Generating controllable velocity fluctuations using twin oscillating hydrofoils: experimental validation

sam harding, greg payne, Ian Bryden

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    Abstract

    A method for generating controllable two-dimensional velocity fluctuations using two pitching foils was derived theoretically in a previous companion paper. The present work describes the experimental implementation of the method. The experiments are carried out in a re-circulating water channel optimised to provide low turbulence intensity in the incoming flow. Velocities are measured using an acoustic Doppler velocimeter. The pitching motions of the foils are position-controlled using a closed-loop control system. Two velocity fluctuation patterns are investigated. They consist of a combination
    of sinusoidal components. Theoretical predictions and experimental ,measurements are compared in the time and frequency domain. Although some discrepancies are observed, the agreement is generally good and therefore validates the theoretical method for the conditions investigated.
    Original languageEnglish
    Pages (from-to)113 to 123
    Number of pages11
    JournalJournal of Fluid Mechanics
    Volume750
    Early online date30 May 2014
    DOIs
    Publication statusPublished - Jul 2014

    Keywords

    • vortex flows
    • vortex streets
    • wakes/jets

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