Wake characteristics in high solidity horizontal axis hydrokinetic turbines: a comparative study between experimental techniques and numerical simulations

Macías, Marianela Machuca; Mendes, Rafael C. F.; Pereira, Michael; Dobrev, Ivan; Oliveira, Taygoara F.; Brasil Junior, Antonio C. P.

doi:10.1007/s40430-023-04590-3

J Braz. Soc. Mech. Sci. Eng.

2023

DOI: 10.1007/s40430-023-04590-3

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Wake characteristics in high solidity horizontal axis hydrokinetic turbines: a comparative study between experimental techniques and numerical simulations

Marianela Machuca Macías,

Rafael C. F. Mendes,

Michael Pereira

et al.

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2024

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Cited by 2 publications

References 43 publications

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Numerical study of a fish swimming in hydrokinetic turbine wake

Macias,

Mendes,

Garcia-Ortiz

et al. 2024

Journal of Ocean Engineering and Science

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Numerical study of a fish swimming in hydrokinetic turbine wake

Macias,

Mendes,

Garcia-Ortiz

et al. 2024

Journal of Ocean Engineering and Science

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Influence of the tip speed ratio on the wake dynamics and recovery of axial-flow turbines

Posa,

Viola,

Broglia

2024

Physics of Fluids

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Detached eddy simulation is employed to investigate the wake development downstream of the rotor of an axial-flow turbine and its dependence on the tip speed ratio. In this study, we found that the trend of the momentum deficit as a function of the rotational speed shows opposite directions in the near wake and further downstream. While the momentum deficit in the near wake increases with the rotational speed, it decreases further downstream. For instance, we found that at six diameters downstream of the rotor the streamwise velocity in its wake recovered to about 30% of its free-stream value at the lowest simulated tip speed ratio of 4, while its recovery was equal to about 65% at the largest tip speed ratio of 10. This is due to the earlier breakdown of the tip vortices. The results of the computations demonstrate indeed that mutual inductance phenomena between tip vortices, promoting pairing events and the eventual instability of the helical structures, occur at shorter downstream distances for higher values of tip speed ratio. Wake instability enhances the process of wake recovery, especially due to radial advection. Therefore, higher rotational speeds do not promote wake recovery through more intense tip vortices, but through their greater instability. Implications are important, affecting the optimal distance between rows of axial-flow turbines in array configurations: the operation at higher rotational speeds allows for smaller distances between turbines, decreasing the cost and environmental impact of farms consisting of several devices.

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Wake characteristics in high solidity horizontal axis hydrokinetic turbines: a comparative study between experimental techniques and numerical simulations

Cited by 2 publications

References 43 publications

Numerical study of a fish swimming in hydrokinetic turbine wake

Numerical study of a fish swimming in hydrokinetic turbine wake

Influence of the tip speed ratio on the wake dynamics and recovery of axial-flow turbines

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