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Experiments in Fluids
Erschienen in: Experiments in Fluids 1/2004

01.07.2004 | Original

Multiline hydroxyl tagging velocimetry measurements in reacting and nonreacting experimental flows

verfasst von: L. A. Ribarov, J. A. Wehrmeyer, S. Hu, R. W. Pitz

Erschienen in: Experiments in Fluids | Ausgabe 1/2004

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Abstract

A compact micro-lens optical system is developed that produces a 7×7 multi-line optical grid for Hydroxyl Tagging Velocimetry (HTV) and generates at least 49 resolvable velocity vectors. Single-photon photodissociation of ground-state H2O by a ~193-nm ArF excimer laser “writes” a 7×7 beam molecular grid with very long gridlines of superequilibrium OH and H photoproducts in either room air flowfields or in H2-air flames due to the presence of H2O vapor. The displaced OH tag line positions are revealed through fluorescence by A 2 Σ + (v′=0)←X 2 Π i (v″=0) OH excitation using a ~308-nm pulsed frequency-doubled dye laser. Time-of-flight analysis software determines the instantaneous velocity field in either an air nozzle or in a hydrogen/air flame. The OH tag lifetime is measured and compared to theoretical predictions using detailed chemistry. The lifetime of the OH tag is significantly enhanced by the presence of O atoms from 193-nm photodissociation of O2.
Vorheriger Artikel Effect of initial conditions on the near-field development of a round jet
Nächster Artikel Quantitative detection of turbulent reattachment using a surface mounted hot-film array

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Metadaten
Titel
Multiline hydroxyl tagging velocimetry measurements in reacting and nonreacting experimental flows
verfasst von
L. A. Ribarov
J. A. Wehrmeyer
S. Hu
R. W. Pitz
Publikationsdatum
01.07.2004
Verlag
Springer-Verlag
Erschienen in
Experiments in Fluids / Ausgabe 1/2004
Print ISSN: 0723-4864
Elektronische ISSN: 1432-1114
DOI
https://doi.org/10.1007/s00348-004-0785-3

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