Simultaneous temperature and velocity measurement in unseeded air flows with FLEET

Matthew R. Edwards, Arthur Dogariu, Richard B. Miles

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

13 Scopus citations

Abstract

High spatial resolution measurements of local flow velocities and temperature distributions are crucial for understanding turbulent, high speed, and reacting flows. In this paper, we demonstrate that femtosecond laser electronic excitation tagging (FLEET), a recently developed molecular tagging velocimetry method can also be used to simultaneously measure temperature. A 150 femtosecond pulse populates excited molecular nitrogen states, driving significant emission in the nitrogen Second Positive and First Negative systems. Spectroscopy of emission from the excited states allows temperature to be determined from both the distribution of rotational energy and the relative strengths of the Second Positive and First Negative systems. Temperature profiles are measured to an uncertainty of 20 K and 1 mm spatial resolution between 300 and 600 K in a heated turbulent jet. FLEET temperature and velocity measurements involve separate systems and can be conducted simultaneously without interference.

Original languageEnglish (US)
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
StatePublished - Aug 19 2013
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: Jan 7 2013Jan 10 2013

Publication series

Name51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

Other

Other51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
CountryUnited States
CityGrapevine, TX
Period1/7/131/10/13

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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