Simultaneous temperature, mixture fraction and velocity imaging in turbulent flows using thermographic phosphor tracer particles

Benoit Fond, Christopher Abram, Andrew L. Heyes, Andreas M. Kempf, Frank Beyrau

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This paper presents an optical diagnostic technique based on seeded thermographic phosphor particles, which allows the simultaneous two-dimensional measurement of gas temperature, velocity and mixture fraction in turbulent flows. The particle Mie scattering signal is recorded to determine the velocity using a conventional PIV approach and the phosphorescence emission is detected to determine the tracer temperature using a two-color method. Theoretical models presented in this work show that the temperature of small tracer particles matches the gas temperature. In addition, by seeding phosphorescent particles to one stream and nonluminescent particles to the other stream, the mixture fraction can also be determined using the phosphorescence emission intensity after conditioning for temperature. The experimental technique is described in detail and a suitable phosphor is identified based on spectroscopic investigations. The joint diagnostics are demonstrated by simultaneously measuring temperature, velocity and mixture fraction in a turbulent jet heated up to 700 K. Correlated single shots are presented with a precision of 2 to 5% and an accuracy of 2%.

Original languageEnglish
Pages (from-to)22118-22133
Number of pages16
JournalOptics Express
Issue number20
Early online date12 Sep 2012
Publication statusPublished - 24 Sep 2012
Externally publishedYes


  • optical diagnostic technique
  • phosphorescence
  • measuring temperature
  • tracer particles
  • turbulent jet
  • two-color method
  • turbulent flow

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