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Single- and dual-band collection toluene PLIF thermometry in supersonic flows

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Abstract

Toluene PLIF has been applied to image temperature in supersonic flowfields containing shock waves. Single- and dual-camera imaging schemes with a single excitation wavelength (266 nm) are presented, and the dual-camera scheme is optimized for imaging temperature from 300 to 900 K. The single-camera technique is implemented to verify the diagnostic and image temperature in uniform pressure, uniformly seeded flowfields; calibration is done using the signal ratio measured across an oblique shock wave of known Mach number. The dual-camera technique utilizes the redshift of toluene fluorescence with increasing temperature for temperature imaging in non-uniform pressure and temperature flowfields. Both single- and dual-camera techniques are verified and demonstrated by imaging the flow behind normal shock waves and oblique shock waves, and the dual-camera technique is further extended to image temperature in the non-uniform pressure and temperature field behind a bow shock. Good agreement is observed between the measured and expected temperature distributions calculated from ideal shock relations or CFD solutions. The accuracy of each technique is also evaluated; for dual-camera thermometry, SNR in temperature ranging from 25 at 300 K to 15 at 900 K is observed in single-shot temperature images.

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Acknowledgments

This paper is based upon work supported by the Department of Energy under the Predictive Science Academic Alliance Program (PSAAP) at Stanford University, award number DE-FC52-08NA28614. This work is also supported by the Air Force Office of Scientific Research (AFOSR). The authors would also like to thank Jon Koch, Wieland Koban, and Christof Schulz for the toluene fluorescence spectra data they graciously provided. Additionally, Victor A. Miller is supported by the Claudia and William Coleman Foundation Stanford Graduate Fellowship.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Stanford University, Stanford, CA, USA

    Victor A. Miller, M. Godfrey Mungal & Ronald K. Hanson

  2. Department of Aerospace Engineering, The University of Michigan, Ann Arbor, MI, USA

    Mirko Gamba

  3. Department of Engineering, Santa Clara University, Santa Clara, CA, USA

    M. Godfrey Mungal

Authors
  1. Victor A. Miller
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  2. Mirko Gamba
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  3. M. Godfrey Mungal
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  4. Ronald K. Hanson
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Correspondence to Victor A. Miller.

Additional information

This article is part of the Topical Collection on Application of Laser Techniques to Fluid Mechanics 2012.

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Miller, V.A., Gamba, M., Mungal, M.G. et al. Single- and dual-band collection toluene PLIF thermometry in supersonic flows. Exp Fluids 54, 1539 (2013). https://doi.org/10.1007/s00348-013-1539-x

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  • DOI: https://doi.org/10.1007/s00348-013-1539-x

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