Force and motion measurements of a passively oscillating hydrofoil

M. N. Mumtaz Qadri, H. Tang, Y. Liu

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


Energy extraction using flapping foils is a novel concept in the field of renewable energy, especially when the system's locomotion is fully passive and solely dependent on fluidic forces. In order to investigate this concept, a water-tunnel test rig was designed and fabricated in such a way that a hydrofoil is able to periodically heave and pitch under hydrodynamic forces. Energy extraction performance was investigated systematically through simultaneous measurements of the hydrofoil’s two degree-of-freedom (DoF) motions and hydrodynamic forces/torques, at two flow velocities (corresponding to the Reynolds Number (Re) ≈ 0.9 × 105 and 1.1 × 105). This study is focused on the effect of maximum pitching angle of the hydrofoil on the performance of the system. Hydrodynamic forces, extracted power and efficiencies were measured and calculated to evaluate the system performance at three maximum pitching angles. It was observed that increasing the free-stream velocity increased the energy extraction efficiency and power output of the system. Also, a peak appears in average power coefficient and efficiency when the maximum pitching angle is at the intermediate value.

Original languageEnglish
Title of host publicationProceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2006
PublisherAustralasian Fluid Mechanics Society
ISBN (Electronic)9781740523776
Publication statusPublished - Dec 2016
Event20th Australasian Fluid Mechanics Conference, AFMC 2006 - Perth, Australia
Duration: 5 Dec 20168 Dec 2016

Publication series

NameProceedings of the 20th Australasian Fluid Mechanics Conference, AFMC 2016


Conference20th Australasian Fluid Mechanics Conference, AFMC 2006

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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