Abstract
Simultaneous high-speed quantitative imaging of mixture fraction and velocity is demonstrated using the fourth- and second-harmonic outputs, respectively, of a burst-mode Nd:YAG laser. A tenfold increase in the record length and 16-fold increase in per-pulse energy are achieved compared with previous measurements of mixture fraction using burst-mode and continuously pulsed diode-pumped solid-state lasers, respectively. The high output energy is used for quantitative, high-speed mixture-fraction imaging with acetone planar laser-induced fluorescence, which also enables simultaneous particle-based velocimetry without interference from particle scattering. A semiquantitative model is used to determine the limitations on fourth-harmonic output energy due to the effects of transient absorption and thermal phase mismatch over a range of repetition rates. Data are presented for mixing within a turbulent jet (Reynolds number of 15,000) and are validated by comparisons with known turbulent mixing laws and previously published data.
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Acknowledgments
Funding was provided, in part, by the Air Force Office of Scientific Research (Dr. Chiping Li, Program Manager) and the Air Force Research Laboratory under contract No. FA8650-12-C-2200. The authors also thank D. Diaz, M. Johnson, and A. Barrow of Iowa State University. J. Miller is currently a National Research Council Research Associate at the Air Force Research Laboratory, Aerospace Systems Directorate. This manuscript has been approved for public release (88ABW-2013-1521).
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Miller, J.D., Michael, J.B., Slipchenko, M.N. et al. Simultaneous high-speed planar imaging of mixture fraction and velocity using a burst-mode laser. Appl. Phys. B 113, 93–97 (2013). https://doi.org/10.1007/s00340-013-5665-1
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DOI: https://doi.org/10.1007/s00340-013-5665-1