Density scaling and calibration of FLEET temperature measurements

Nathan D. Calvert, Arthur Dogariu, Matthew R. Edwards, Richard B. Miles

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

Bulk gas temperature is a critical parameter in characterizing the dynamics, species concentration, quantum state and chemical reactivity of high speed flow. A myriad of techniques have been developed recently to non-intrusively and remotely measure temperature in different conditions and environments. Often these experiments require external flow seeding, are only applicable in a relatively limited range of temperature and rely on a complicated apparatus for thermometry alone. Femtosecond Laser Electronic Excitation Tagging (FLEET) avoids many of the common issues encountered with laser-based techniques and has been shown to be an effective tool for simultaneous measurements of flow velocity and temperature1,2. A spectrum of the second positive and first negative emission of molecular nitrogen is captured from a region of interest and the intensity of rotational features can be correlated to the translational gas temperature within the natural lifetime of the fluorescence. Either the experimental spectrum is fit directly to a simulation or certain portions of the spectrum are analyzed to build a database of area ratios from which temperature can be extracted. It is observed that the intensity, shape and appearance of certain prominent rovibrational features change with pressure. The present study investigates the nature of FLEET fluorescence at various temperatures and pressures and establishes a direct scaling relationship to properly account for changes in gas density to the area ratio methodology.

Original languageEnglish (US)
Title of host publication31st AIAA Aerodynamic Measurement Technology and Ground Testing Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103643
DOIs
StatePublished - Jan 1 2015
Event31st AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 2015 - Dallas, United States
Duration: Jun 22 2015Jun 26 2015

Publication series

Name31st AIAA Aerodynamic Measurement Technology and Ground Testing Conference

Conference

Conference31st AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 2015
CountryUnited States
CityDallas
Period6/22/156/26/15

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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  • Cite this

    Calvert, N. D., Dogariu, A., Edwards, M. R., & Miles, R. B. (2015). Density scaling and calibration of FLEET temperature measurements. In 31st AIAA Aerodynamic Measurement Technology and Ground Testing Conference (31st AIAA Aerodynamic Measurement Technology and Ground Testing Conference). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2015-2564