Smith, Adam (2023) Spectral Proper Orthogonal Decomposition of High Speed Schlieren Images. [USQ Project]
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Abstract
Sustained hypersonic flight will enable travel between cities in a few hours however, there are many problems to be solved such as control of the boundary layer state. The University of Southern Queensland’s hypersonic testing facility regularly conducts experiments and research of hypersonic boundary interactions. The facility can be configured for a Ludwieg tube with free piston compression heating, or an atmospheric pressure blow down to vacuum operation. The facility is capable of producing hypersonic flows from Mach 2 to Mach 7 for approximately 200 ms.
High speed schlieren images of the flow field of the test section was obtained and Spectral Proper Orthogonal Decomposition (SPOD) was utilised to investigate the flow around a 7- degree half angle precision machined cone mounted in the test section with a zero angle of attack. The schlieren images captured at 450,000 fps was used to investigate the most energetic modal frequency and modal shapes/structures. The SPOD results were compared to high-speed surface pressure fluctuations which are measured at discrete locations along one azimuthal ray of the model surface.
The SPOD technique was unable to resolve the power spectrum to be consistent with the established pressure fluctuation measurements. However, the SPOD frequency image analysis was able to identify the second-mode instability. These image results suggest that SPOD could be used to study boundary layers in TUSQ. Such further studies should involve the acquisition of a high-speed camera capable of >450,000 fps. Ideally, a frame rate of at least 560,000 fps should be investigated.
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| Item Type: | USQ Project |
|---|---|
| Item Status: | Live Archive |
| Faculty/School / Institute/Centre: | Current – Faculty of Health, Engineering and Sciences - School of Engineering (1 Jan 2022 -) |
| Supervisors: | Birch, Byrenn |
| Qualification: | Bachelor of Engineering (Honours) (Mechanical) |
| Date Deposited: | 01 Oct 2025 23:41 |
| Last Modified: | 01 Oct 2025 23:41 |
| Uncontrolled Keywords: | hypersonic; schlieren images |
| URI: | https://sear.unisq.edu.au/id/eprint/53003 |
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