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

Pearce, BW ORCID: 0000-0003-2189-5598, Brandner, PA ORCID: 0000-0002-6721-878X, Garg, N, Young, YL, Phillips, AW and Clarke, DB 2017 , 'The influence of bend-twist coupling on the dynamic response of cavitating composite hydrofoils', paper presented at the 5th International Symposium on Marine Propulsors (SMP’17), 12-15 June 2017, Helsinki, Finland.

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Abstract

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.

Item Type: Conference or Workshop Item (Paper)
Authors/Creators:Pearce, BW and Brandner, PA and Garg, N and Young, YL and Phillips, AW and Clarke, DB
Keywords: cavitation, dynamic response, composite hydrofoil, bend-twist coupling, FSI, lock-in
Journal or Publication Title: Proceedings of the Fifth International Symposium on Marine Propulsors
Publisher: SMP Chair Committee
Copyright Information:

Copyright 2017 SMP chair committee

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