Effect of Discrete Widely Spaced Suction on a Transitioning Flow at High Suction Rates

Crowley, B. and Atkin, C. ORCID: https://orcid.org/0000-0003-2529-1978 (2022) Effect of Discrete Widely Spaced Suction on a Transitioning Flow at High Suction Rates. In: IUTAM Laminar-Turbulent Transition. IUTAM Bookseries . Springer, pp. 359-368. ISBN 978-3-030-67901-9

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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.

Item Type: Book Section
Additional Information: Funding Information: 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.
Uncontrolled Keywords: civil and structural engineering,automotive engineering,materials science(all),aerospace engineering,acoustics and ultrasonics,mechanics of materials,mechanical engineering ,/dk/atira/pure/subjectarea/asjc/2200/2205
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Depositing User: LivePure Connector
Date Deposited: 20 Jul 2022 12:30
Last Modified: 12 Aug 2022 06:31
URI: https://ueaeprints.uea.ac.uk/id/eprint/86725
DOI: 10.1007/978-3-030-67902-6_31

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