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Steady and unsteady loads acting on a hydrofoil immersed in a turbulent boundary layer
Citation
Smith, SM and Pearce, BW and Brandner, PA and Clarke, DB and Moreau, DJ and Xue, Y, Steady and unsteady loads acting on a hydrofoil immersed in a turbulent boundary layer, Proceedings of the 20th Australasian Fluid Mechanics Conference (20AFMC), 5-8 December 2016, Perth, Australia, pp. 1-4. (2016) [Refereed Conference Paper]
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Copyright Statement
Copyright 2016 Australasian Fluid Mechanics Society
Official URL: http://people.eng.unimelb.edu.au/imarusic/proceedi...
Abstract
This study investigated steady and unsteady loads acting on a hydrofoil immersed in a turbulent boundary layer. Measurements were performed in a cavitation tunnel in which the hydrofoil was mounted spanwise normal from the test section ceiling, via a 6-component force balance. The turbulent boundary layer was artificially thickened via an array of transverse jets located upstream of the test section. The effect of boundary layer thickness was investigated, in which various thicknesses were generated to allow partial or full immersion of two hydrofoils, each with different aspect ratios. The effect of varying incidence and Reynolds number on the hydrodynamic loading was also investigated. Steady forces were found to be significantly affected by the scale of the boundary layer, particularly in the stall region. Identification of a broad peak in the unsteady force spectra, was made at a constant reduced frequency of 0.2. The peak was dependent on boundary layer thickness and Reynolds number. Furthermore, a low frequency stall component, superimposed over the existing broadband excitation of the boundary layer turbulence, was apparent in the spectra past stall.
Item Details
Item Type: | Refereed Conference Paper |
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Keywords: | boundary layer, hydrofoil, unsteady loading |
Research Division: | Engineering |
Research Group: | Fluid mechanics and thermal engineering |
Research Field: | Fluid mechanics and thermal engineering not elsewhere classified |
Objective Division: | Defence |
Objective Group: | Defence |
Objective Field: | Maritime |
UTAS Author: | Smith, SM (Mr Samuel Smith) |
UTAS Author: | Pearce, BW (Dr Bryce Pearce) |
UTAS Author: | Brandner, PA (Professor Paul Brandner) |
UTAS Author: | Xue, Y (Dr Yunpeng Xue) |
ID Code: | 113320 |
Year Published: | 2016 |
Deposited By: | NC Maritime Engineering and Hydrodynamics |
Deposited On: | 2016-12-21 |
Last Modified: | 2018-05-23 |
Downloads: | 0 |
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