Temporal Evolution of Seabed Scour Induced by Darrieus-Type Tidal Current Turbine

Sun, Lei; Lam,; Dai, Ming; Hamill,

doi:10.3390/w11050896

Cited by 8 publications

(8 citation statements)

References 32 publications

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“…The main experimental parameters can be found in Table 2. More details of the experimental setup are elaborated on in the paper in Reference [10].…”

Section: Methodsmentioning

confidence: 99%

Prediction of Seabed Scour Induced by Full-Scale Darrieus-Type Tidal Current Turbine

Sun

Lam

Dai

et al. 2019

JMSE

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Scour induced by a Darrieus-type tidal current turbine was investigated by using a joint numerical and experimental method with emphasis on the scour process of a full-scale turbine. This work proposes a new numerical method to estimate turbine scour developments, followed by model validation through experimental data in the initial stage. The small-scale numerical model was further extended to a full-scale model for the prediction of turbine scour. The numerical model consists of (1) k-ω turbulence closure, (2) a sediment transport model, and (3) a sediment slide model. The transient-state model was coupled with a morphologic model to calculate scour development. A dynamic mesh updating technique was implemented, enabling the autoupdate of data for the grid nodes of the seabed at each time step. Comparisons between the numerical results and the experimental measurements showed that the proposed model was able to capture the main features of the scour process. However, the numerical model underestimated about 15%–20% of the equilibrium scour depth than experimental data. An investigation of the temporal and spatial development of seabed scour around a full-scale Darrieus-type tidal current turbine is demonstrated. This work concludes that the proposed numerical model can effectively predict the scour process of tidal current turbines, and the rotating rotor has a significant impact on the equilibrium scour depth for full-scale turbines.

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“…The main experimental parameters can be found in Table 2. More details of the experimental setup are elaborated on in the paper in Reference [10].…”

Section: Methodsmentioning

confidence: 99%

Prediction of Seabed Scour Induced by Full-Scale Darrieus-Type Tidal Current Turbine

Sun

Lam

Dai

et al. 2019

JMSE

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show abstract

“…It may vary from time to time. In order to ensure that the TCT can work effectively all the time and avoid the scour effects due to propeller jet velocities [26] [27] and the negative impact of TCT on reducing scour pit depths [28] [29], the TCT will be suspended from a rotating platform, which can rotate around the monopile foundation of the OWT to ensure that the rotor plane of the TCT always faces the direction of the tidal current. The schematic diagram of the proposed technique is shown in Fig.2.…”

Section: Fundamental Mechanism Of the New Countermeasurementioning

confidence: 99%

A feasibility study of reducing scour around monopile foundation using a tidal current turbine

et al. 2021

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“…Chen and Lam [5] studied the shadowing effect of a turbine rotor and showed that the velocity of a slipstream is accelerated by about 105%. Previous studies have suggested the presence of tidal turbine effects on seabed scouring [20][21][22][23]. Giles et al [24] showed that flow is suppressed due to blockage and accelerates to balance mass flow and velocity.…”

Section: Introductionmentioning

confidence: 99%

Tip-Bed Velocity and Scour Depth of Horizontal-Axis Tidal Turbine with Consideration of Tip Clearance

et al. 2019

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The scouring by a tidal turbine is investigated by using a joint theoretical and experimental approach in this work. The existence of a turbine obstructs a tidal flow to divert the flow passing through the narrow channel in between the blades and seabed. Flow suppression is the main cause behind inducing tidal turbine scouring, and its accelerated velocity is being termed as tip-bed velocity (Vtb). A theoretical equation is currently proposed to predict the tip-bed velocity based on the axial momentum theory and the conservation of mass. The proposed tip-bed velocity equation is a function of four variables of rotor radius (r), tip-bed clearance (C), efflux velocity (V0) and free flow velocity (V∞), and a constant of mass flow coefficient (Cm) of 0.25. An experimental apparatus was built to conduct the scour experiments. The results provide a better understanding of the scour mechanism of the horizontal axis tidal turbine-induced scour. The experimental results show that the scour depth is inversely proportional to tip-bed clearance. Turbine coefficient (Kt) is proposed based on the relationship between the tip-bed velocity and the experimental tidal turbine scour depth. Inclusion of turbine coefficient (Kt) into the existing pier scour equations can predict the maximum scour depth of a tidal turbine with an error range of 5–24%.

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Temporal Evolution of Seabed Scour Induced by Darrieus-Type Tidal Current Turbine

Cited by 8 publications

References 32 publications

Prediction of Seabed Scour Induced by Full-Scale Darrieus-Type Tidal Current Turbine

Prediction of Seabed Scour Induced by Full-Scale Darrieus-Type Tidal Current Turbine

A feasibility study of reducing scour around monopile foundation using a tidal current turbine

Tip-Bed Velocity and Scour Depth of Horizontal-Axis Tidal Turbine with Consideration of Tip Clearance

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