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Experiments in Fluids

, 56:115 | Cite as

Toluene-based planar laser-induced fluorescence imaging of temperature in hypersonic flows

  • D. Estruch-Samper
  • L. Vanstone
  • R. Hillier
  • B. Ganapathisubramani
Research Article

Abstract

Planar laser-induced fluorescence imaging is carried out in a hypersonic gun tunnel at a freestream Mach number of 8.9 and Reynolds number of \(47.4 \times 10^6\,\hbox {m}^{-1}\) (\(N_2\) is the test gas). The fluorescence of toluene \((C_7H_8)\) is correlated with the red shift of the emission spectra with increasing temperature. A two-colour approach is used where, following an excitation at 266 nm, emission spectra at two different bands are captured in separate runs using two different filters. Two different flow fields are investigated using this method: (i) hypersonic flow past a blunt nose, which is characterised by a bow shock with strong entropy effects, and (ii) an attached shock-wave/boundary-layer interaction induced by a flare located further downstream on the same blunt cylinder body. Measurements from as low as the freestream temperature of \(68.3\) K all the way up to \(380\) K \((T_{\infty }-5.6T_{\infty })\) are obtained. The uncertainty at the higher temperature level is approximately \(\pm 15\) %, while at the low end of the temperature, an additional \(\pm 15\) % uncertainty is expected. Application of the technique is further challenged at high temperatures due to the exponentially reduced fluorescence quantum yields and the occurrence of toluene pyrolysis near the stagnation region (\(T_\mathrm{o}=1150\) K). Overall, results are found to be within \(10\) % agreement with the expected distributions, thus demonstrating suitability of the technique for hypersonic flow thermometry applications in low-enthalpy facilities.

Keywords

Fluorescence Quantum Yield Hypersonic Flow Blue Filter High Fluorescence Quantum Yield PLIF Image 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was carried out under the Engineering and Physical Sciences Research council (EPSRC) grant EP/H020853/1 and made use of the EPSRC Engineering instrument Pool to borrow the iCCD spectrometer and iCCD imaging camera.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • D. Estruch-Samper
    • 1
    • 2
  • L. Vanstone
    • 1
  • R. Hillier
    • 1
  • B. Ganapathisubramani
    • 3
  1. 1.Department of AeronauticsImperial College LondonLondonUK
  2. 2.Department of Mechanical EngineeringNational University of SingaporeSingaporeSingapore
  3. 3.Engineering and the EnvironmentUniversity of SouthamptonSouthamptonUK

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