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Temperature and number density measurement in non-uniform supersonic flowfields undergoing mixing using toluene PLIF thermometry

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Abstract

Single-excitation, dual-band-collection toluene planar laser-induced fluorescence (PLIF) is used to measure temperature and number density (or partial pressure) fields in non-uniform supersonic complex flows in the presence of mixing and compressibility. The study provides a quantitative evaluation of the technique in transverse jets in supersonic crossflow (JISCF). It is found that toluene PLIF is highly effective in visualizing the structure of supersonic flows and that temperature can be accurately inferred with acceptable signal-to-noise ratios (of order 30) even when mixing occurs. The technique was applied to several JISCFs that differ by jet fluid properties with resulting different structures. In the presence of compressibility and mixing, it is found that the PLIF signal is non-unique, a feature that is used to identify the mixing region of the transverse jet. Measurement errors due to camera registration errors have also been quantified. Because of the complexity of the flowfield, it is found that minute misalignment (<0.1 pixels) between the two PLIF images can introduce measurable errors on the order of tens of Kelvins and significant errors in temperature gradients.

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Acknowledgments

This paper is based on work supported by the Department of Energy sponsored Predictive Science Academic Alliance Program (PSAAP) Center at Stanford University under award number DE-FC52-08NA28614. This work was also partially supported by the Air Force Office of Scientific Research (AFOSR) with Dr. Julian Tishkoff as technical monitor. 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. University of Michigan, Ann Arbor, MI, USA

    Mirko Gamba

  2. Stanford University, Stanford, CA, USA

    Victor A. Miller & Ronald K. Hanson

  3. Santa Clara University, Santa Clara, CA, USA

    M. Godfrey Mungal

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

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Gamba, M., Miller, V.A., Mungal, M.G. et al. Temperature and number density measurement in non-uniform supersonic flowfields undergoing mixing using toluene PLIF thermometry. Appl. Phys. B 120, 285–304 (2015). https://doi.org/10.1007/s00340-015-6136-7

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