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High-speed mixture fraction and temperature imaging of pulsed, turbulent fuel jets auto-igniting in high-temperature, vitiated co-flows

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An Erratum to this article was published on 28 December 2015

Abstract

In this manuscript, we describe an experimental approach to simultaneously measure high-speed image sequences of the mixture fraction and temperature fields during pulsed, turbulent fuel injection into a high-temperature, co-flowing, and vitiated oxidizer stream. The quantitative mixture fraction and temperature measurements are determined from 10-kHz-rate planar Rayleigh scattering and a robust data processing methodology which is accurate from fuel injection to the onset of auto-ignition. In addition, the data processing is shown to yield accurate temperature measurements following ignition to observe the initial evolution of the “burning” temperature field. High-speed OH* chemiluminescence (CL) was used to determine the spatial location of the initial auto-ignition kernel. In order to ensure that the ignition kernel formed inside of the Rayleigh scattering laser light sheet, OH* CL was observed in two viewing planes, one near-parallel to the laser sheet and one perpendicular to the laser sheet. The high-speed laser measurements are enabled through the use of the unique high-energy pulse burst laser system which generates long-duration bursts of ultra-high pulse energies at 532 nm (>1 J) suitable for planar Rayleigh scattering imaging. A particular focus of this study was to characterize the fidelity of the measurements both in the context of the precision and accuracy, which includes facility operating and boundary conditions and measurement of signal-to-noise ratio (SNR). The mixture fraction and temperature fields deduced from the high-speed planar Rayleigh scattering measurements exhibited SNR values greater than 100 at temperatures exceeding 1,300 K. The accuracy of the measurements was determined by comparing the current mixture fraction results to that of “cold”, isothermal, non-reacting jets. All profiles, when properly normalized, exhibited self-similarity and collapsed upon one another. Finally, example mixture fraction, temperature, and OH* emission sequences are presented for a variety for fuel and vitiated oxidizer combinations. For all cases considered, auto-ignition occurred at the periphery of the fuel jet, under very “lean” conditions, where the local mixture fraction was less than the stoichiometric mixture fraction (ξ < ξ s). Furthermore, the ignition kernel formed in regions of low scalar dissipation rate, which agrees with previous results from direct numerical simulations.

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Notes

  1. Perfectly stirred reactor (PSR) simulations also were performed yielding nearly identical results as shown in Fig. 6.

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Acknowledgments

Financial support within the DLR projects IVTAS and PIZ-0182-737 is gratefully acknowledged. Work at Ohio State was supported by the Combustion Energy Frontier Research Center, funded by DOE, Office of Science, Basic Energy Sciences under Award DE-SC0001198. The authors wish to thank Campbell Carter and Tonghun Lee for the use of high-speed imaging equipment.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Ohio State University, Columbus, OH, USA

    Michael J. Papageorge, Frederik Fuest & Jeffrey A. Sutton

  2. Institute of Combustion Technology, German Aerospace Center (DLR), Stuttgart, Germany

    Christoph Arndt & Wolfgang Meier

Authors
  1. Michael J. Papageorge
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  2. Christoph Arndt
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  3. Frederik Fuest
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  4. Wolfgang Meier
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  5. Jeffrey A. Sutton
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Correspondence to Jeffrey A. Sutton.

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Papageorge, M.J., Arndt, C., Fuest, F. et al. High-speed mixture fraction and temperature imaging of pulsed, turbulent fuel jets auto-igniting in high-temperature, vitiated co-flows. Exp Fluids 55, 1763 (2014). https://doi.org/10.1007/s00348-014-1763-z

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