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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2409.15836 |
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| _version_ | 1866913514492264448 |
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| author | Braun, J. Rahbari, I. Paniagua, G. Addo, P. Aye Garicano-Mena, J. Valero, E Clainche, S. Le |
| author_facet | Braun, J. Rahbari, I. Paniagua, G. Addo, P. Aye Garicano-Mena, J. Valero, E Clainche, S. Le |
| contents | A canonical wavy surface exposed to a Mach 2 flow is investigated through high-frequency Pressure Sensitive Paint (PSP), Kulite measurements, and shadowgraph imaging. The wavy surface features a compression and expansion region, two shock-boundary layer interactions, and two shock-separation regions. The unsteady characteristics of the wall pressure and shock angles are presented, demonstrating an increase in amplitude of the instabilities when traveling through the shock systems. Three-dimensional flow features, observed in PSP data, reveal a two-dimensional flow pattern. Higher-Order Dynamic Mode Decomposition and Spectral Proper Orthogonal Decomposition are implemented to dissect the different flow features, revealing several dominant low-frequency and medium-frequency phenomena. The separation region appears at frequencies with Strouhal numbers between 0.01 and 0.2, confirmed by the frequency content in the local pressure measurement using Kulites. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_15836 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Experimental characterization of shock-separation interaction over wavy-shaped geometries through feature analysis Braun, J. Rahbari, I. Paniagua, G. Addo, P. Aye Garicano-Mena, J. Valero, E Clainche, S. Le Fluid Dynamics A canonical wavy surface exposed to a Mach 2 flow is investigated through high-frequency Pressure Sensitive Paint (PSP), Kulite measurements, and shadowgraph imaging. The wavy surface features a compression and expansion region, two shock-boundary layer interactions, and two shock-separation regions. The unsteady characteristics of the wall pressure and shock angles are presented, demonstrating an increase in amplitude of the instabilities when traveling through the shock systems. Three-dimensional flow features, observed in PSP data, reveal a two-dimensional flow pattern. Higher-Order Dynamic Mode Decomposition and Spectral Proper Orthogonal Decomposition are implemented to dissect the different flow features, revealing several dominant low-frequency and medium-frequency phenomena. The separation region appears at frequencies with Strouhal numbers between 0.01 and 0.2, confirmed by the frequency content in the local pressure measurement using Kulites. |
| title | Experimental characterization of shock-separation interaction over wavy-shaped geometries through feature analysis |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2409.15836 |