Experiments in Fluids

, Volume 37, Issue 1, pp 65–74

Multiline hydroxyl tagging velocimetry measurements in reacting and nonreacting experimental flows

  • L. A. Ribarov
  • J. A. Wehrmeyer
  • S. Hu
  • R. W. Pitz
Original

DOI: 10.1007/s00348-004-0785-3

Cite this article as:
Ribarov, L.A., Wehrmeyer, J.A., Hu, S. et al. Exp Fluids (2004) 37: 65. doi:10.1007/s00348-004-0785-3

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 A2Σ+ (v′=0)←X2Πi (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.

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • L. A. Ribarov
    • 1
    • 2
  • J. A. Wehrmeyer
    • 1
  • S. Hu
    • 1
  • R. W. Pitz
    • 1
  1. 1.Department of Mechanical EngineeringVanderbilt UniversityNashvilleUSA
  2. 2.Aero-Thermodynamics GroupUnited Technologies Research CenterEast HartfordUSA