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 H_(2)O, when a 193-nm ArF excimer laser is used, produces a tag line of superequilibrium OH and H photo-products in a high-temperature flow field'that itself may contain ambient OH. The tag line OH con-centration 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 I ms. For very rich H_(2)-air flames (equivalence ratio of 4.4) the lifetime drops to 200 ns. Aider displacement the position of the OH tag line is revealed through fluorescence caused by OH (A-X) (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 H_(2)/N(2-) air diffusion flame.
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