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Applied Optics

Applied Optics


  • Vol. 38, Iss. 33 — Nov. 20, 1999
  • pp: 6912–6917

Flame flow tagging velocimetry with 193-nm H2O photodissociation

Joseph A. Wehrmeyer, Lubomir A. Ribarov, Douglas A. Oguss, and Robert W. Pitz  »View Author Affiliations

Applied Optics, Vol. 38, Issue 33, pp. 6912-6917 (1999)

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In a new nonintrusive, instantaneous flow tagging method called hydroxyl tagging velocimetry (HTV), a molecular grid of hydroxyl (OH) radicals is written into a flame and the displaced grid is imaged at a later time to give the flame’s velocity profile. Single-photon photodissociation of vibrationally excited H2O, when a 193-nm ArF excimer laser is used, produces a tag line of superequilibrium OH and H photoproducts in a high-temperature flow field that itself may contain ambient OH. The tag line OH concentration is composed mostly of direct OH photoproducts, but OH is also indirectly produced through H photoproduct reactions with oxygen-bearing species. For lean and modestly rich flames the OH tag lifetime is of the order of 1 ms. For very rich H2-air flames (equivalence ratio of 4.4) the lifetime drops to 200 ns. After displacement the position of the OH tag line is revealed through fluorescence caused by OH (AX) (3 ← 0) excitation by using a 248-nm tunable KrF excimer laser. A HTV grid of multiple tag lines, providing multipoint velocity information, is experimentally demonstrated in a turbulent H2/N2–air diffusion flame.

© 1999 Optical Society of America

OCIS Codes
(280.1740) Remote sensing and sensors : Combustion diagnostics
(280.2470) Remote sensing and sensors : Flames
(280.2490) Remote sensing and sensors : Flow diagnostics
(280.7250) Remote sensing and sensors : Velocimetry
(300.6450) Spectroscopy : Spectroscopy, Raman

Original Manuscript: April 12, 1999
Revised Manuscript: August 11, 1999
Published: November 20, 1999

Joseph A. Wehrmeyer, Lubomir A. Ribarov, Douglas A. Oguss, and Robert W. Pitz, "Flame flow tagging velocimetry with 193-nm H2O photodissociation," Appl. Opt. 38, 6912-6917 (1999)

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