Velocity and temperature measurements in mach 18 nitrogen flow at tunnel 9

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

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

Abstract

We report the first application of Femtosecond Laser Electronic Excitation Tagging (FLEET) and Coherent Anti-Stokes Raman Scattering (CARS) spectroscopy to measurement of velocity and, respectively temperature in Mach 18 nitrogen flow at the AEDC Hypervelocity Wind Tunnel 9. We have refined our measurement system used in previous testing campaigns at Mach 10 and Mach 14, to allow for simultaneous single-shot FLEET velocimetry and CARS rotational/vibrational thermometry at 1kHz repetition rate. Velocity measurements with a dynamic range of over 2 km/s have been obtained within the operational envelope of the tunnel, and the lowest measurement precision attained in freestream flow was 0.1-0.2%. We obtained estimates of the rotational temperature, Trot, and the vibrational temperature, Tvib, by fitting the experimental CARS spectra to theoretical nitrogen spectra. The results experimentally demonstrate the strong thermo-chemical non-equilibrium conditions of the freestream flow. These measurements are important in that they are used to quantify the slight changes in the freestream conditions due to the frozen vibrational energy in the Mach 18 flow.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2021 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Pages1-11
Number of pages11
ISBN (Print)9781624106095
StatePublished - 2021
EventAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021 - Virtual, Online
Duration: Jan 11 2021Jan 15 2021

Publication series

NameAIAA Scitech 2021 Forum

Conference

ConferenceAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021
CityVirtual, Online
Period1/11/211/15/21

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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