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

2019 ◽  
Vol 7 (10) ◽  
pp. 342 ◽  
Author(s):  
Sun ◽  
Lam ◽  
Dai ◽  
Hamill
Keyword(s):  
Experimental Data ◽  
Numerical Model ◽  
Tidal Current ◽  
Full Scale ◽  
Scale Model ◽  
Small Scale ◽  
Scour Depth ◽  
Equilibrium Scour Depth ◽  
Tidal Current Turbine ◽  
Current Turbine

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.

Preliminary Results of a Vortex Method for Stand-Alone Vertical Axis Marine Current Turbine

2007 ◽  
Author(s):  
Ye Li ◽  
Sander M. Calisal
Keyword(s):  
Wind Turbine ◽  
Tidal Current ◽  
Vortex Method ◽  
Vertical Axis ◽  
Small Scale ◽  
Discrete Vortex ◽  
Analysis And Design ◽  
Tidal Turbine ◽  
Tidal Current Turbine ◽  
Current Turbine

Tidal power technology has been dwarfed once to take hold in the late 1970’s, because the early generations were expensive at small scale and some applications (such as barrages) had negative environmental impacts. In a similar working manner as a wind turbine, a tidal current turbine has been recognized as a promising ocean energy conversion device in the past two decades. However, the industrialization process is still slow. One of the important reasons is lack of comprehensive turbine hydrodynamics analysis which can not only predict turbine power but also assess impacts on the surrounding areas. Although a lot can be learned from the marine propeller or the wind turbine studies, a systematic hydrodynamics analysis on a vertical axis tidal current turbine has not been reported yet. In this paper, we employed vortex method to calculate the performance of stand-alone vertical axis tidal turbine in term of power efficiency, torque and forces. This method focuses on power prediction, hydrodynamics analysis and design, which can provide information for turbines distribution planning in a turbine farm and other related studies, which are presented in Li and Calisal (2007), a companion paper in the conference. In this method, discrete vortex method is the core for numerical calculation. Free vortex wake structure, nascent vortex and vortex decay mechanism are discussed in detail. Good agreements in turbine efficiency comparison are obtained with both the newly-designed tidal turbine test in a towing tank and early wind turbine test.

Experimental study of hydrodynamic performance of full-scale horizontal axis tidal current turbine

2017 ◽  
Vol 29 (1) ◽  
pp. 109-117 ◽  
Author(s):  
Feng-mei Jing ◽  
Wei-jia Ma ◽  
Liang Zhang ◽  
Shu-qi Wang ◽  
Xiao-hang Wang
Keyword(s):  
Experimental Study ◽  
Tidal Current ◽  
Full Scale ◽  
Horizontal Axis ◽  
Hydrodynamic Performance ◽  
Tidal Current Turbine ◽  
Current Turbine

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

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 896 ◽  
Author(s):  
Sun ◽  
Lam ◽  
Lam ◽  
Dai ◽  
Hamill
Keyword(s):  
Tidal Current ◽  
Temporal Evolution ◽  
Scour Depth ◽  
Scour Hole ◽  
3D Printed ◽  
Tidal Current Turbine ◽  
Ultimate Equilibrium ◽  
Current Turbine ◽  
Initial Process ◽  
Good Agreement

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.

CFD Study of Tidal Current Turbine Shroud for Initial Design Evaluation

2014 ◽  
Vol 679 ◽  
pp. 35-38 ◽  
Author(s):  
Azim Arshad ◽  
Shahrani Anuar ◽  
Ahmmad Shukrie ◽  
Rosdi Hussin
Keyword(s):  
Experimental Data ◽  
Tidal Current ◽  
Cfd Simulation ◽  
Ansys Fluent ◽  
Commercial Code ◽  
Simulation And Experiment ◽  
Tidal Current Turbine ◽  
Coefficient Of Velocity ◽  
Current Turbine ◽  
Good Agreement

CFD simulation of a tidal current turbine shroud was performed using Ansys FLUENT commercial code and comparison was made with experimental data. The simulation result obtained was in good agreement with the experimental data. The coefficient of velocity, Cv was in the range of approximately 1.2 to 1.4 for both simulation and experiment. The present study gave useful information on the viability of CFD simulation for the initial evaluation of shroud design performance.

Harvesting ocean energy with a small-scale tidal-current turbine and fish aggregating device in the Indonesian Archipelagos

2019 ◽  
Vol 35 ◽  
pp. 160-171 ◽  
Author(s):  
Hidemi Mutsuda ◽  
Shade Rahmawati ◽  
Naokazu Taniguchi ◽  
Takuji Nakashima ◽  
Yasuaki Doi
Keyword(s):  
Tidal Current ◽  
Small Scale ◽  
Ocean Energy ◽  
Tidal Current Turbine ◽  
Current Turbine

scholarly journals The Analysis of Tidal Current in Suramadu Bridge Pier for Marine Power Generation Test Site

Jurnal Segara ◽  
2018 ◽  
Vol 14 (2) ◽  
Author(s):  
R. Bambang Adhitya Nugraha ◽  
Erwandi Erwandi ◽  
Hendry Syahputra ◽  
La Ode Nurman Mbay
Keyword(s):  
Numerical Model ◽  
Tidal Current ◽  
Bottom Topography ◽  
Specific Area ◽  
Test Site ◽  
General Information ◽  
Ocean Energy ◽  
Area Of Interest ◽  
Tidal Current Turbine ◽  
Current Turbine

Recently, the interest in renewable ocean energy has been
growing rapidly among the ocean researchers in Indonesia. In
this paper, the pattern of tidal current in Madura Strait was analyzed and it is used as First
we present the general information of the structure of
Suramadu Bridge and explain the purpose of installing tidal current turbine between its piers. Second, we develop the numerical model of Madura Strait. The bottom topography of Madura Strait is digitized from bathymetry map produced by Indonesian Navy. A nested hydrodynamic model has been developed to refine the specific area of interest around the piles of the Suramadu Bridge. MIKE-21 program is then employed to simulate the tidal current that passes between the piles of the bridge. Next, we validate the model by conducting the field measurement of the speed of tidal current between pile no. 56 and pile no. 57. We deployed ADCP and measured the current speed for 15 days. The obtained data is then compared with the numerical model. The results show that the simulated currents has similar pattern with the measured data. We also discuss the characteristics of the simulated tidal current comparing with the ADCP results. Finally we estimate the possible produced power produced from the kinetic energy of the predicted tidal current of hydrodynamic.

Tidal Current Turbine and Related Development Problems for Indonesia

2014 ◽  
Vol 575 ◽  
pp. 610-614 ◽  
Author(s):  
Ir. Darmawi
Keyword(s):  
Tidal Current ◽  
Field Research ◽  
Transmission System ◽  
Small Scale ◽  
Turbine Engine ◽  
Gear Transmission System ◽  
Related Development ◽  
Scale Field ◽  
Tidal Current Turbine ◽  
Current Turbine

Tidal Current Turbine will be an important device of renewable energy in the upcoming decades. Hydro energy, wind energy and solar energy will mostly utilized in Indonesia in order to fulfill the energy of remote villages and remote islands and optimizing the domestic energy availability. Regarding the small scale field research conducted in the year 2012 and 2013 in Indonesia, transmission system and low rpm alternator are encountered as a significant problems in order to develop the hydro and wind turbine engine. Both parts are not yet produced locally in Indonesia. Domestic production in step-up gear transmission system of ratio 1 : 30 to 1 : 60 and low rpm alternator will fundamentally required to gain creativity in the country.

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