Abstract
An experiment was performed on boundary layer suction, on a flat plate in a low turbulence wind-tunnel. This work focused on the process of ‘over-suction’ where at high suction rates, local flow structures around the suction perforations precipitate a premature laminar-to-turbulent transition instead of delaying the process. The historical ‘over-suction’ mechanism associated with widely spaced perforations, i.e. sufficiently widely spaced for local flow structures to act in isolation was studied. This high-frequency (St ~ 30–90) mechanism was identified and found to dominate in the absence of a pre-established transition front; however, where the natural transition front is pre-located close to the suction array (in the absence of suction): it was found that the dominant mechanism of ‘over-suction’ changed. The dominant modes during this new process was found to be at low frequency (St ~ 0.3–6). These low frequency modes appeared to be associated with inflectional instability, being sensitive to inflection points in wall normal profile of the span-wise mean velocity. The implications of this work is that the natural transition front location will need to be accounted for in the avoidance of ‘over-suction’ in the design of boundary layer suction systems.
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Acknowledgments
The Authors would like to thank Prof. Michael Gaster for his advice and support throughout this project. Gratitude is also extended to innova-teUK and ESPRC for funding this project under the ALFET (grant ref. 113022, coordinated by Airbus) and LFC-UK (grant ref. EP/I037946/1, led by Imperial College) and NWTF (grant ref. EP/L024888/1, led by Imperial College) programs respectively.
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Crowley, B., Atkin, C. (2022). Effect of Discrete Widely Spaced Suction on a Transitioning Flow at High Suction Rates. In: Sherwin, S., Schmid, P., Wu, X. (eds) IUTAM Laminar-Turbulent Transition. IUTAM Bookseries, vol 38. Springer, Cham. https://doi.org/10.1007/978-3-030-67902-6_31
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DOI: https://doi.org/10.1007/978-3-030-67902-6_31
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