Analytical wake model of tidal current turbine

Lam, Wei-Haur; Chen, Long; Hashim, Roslan

doi:10.1016/j.energy.2014.11.047

Cited by 52 publications

(24 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 11 shows the stream-wise velocity distribution in the transverse direction in the downstream field from x = 1D to 8D. The plots show a reasonable agreement with experimental data for the numerical results obtained by both methods, especially in the far wake region beyond x = 5D, where Gaussian distribution applies [40]. In the near wake region from x = 1D to 4D, there are some discrepancies around the wake center.…”

Section: Mean Velocity Distributionsupporting

confidence: 71%

Comparison of Actuator Line Method and Full Rotor Geometry Simulations of the Wake Field of a Tidal Stream Turbine

Lin

Zhang

et al. 2019

Water

View full text Add to dashboard Cite

This study aims to investigate the wake characteristics of a horizontal axis tidal stream turbine supported by a monopile using a numerical approach. Computational fluid dynamics (CFD) simulations based on the open source software OpenFOAM have been performed to enhance understanding of a turbine’s wake. The numerical simulations adopt both the actuator line method and the full rotor geometry method. The numerical results are found to be consistent with experimental data, although some discrepancies are observed at a distance of one rotor diameter downstream. Comparison of numerical results from both methods is performed. The results show that both methods can obtain important flow features and provide similar simulation in the wake of the turbine model. The actuator line method is able to give a better prediction in stream-wise velocity distribution, although it underestimates the turbulence intensity, circumferential velocity and vorticity magnitude slightly, compared with the full rotor geometry method. It is also found that the wake of the monopile and the rotor interact strongly in the downstream field, especially in the region immediately behind the structure. A strong interaction occurs within approximately two rotor diameters downstream.

show abstract

Section: Mean Velocity Distributionsupporting

confidence: 71%

Comparison of Actuator Line Method and Full Rotor Geometry Simulations of the Wake Field of a Tidal Stream Turbine

Lin

Zhang

et al. 2019

Water

View full text Add to dashboard Cite

show abstract

“…In Roulund's experiment of scour around pile [29], the flume width was 36 times than pile diameter, which is almost same as our flume. In addition, based on existed experimental research of flow field around tidal current turbine [16], the operational turbine can disturb flow around it, but shows little impact on flow more than 3R distance in radial direction. Hence the flume is wide enough for our experiments.…”

Section: Scaling Effects Of Experimental Setupmentioning

confidence: 99%

“…The results show that flow velocity reduced behind rotor and gradually recovered downstream. Lam et al [16] proposed a wake equation to illustrate the wake distribution of horizontal-axis turbine based on axial momentum theory and the experimental data. Flow acceleration can be clearly observed close to the rotating blade tips.…”

Section: Introductionmentioning

confidence: 99%

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

Sun

Lam

Dai

et al. 2019

Water

View full text Add to dashboard Cite

The temporal evolution of seabed scour was investigated to prevent damage around a monopile foundation for Darrieus-type tidal current turbine. Temporal scour depths and profiles at various turbine radius and tip clearances were studied by using the experimental measurements. Experiments were carried out in a purpose-built recirculating water flume associated with 3D printed turbines. The scour hole was developed rapidly in the initial process and grew gradually. The ultimate equilibrium of scour hole was reached after 180 min. The scour speed increased with the existence of a rotating turbine on top of the monopile. The findings suggested that monopile foundation and the rotating turbine are two significant considerations for the temporal evolution of scour. The scour depth is inversely correlated to the tip-bed clearance between the turbine and seabed. Empirical equations were proposed to predict the temporal scour depth around turbine. These equations were in good agreement with the experimental data.

show abstract

“…Among all the renewable energy in nature, power extraction from wind and tidal flow is an attractive choice because of the huge amount of kinetic energy available. Generally horizontal axis turbines with rotational blades are applied for large-scale electricity production [1,2]. In recent years, the development for "distributed" wind and tidal energy motivates the applications of small horizontal and vertical axis turbines.…”

Section: Introductionmentioning

confidence: 99%

Systematic investigation of the flow evolution and energy extraction performance of a flapping-airfoil power generator

Xie

Zhang

et al. 2015

Energy

View full text Add to dashboard Cite

Analytical wake model of tidal current turbine

Cited by 52 publications

References 12 publications

Comparison of Actuator Line Method and Full Rotor Geometry Simulations of the Wake Field of a Tidal Stream Turbine

Comparison of Actuator Line Method and Full Rotor Geometry Simulations of the Wake Field of a Tidal Stream Turbine

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

Systematic investigation of the flow evolution and energy extraction performance of a flapping-airfoil power generator

Contact Info

Product

Resources

About