Applied Physics B

, Volume 117, Issue 1, pp 401–410 | Cite as

20 kHz toluene planar laser-induced fluorescence imaging of a jet in nearly sonic crossflow

  • V. A. Miller
  • V. A. Troutman
  • M. G. Mungal
  • R. K. Hanson
Article

Abstract

This manuscript describes continuous, high-repetition-rate (20 kHz) toluene planar laser-induced fluorescence (PLIF) imaging in an expansion tube impulse flow facility. Cinematographic image sequences are acquired that visualize an underexpanded jet of hydrogen in Mach 0.9 crossflow, a practical flow configuration relevant to aerospace propulsion systems. The freestream gas is nitrogen seeded with toluene; toluene broadly absorbs and fluoresces in the ultraviolet, and the relatively high quantum yield of toluene produces large signals and high signal-to-noise ratios. Toluene is excited using a commercially available, frequency-quadrupled (266 nm), high-repetition-rate (20 kHz), pulsed (0.8–0.9 mJ per pulse), diode-pumped solid-state Nd:YAG laser, and fluorescence is imaged with a high-repetition-rate intensifier and CMOS camera. The resulting PLIF movie and image sequences are presented, visualizing the jet start-up process and the dynamics of the jet in crossflow; the freestream duration and a measure of freestream momentum flux steadiness are also inferred. This work demonstrates progress toward continuous PLIF imaging of practical flow systems in impulse facilities at kHz acquisition rates using practical, turn-key, high-speed laser and imaging systems.

Supplementary material

340_2014_5849_MOESM1_ESM.mp4 (4 mb)
Supplementary material 1 (mp4 4131 KB)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • V. A. Miller
    • 1
  • V. A. Troutman
    • 1
  • M. G. Mungal
    • 1
    • 2
  • R. K. Hanson
    • 1
  1. 1.High Temperature Gasdynamics LabStanford UniversityStanfordUSA
  2. 2.School of EngineeringSanta Clara UniversitySanta ClaraUSA

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