Masini, Luke 
ORCID: 0000-0001-5495-1627, Timme, Sebastian ORCID: 0000-0002-2409-1686 and Peace, Andrew J
(2019)
Reynolds Number Effects on Wing Shock Buffet Unsteadiness.
In: AIAA Aviation 2019 Forum, 2019-6-16 - 2019-6-21, Dallas, TX.
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Abstract
The flow physics governing transonic shock-buffet onset remain disputed with their elucidation typically limited to model-scale wind-tunnel and numerical data. This paper addresses the inherent dynamics at buffet onset by complementing high-quality experimental data with scale-resolving simulation. Delayed detached-eddy simulations of a large civil aircraft wing are analysed, both at model scale to reproduce the experimental flow data (Reynolds number of 3.75 million) and at full scale to assess the influence of Reynolds number at flight conditions (27 million). The simulations are interrogated against experimental dynamic pressure-sensitive paint data, providing critical insight into the flow. Modal analysis techniques including proper orthogonal decomposition and dynamic mode decomposition are applied, revealing outboard-running waves along the shock confined to the tip region, similar to previously reported buffet cells believed to constitute the shock-buffet instability, in addition to an inboard-running low-frequency behaviour exclusive to the experimental data. The full-scale simulation highlights lower lift fluctuations owing to a further downstream shock oscillation over a smaller chordwise distance and a more limited spanwise extent, when compared to a model-scale simulation at the same angle of attack, indicating a slightly delayed buffet-onset incidence at full scale. The flow physics are similar in both cases, characterised by spanwise outboard pressure propagation in the wing-tip region at a Strouhal number of about 0.22, based on mean aerodynamic chord and reference freestream velocity. These findings further the understanding of edge-of-the-envelope flow physics and clarify scaling effects on shock buffet on a real-world configuration, ultimately informing future wing design and buffet-control strategies.
| Item Type: | Conference or Workshop Item (Unspecified) |
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| Depositing User: | Symplectic Admin |
| Date Deposited: | 18 Jun 2019 08:43 |
| Last Modified: | 19 Jan 2023 00:39 |
| DOI: | 10.2514/6.2019-2820 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3046284 |
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