Abstract
A new molecular-based velocity method is developed for high-temperature flame gases based on the hydroxyl tagging velocimetry (HTV) technique. In vibrationally excited HTV (VE-HTV), two photons from a KrF laser (248 nm) dissociate into a tag line of vibrationally excited OH (). The excited state OH tag is selectively detected in a background of naturally occurring ground state OH (). In atmospheric pressure laboratory burners, the OH () tag persists for 5–10 μs, allowing single-shot velocity measurements along a 2 cm line under lean, stoichiometric, and rich flame conditions with temperatures reaching 2300 K. Mean velocity measurements are demonstrated in a lean () premixed turbulent flame () laboratory flame. The VE-HTV method is best suited to measure high-speed velocities in hot combustion environments in the presence of background OH.
© 2014 Optical Society of America
Full Article | PDF ArticleMore Like This
Joseph A. Wehrmeyer, Lubomir A. Ribarov, Douglas A. Oguss, and Robert W. Pitz
Appl. Opt. 38(33) 6912-6917 (1999)
Lubomir A. Ribarov, Shengteng Hu, Joseph A. Wehrmeyer, and Robert W. Pitz
Appl. Opt. 44(31) 6616-6626 (2005)
Robert W. Pitz, Michael D. Lahr, Zachary W. Douglas, Joseph A. Wehrmeyer, Shengteng Hu, Campbell D. Carter, Kuang-Yu Hsu, Chee Lum, and Manoochehr M. Koochesfahani
Appl. Opt. 44(31) 6692-6700 (2005)