Pressure Fluctuations in a Hypersonic Ludwieg Tube with Free Piston Compression Heating

Birch, Byrenn J. C. ORCID: https://orcid.org/0000-0003-0625-2455 and Choudhury, Rishabh and Stern, Nathan and Buttsworth, David R. (2018) Pressure Fluctuations in a Hypersonic Ludwieg Tube with Free Piston Compression Heating. In: 22nd AIAA International Space Planes and Hypersonics Systems and Technologies Conference (AIAA 2018), 17 Sept - 19 Sept 2018, Orlando, United States.


Abstract

The free stream acoustic disturbance environment in hypersonic wind tunnel testing has a significant impact on boundary layer stability and transition to turbulence, and can influence the results of fluid-structure interaction studies. The pressure disturbance level and spectral content of the University of Southern Queensland’s Mach 6 Ludwieg tube with free piston compression facility is identified via pitot pressure measurements that were analyzed using a high-pass filter method and a power spectral density technique. Using the power spectral density method, the acoustic environment was found to change properties during the run, and it was therefore appropriate to define two root-mean-square percentage pressure fluctuation levels across frequencies from 300 Hz to 25 kHz: 2.53 % in the run period from 5 to 85 ms, and 2.98 % from 85 to 200 ms. The sensitivity of the root-mean-square results of the power spectral density analysis to the windowing technique was minimized through the assessment and selection of appropriate windowing parameters. Results obtained using this optimized windowing method compare favorably with the more traditional high pass filter analysis method.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 - 31 Dec 2021)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering (1 Jul 2013 - 31 Dec 2021)
Date Deposited: 06 Jun 2022 02:57
Last Modified: 28 Jul 2022 02:30
Uncontrolled Keywords: Acoustic disturbances; Acoustic environment; Boundary layer stabilities; Hypersonic wind tunnels; Power spectral density analysis; Power spectral density method; Pressure fluctuation; Transition to turbulence
Fields of Research (2020): 40 ENGINEERING > 4001 Aerospace engineering > 400106 Hypersonic propulsion and hypersonic aerothermodynamics
Identification Number or DOI: https://doi.org/10.2514/6.2018-5266
URI: http://eprints.usq.edu.au/id/eprint/42047

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