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

Zhang, Tianming; Lam, Wei-Haur; Cui, Yonggang; Jiang, Jinxin; Sun, Chong; Guo, Jianhua; Ma, Yanbo; Wang, Shuguang; Lam, Su Shiung; Hamill, Gerard

doi:10.3390/en12122450

Cited by 11 publications

(2 citation statements)

References 34 publications

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“…To further discuss the maximum scour depth and scour hole profiles, a comparison of scourhole profiles along the upstream-downstream symmetry line of different types of scour is shown in Figure 17. The experimental and CFD data of scour at piers measured by Roulund et al [12] and the experimental data measured by Zhang et al [9] were selected for comparison. It can be seen that the simulated maximum scour depth (1.96D) was 27% deeper than horizontal-axis turbine scour depth The results show that scour depth around tidal current turbines was deeper than scour at piles.…”

Section: Maximum Scour Depthmentioning

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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Section: Maximum Scour Depthmentioning

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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“…proposed two equations to predict the mean velocity within the wake of a vertical-axis turbine [19]. Some researches including the scour induced by turbine wake was also studied by Zhang et al [20] and Sun et al [21].…”

Section: Wake Structure Model Of Horizontal-axis Tidal Turbinementioning

confidence: 99%

Semi-empirical wake structure model of rotors using joint axial momentum theory and DES-SA method

et al. 2019

Self Cite

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CFD simulation with DES-SA turbulence model are conducted to investigate the wake velocity characteristics. The turbine wake velocity distribution of axial, tangential and radial component is analysed by comparing numerical results with previous the experimental and theoretical results. The axial velocity component is continuously recovered along the axial direction. Based on the position of minimum axial velocity, turbine wake can be divided into two zones: zone of flow establishment and zone of established flow. In the zone of flow establishment, two-dipped velocity valleys of the axial velocity distribution appear along the radial direction. These two valleys are combined to one valley at the rotation axis in the zone of established flow. The tangential velocity component is the second largest and the radial velocity component accounts for only a small proportion. Both of tangential and radial velocity decreases along the axial direction. Two velocity peaks of both tangential and radial velocity appear along the radial direction. Several empirical equations of turbine wake are proposed to describe the velocity distribution.

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Actuator line method flow structures and morphology interaction around a monopile-supported tidal stream turbine using the actuator line–Sediment transport coupling simulation

Lin,

Zhang,

Zheng

et al. 2024

J Hydrodyn

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

Cited by 11 publications

References 34 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

Semi-empirical wake structure model of rotors using joint axial momentum theory and DES-SA method

Actuator line method flow structures and morphology interaction around a monopile-supported tidal stream turbine using the actuator line–Sediment transport coupling simulation

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