Abstract
An initial study of the effects vortex generators (VGs) have on the mitigation of vortex-induced vibrations (VIVs) of hydrofoils have been performed at the Waterpower laboratory of the Norwegian University of Science and Technology. The VGs are placed close to the trailing edge of a blunt hydrofoil. Reasonable design parameters of the VGs were found from the literature with regard to which would induce the strongest vortices with the lowest drag. Vibration frequencies of the hydrofoil were measured using flush mounted strain gauges located close to the trailing edge. This paper presents the design of the VGs and some initial results of the experiments performed with these devices. The preliminary results indicate a possible mitigation of VIVs. This could be because of the interference between the primary vortices generated by the hydrofoil and the longitudinal vortices generated by the VGs, but further work is necessary to make a conclusion.
Highlights
As the demand for energy is increasing every day, it is important to look at ways of making the process of producing and utilising energy as cost-efficient as possible
An initial study of the effects vortex generators (VGs) have on the mitigation of vortex-induced vibrations (VIVs) of hydrofoils have been performed at the Waterpower laboratory of the Norwegian University of Science and Technology
This paper presents the design of the VGs and some initial results of the experiments performed with these devices
Summary
As the demand for energy is increasing every day, it is important to look at ways of making the process of producing and utilising energy as cost-efficient as possible. Devices put in a flow tend to experience vibrations known as vortex-induced vibrations (VIVs). When such vibrations approach the natural frequency of such devices, resonance, inducing wear and failure may occur. As a means of studying the mitigation of these VIVs, it has been proposed to attach vortex generators (VGs) at the trailing edge of a simple hydrofoil. The goal with these VGs is to generate strong longitudinal vortices which can interfere with the uniformity of the Karman vortex street, which is formed in the wake of the hydrofoil.
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