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

journal contribution
posted on 2023-05-20, 20:41 authored by Smith, SM, Paul BrandnerPaul Brandner, Bryce PearceBryce Pearce, James VenningJames Venning, Moreau, DJ, Clarke, DB
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.

History

Publication title

Journal of Fluids and Structures

Volume

102

Article number

103225

Number

103225

Pagination

1-22

ISSN

0889-9746

Department/School

Australian Maritime College

Publisher

Academic Press Ltd Elsevier Science Ltd

Place of publication

24-28 Oval Rd, London, England, Nw1 7Dx

Rights statement

Copyright 2021 Elsevier Ltd. All rights reserved.

Repository Status

  • Restricted

Socio-economic Objectives

Maritime; Expanding knowledge in engineering

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