Single shot temperature measurements using coherent anti-stokes raman scattering in mach 14 flow at the hypervelocity aedc tunnel 9

Arthur Dogariu, Laura Dogariu, Mike S. Smith, John Lafferty, Richard B. Miles

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

3 Scopus citations

Abstract

Coherent Anti-Stokes Raman Scattering (CARS) spectroscopy is used as a non-intrusive optical diagnostic technique to obtain time-resolved temperature and density measurements in high enthalpy gas flows. A femtosecond hybrid CARS system provides single shot vibrational and rotational CARS spectra of nitrogen molecules at 1kHz in low-density hypersonic flow. The system performance for temperature and density measurements has been evaluated in Mach 14 freestream nitrogen flow at the AEDC Hypervelocity Wind Tunnel 9. Measurements of translational/rotational temperature, Trot, and vibrational temperature, Tvib, are obtained by fitting the experimental CARS spectra obtained in freestream hypersonic flow to theoretical nitrogen spectra. The results experimentally demonstrate, for the first time at Tunnel 9, the strong thermo-chemical non-equilibrium conditions of the flow, with Tvib ~ 1300K and Trot ~ 50-60K.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105784
DOIs
StatePublished - Jan 1 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: Jan 7 2019Jan 11 2019

Publication series

NameAIAA Scitech 2019 Forum

Conference

ConferenceAIAA Scitech Forum, 2019
CountryUnited States
CitySan Diego
Period1/7/191/11/19

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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