engineering (Leeds)
The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)
Depositing User: Mr Christopher Hardwick
Date Deposited: 20 Aug 2009 14:21
Last Modified: 08 Feb 2013 17:06
Published Version: http://dx.doi.org/10.1080/00102200701739198
Status: Published
Publisher: Elsevier Science B.V.
Identification Number: 10.1080/00102200701739198
URI: http://eprints.whiterose.ac.uk/id/eprint/9193

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