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Steady and unsteady loading on a hydrofoil immersed in a turbulent boundary layer

Smith, SM, Brandner, PA ORCID: 0000-0002-6721-878X, Pearce, BW ORCID: 0000-0003-2189-5598, Venning, JA ORCID: 0000-0002-4097-2168, Moreau, DJ and Clarke, DB 2021 , 'Steady and unsteady loading on a hydrofoil immersed in a turbulent boundary layer' , Journal of Fluids and Structures, vol. 102 , pp. 1-22 , doi: 10.1016/j.jfluidstructs.2021.103225.

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Abstract

The steady and unsteady loads acting on a hydrofoil immersed in a turbulent boundary layer have been investigated. Measurements were performed in a cavitation tunnel in which the hydrofoil was mounted from the test section ceiling, via a 6-component force balance. Two NACA0012 hydrofoil models with trapezoidal planforms and aspect ratios of 2.4 and 1.2 were examined. The ceiling turbulent boundary layer was artificially thickened via an array of transverse jets located upstream of the test section. Thickening the ceiling boundary layer allowed for varying levels of hydrofoil immersion (nominally up to 100%) to be studied. In addition to the level of immersion, the effect of varying incidence and Reynolds number on the hydrodynamic loading normal to the chord was also investigated. Steady forces were found to be significantly affected by the relative scale of the boundary layer, particularly in the stall region. A broadband peak in the unsteady normal force spectra was observed at a constant reduced frequency of 0.2. The relative peak amplitude was found to be dependent on the boundary layer thickness to hydrofoil span ratio and Reynolds number. As the incidence is increased past stall, a low-frequency power increase was observed which was superimposed over the existing broadband excitation induced by the ceiling boundary layer.

Item Type: Article
Authors/Creators:Smith, SM and Brandner, PA and Pearce, BW and Venning, JA and Moreau, DJ and Clarke, DB
Keywords: unsteady loading, turbulent boundary layer, hydrofoil, piezoelectric
Journal or Publication Title: Journal of Fluids and Structures
Publisher: Academic Press Ltd Elsevier Science Ltd
ISSN: 0889-9746
DOI / ID Number: 10.1016/j.jfluidstructs.2021.103225
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Copyright 2021 Elsevier Ltd. All rights reserved.

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