Hydrodynamic performance and the power production of the tidal turbine by new profiles at the leading-edge tubercles

Ghazi, Mohamad Amin; Ghassemi, Hassan; Ghafari, Hamid Reza

doi:10.1080/17445302.2022.2078532

Ships and Offshore Structures

2022

DOI: 10.1080/17445302.2022.2078532

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Hydrodynamic performance and the power production of the tidal turbine by new profiles at the leading-edge tubercles

Mohamad Amin Ghazi

Hassan Ghassemi

Hamid Reza Ghafari

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2024

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Cited by 2 publications

References 17 publications

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Large eddy simulation of a marine propeller with leading edge tubercles

Posa,

Broglia,

Shi

et al. 2024

Physics of Fluids

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The results of large eddy simulations on a cylindrical grid consisting of 5.8 × 109 points are reported, dealing with marine propellers with leading edge tubercles (LETs). They are compared with the performance and flow fields of the baseline geometry without tubercles. In general, the efficiency of propulsion is not improved, but a substantial effect is produced on the development of the flow across the propeller blades. The minima of pressure on the suction side of the blades are confined in the troughs of the leading edge, with the potential of reducing the overall extent of the area of cavitation (cavitation funneling effect). In addition, local maxima of turbulence are produced on the suction side of the blades by the onset of streamwise vortices at the troughs of the LETs. Although the wake development is slightly modified across blade geometries, no obvious influence of the LETs on the major wake structures is observed. Due to their early breakup, the vortices developing across the span of the propeller blades, including those originating at the LETs, are able to affect indeed a very short extent of the propeller wake. Its dynamics is still dominated by the tip and hub vortices, as for the conventional design of the propeller. Meanwhile, the intensity of the root vortices shed by the conventional propeller is substantially reduced in the wake of the tubercled propellers, thanks to the modified geometry of the blades at their root, resulting also in a slightly slower instability of the hub vortex.

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Large eddy simulation of a marine propeller with leading edge tubercles

Posa,

Broglia,

Shi

et al. 2024

Physics of Fluids

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Effect of Various Duct Shapes and Blade Sections on the Efficiency Performance of Horizontal Axis Tidal Current Turbine

Gandomani,

Ghassemi,

2024

Polish Maritime Research

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This research emphasizes the importance of optimal design for tidal turbines under various ducts and blade sections to enhance efficiency. A Reynolds-Averaged Navier-Stokes (RANS) solver with turbulence model is used to investigate the performance of horizontal-axis tidal current turbines (HATCT) under different ducts and blade sections. Analyses were conducted using various meshes and, in several stages, to ensure the accuracy of the results. Six types of different blades sections and winglets are selected and the numerical results of thrust, torque and power coefficients are compared. demonstrating the accepTable accuracy of this analytical method. It is indicated that the effect of the winglet caused to increase the power coefficient. The numerical results were compared and validated with experimental data and found in good agreement. Finally, the effect of the different duct shapes with turbine type 1 at TSR = 5 is obtained with significant results of the power coefficient.

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Hydrodynamic performance and the power production of the tidal turbine by new profiles at the leading-edge tubercles

Cited by 2 publications

References 17 publications

Large eddy simulation of a marine propeller with leading edge tubercles

Large eddy simulation of a marine propeller with leading edge tubercles

Effect of Various Duct Shapes and Blade Sections on the Efficiency Performance of Horizontal Axis Tidal Current Turbine

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