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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 19 — Sep. 20, 2004
  • pp: 4546–4557

Investigation of the early stages in laser-induced ignition by Schlieren photography and laser-induced fluorescence spectroscopy

M. Lackner, S. Charareh, F. Winter, K. F. Iskra, D. Rüdisser, T. Neger, H. Kopecek, and E. Wintner  »View Author Affiliations


Optics Express, Vol. 12, Issue 19, pp. 4546-4557 (2004)
http://dx.doi.org/10.1364/OPEX.12.004546


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Abstract

Laser ignition has been discussed widely as a potentially superior ignition source for technical appliances such as internal combustion engines. Ignition strongly affects overall combustion, and its early stages in particular have strong implications on subsequent pollutant formation, flame quenching, and extinction. Our research here is devoted to the experimental investigation of the early stages of laser-induced ignition of CH4/air mixtures up to high pressures. Tests were performed in a 0.9–l combustion cell with initial pressures of up to 25 bar with stoichiometric to fuel-lean mixtures using a 5-ns 50-mJ 1064-nm Nd:YAG laser. Laser-induced fluorescence (LIF) was used to obtain two dimensionally resolved images of the OH radical distribution after the ignition event. These images were used to produce an animation of laser ignition and early flame kernel development. Schlieren photography was used to investigate the laser-induced shock wave, hot core gas, and developing flame ball. We extend existing knowledge to high-pressure regimes relevant for internal combustion engines.

© 2004 Optical Society of America

OCIS Codes
(280.1740) Remote sensing and sensors : Combustion diagnostics
(300.2530) Spectroscopy : Fluorescence, laser-induced

ToC Category:
Research Papers

History
Original Manuscript: June 2, 2004
Revised Manuscript: August 19, 2004
Published: September 20, 2004

Citation
Maximilian Lackner, S. Charareh, F. Winter, K. Iskra, D. Rüdisser, T. Neger, H. Kopecek, and E. Wintner, "Investigation of the early stages in laser-induced ignition by Schlieren photography and laser-induced fluorescence spectroscopy," Opt. Express 12, 4546-4557 (2004)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-12-19-4546


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