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

Citation

Pearce, BW and Brandner, PA and Garg, N and Young, YL and Phillips, AW and Clarke, DB, The influence of bend-twist coupling on the dynamic response of cavitating composite hydrofoils, Proceedings of the Fifth International Symposium on Marine Propulsors, 12-15 June 2017, Helsinki, Finland, pp. 803-813. (2017) [Refereed Conference Paper]

Copyright Statement

Copyright 2017 SMP chair committee

Official URL: http://www.marinepropulsors.com/proceedings.php

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 Details

Item Type:Refereed Conference Paper
Keywords:cavitation, dynamic response, composite hydrofoil, bend-twist coupling, FSI, lock-in
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ship and Platform Hydrodynamics
Objective Division:Manufacturing
Objective Group:Transport Equipment
Objective Field:Nautical Equipment (excl. Yachts)
Author:Pearce, BW (Dr Bryce Pearce)
Author:Brandner, PA (Professor Paul Brandner)
ID Code:117639
Year Published:2017
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2017-06-22
Last Modified:2018-04-19
Downloads:5 View Download Statistics

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