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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 (AFMC), 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 |
|---|---|
| Keywords: | Boundary layer, hydrofoil, unsteady loading |
| Research Division: | Engineering |
| Research Group: | Interdisciplinary Engineering |
| Research Field: | Fluidisation and Fluid Mechanics |
| Objective Division: | Defence |
| Objective Group: | Defence |
| Objective Field: | Navy |
| Author: | Smith, SM (Mr Samuel Smith) |
| Author: | Pearce, BW (Dr Bryce Pearce) |
| Author: | Brandner, PA (Associate Professor Paul Brandner) |
| 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: | 2017-03-09 |
| Downloads: | 0 |
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