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The influence of bend-twist coupling on the dynamic response of cavitating composite hydrofoils

conference contribution
posted on 2023-05-23, 12:09 authored by Bryce PearceBryce Pearce, Paul BrandnerPaul Brandner, Garg, N, Young, YL, Phillips, AW, Clarke, DB
Cavity shedding frequencies and structural response of a rigid metal hydrofoil and two flexible composite hydrofoils are investigated in a cavitation tunnel. All three hydrofoils have identical geometry with a trapezoidal planform, span of 0.3 m, 0.12 m root chord tapering to 0.06 m tip chord and constant NACA0009 section. The composite hydrofoils have -30° and +30° nominal fibre alignment to give positive and negative bend-twist coupling respectively. The hydrofoils were tested at a fixed chord based Reynolds number of 800,000, a fixed incidence of 6◦ and a range of cavitation numbers from inception to a supercavity. The cavity shedding frequencies and coupled structural response of each hydrofoil were measured using highspeed photography and dynamic force measurement using a six-component force balance. Cavity lengths on the rigid and flexible hydrofoils are compared with classical analytical theory. Both composite hydrofoils exhibited lock-in behaviour: the +30° hydrofoil at frequencies of 1/2 and 3/2 of the first natural frequency and the -30° hydrofoil at 1/2 of the first natural frequency only. At low cavitation numbers, all three hydrofoils display lock-in at the lower frequency indicating that cavity shedding dynamics dominates over any FSI response in this region.

History

Publication title

Proceedings of the Fifth International Symposium on Marine Propulsors

Editors

smp

Pagination

803-813

Department/School

Australian Maritime College

Publisher

SMP Chair Committee

Place of publication

Finland

Event title

5th International Symposium on Marine Propulsors (SMP’17)

Event Venue

Helsinki, Finland

Date of Event (Start Date)

2017-06-12

Date of Event (End Date)

2017-06-15

Rights statement

Copyright 2017 SMP chair committee

Repository Status

  • Restricted

Socio-economic Objectives

Nautical equipment

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    University Of Tasmania

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