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Steady and unsteady loads acting on a hydrofoil immersed in a turbulent boundary layer
conference contribution
posted on 2023-05-23, 11:40 authored by Smith, SM, Bryce PearceBryce Pearce, Paul BrandnerPaul Brandner, Clarke, DB, Moreau, DJ, Xue, YThis 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.
History
Publication title
Proceedings of the 20th Australasian Fluid Mechanics Conference (20AFMC)Pagination
1-4Department/School
Australian Maritime CollegePublisher
Australasian Fluid Mechanics SocietyPlace of publication
AustraliaEvent title
20th Australasian Fluid Mechanics Conference (20AFMC)Event Venue
Perth, AustraliaDate of Event (Start Date)
2016-12-05Date of Event (End Date)
2016-12-08Rights statement
Copyright 2016 Australasian Fluid Mechanics SocietyRepository Status
- Restricted