A time-resolved temperature measurement system for free-piston shock tunnels

Yedhu Krishna, Suzanne Lanier Sheehe, Sean O’Byrne

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Citations (Scopus)

Abstract

This work presents the experimental preliminary results for a water-vapor based tunable diode laser absorption spectroscopy sensor to be used in a free-piston shock tunnel. The sensor uses free-space propagation of light from a vertical-cavity surface emitting laser (VCSEL) scanned at a rate of 50,000 measurements per second to determine the temperature in a hypersonic flow. The experiments were carried out in the T-ADFA free-piston shock tunnel at the University of New South Wales in Canberra, Australia. Three different flow enthalpies were examined, 13.6 MJ/kg, 10.56 MJ/kg, and 3.77 MJ/kg. Temperatures were extracted from the spectra using two methods: two line integrated absorption and nonlinear least squares fit. Both methods showed significant variations from tunnel run to the next, with standard deviations ranging from ± 36 to ± 183 K, depending on condition. Comparison of the two methods showed a discrepancy that is consistent with the nozzle flow transitioning from under expanded to over expanded flow during the test. Lastly, the nonlinear least squares fits showed an inconsistency in the HITRAN 2012 calculated strength of one of the lines.

Original languageEnglish
Title of host publication31st AIAA Aerodynamic Measurement Technology and Ground Testing Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
ISBN (Print)9781624103643
DOIs
Publication statusPublished - 2015
Externally publishedYes
Event31st AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 2015 - Dallas, United States
Duration: 22 Jun 201526 Jun 2015

Publication series

Name31st AIAA Aerodynamic Measurement Technology and Ground Testing Conference

Conference

Conference31st AIAA Aerodynamic Measurement Technology and Ground Testing Conference, 2015
Country/TerritoryUnited States
CityDallas
Period22/06/1526/06/15

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