Time-resolved stagnation temperature measurements in hypersonic flows using surface junction thermocouples

Birch, Byrenn ORCID: https://orcid.org/0000-0003-0625-2455 and Buttsworth, David and Zander, Fabian ORCID: https://orcid.org/0000-0003-0597-9556 (2020) Time-resolved stagnation temperature measurements in hypersonic flows using surface junction thermocouples. Experimental Thermal and Fluid Science, 119:110177. pp. 1-13. ISSN 0894-1777

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Abstract

Fast-response coaxial surface junction thermocouples have been used to measure time-resolved stagnation temperature of the Mach 6 flow produced by the University of Southern Queensland’s hypersonic wind tunnel, TUSQ. The piston compression and the nozzle expansion of the test gas were found to be approximately isentropic for the first 65 ms of flow. Thereafter, the stagnation temperature reduces from due to the heat lost to the cold barrel, and this process can be modelled based on the measured barrel pressure history to simulate the stagnation temperature in TUSQ to within 2% of the actual value for the first 150 ms of flow. By operating the thermocouples at the flow stagnation temperature, the fluctuations of the flow stagnation temperature were investigated. A 3–4 kHz narrowband stagnation temperature fluctuation appearing after was measured, and found to be correlated with the transition to turbulence of the flow in the barrel.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 -)
Date Deposited: 27 Jul 2020 05:09
Last Modified: 08 Oct 2020 00:51
Uncontrolled Keywords: Stagnation temperature; Hypersonic flow; Heat flux; Impulse response
Fields of Research (2008): 09 Engineering > 0901 Aerospace Engineering > 090107 Hypersonic Propulsion and Hypersonic Aerodynamics
Identification Number or DOI: https://doi.org/10.1016/j.expthermflusci.2020.110177
URI: http://eprints.usq.edu.au/id/eprint/39060

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