Axial Thrust Analysis of Ocean Current Turbine and Design of Hydraulic Equilibrator

Ocean stores a huge amount of energy and ocean current energy can be a viable source in future. In this article, an axial marine current turbine has been optimized to enhance its power coefficient through numerical modeling. The blade pitch-angle and number of blades are the design parameters chosen for the analysis to find the optimal design. A commercial code for CFD simulations with in-house optimization code was used for the analysis. It was found that, changing the blade pitch-angle and reducing the number of blades can improve the turbine’s coefficient of power. This is due to increase in lift and reduction of losses caused by turbulence near the downstream of the turbine. The article presents flow-simulation difficulties and characteristic curves to identify the differences between the actual and optimized turbine. The detailed flow physics is discussed and pictured in the post processed plots.

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Analyzing Resistance of Al-10Si-5Mg Alloy from Stress Corrosion Cracking for Ocean Current Turbine Applications

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/686/1/012016 ◽

2019 ◽

Vol 686 ◽

pp. 012016

Author(s):

Andre Amba Matarru ◽

Muhammad Syahid ◽

Donny Yoesgiantoro ◽

Syahril Hadi

Keyword(s):

Stress Corrosion ◽

Stress Corrosion Cracking ◽

Corrosion Cracking ◽

Ocean Current ◽

Current Turbine

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A Comparative Study on the Performance of a Horizontal Axis Ocean Current Turbine Considering Deflector and Operating Depths

Sustainability ◽

10.3390/su12083333 ◽

2020 ◽

Vol 12 (8) ◽

pp. 3333

Author(s):

Nauman Riyaz Maldar ◽

Cheng Yee Ng ◽

Lee Woen Ean ◽

Elif Oguz ◽

Ahmad Fitriadhy ◽

...

Keyword(s):

Fluid Pressure ◽

Three Dimensional ◽

Horizontal Axis ◽

Ocean Current ◽

Power Coefficient ◽

Cfd Simulations ◽

Torque Coefficient ◽

Computational Fluid Dynamics Cfd ◽

Turbine Design ◽

Current Turbine

Several different designs and prototypes of ocean current turbines have been tested over recent years. For every design test, emphasis is given to achieving an optimum power output from the flow. In this study, the performance of a Horizontal Axis Ocean Current Turbine (HAOCT) has been investigated using three-dimensional Computational Fluid Dynamics (CFD) simulations for three cases, namely, (1) a turbine without a deflector, (2) a turbine with a deflector, and (3) a turbine with a deflector operating at a higher fluid depth. The turbine design was modeled in DesignModeler software and simulations were carried out in commercial CFD software Flow-3D. The Torque Coefficient (Cm) and Power Coefficient (Cp) for the turbine have been investigated for a certain range of Tip-Speed Ratios (TSRs) in a flow velocity of 0.7 m/s. Furthermore, comparisons have been made to demonstrate the effect of the deflector on the performance of the turbine and the influence of a higher fluid pressure on the same. The results from the simulations indicate that the higher value of Cp was achieved for Case 2 as compared to the other two cases. The findings from the study indicate that the use of the deflector enhances the performance of the turbine. Furthermore, a higher fluid pressure acting on the turbine has a significant effect on its performance.

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Efficiency assessment of an experimental ocean current turbine generator

OCEANS'11 MTS/IEEE KONA ◽

10.23919/oceans.2011.6107177 ◽

2011 ◽

Cited By ~ 1

Author(s):

J. H. VanZwieten ◽

W. E. Laing ◽

C. R. Slezycki

Keyword(s):

Ocean Current ◽

Turbine Generator ◽

Efficiency Assessment ◽

Current Turbine

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Design of a prototype ocean current turbine—Part I: mathematical modeling and dynamics simulation

Ocean Engineering ◽

10.1016/j.oceaneng.2005.10.005 ◽

2006 ◽

Vol 33 (11-12) ◽

pp. 1485-1521 ◽

Cited By ~ 38

Author(s):

J. VanZwieten ◽

F.R. Driscoll ◽

A. Leonessa ◽

G. Deane

Keyword(s):

Mathematical Modeling ◽

Dynamics Simulation ◽

Ocean Current ◽

Current Turbine

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Study of Turbulence Statistics in Large-Eddy Simulations of Ocean Current Turbine Environments

Volume 9B: Ocean Renewable Energy ◽

10.1115/omae2014-24527 ◽

2014 ◽

Author(s):

Spencer R. Alexander ◽

Peter E. Hamlington

Keyword(s):

Turbulent Flows ◽

Puget Sound ◽

Large Eddy Simulations ◽

Ocean Current ◽

Design Stage ◽

Reynolds Stresses ◽

Ocean Turbulence ◽

Statistical Measures ◽

Large Eddy ◽

Current Turbine

As ocean current turbines move from the design stage into production and installation, a better understanding of oceanic turbulent flows and localized loading is required by researchers and members of industry. Consideration of realistic ocean turbulence environments, in particular, is essential for obtaining accurate and reliable predictions of ocean turbine lifetime and performance. In this study, large eddy simulations (LES) are used to model the turbulent boundary layer in which an ocean current turbine operates. The LES model captures current driving due to winds, waves, and tides, thereby providing a high degree of physical realism. Inflow and boundary conditions are designed to represent conditions during an observational campaign at Admiralty Head in Puget Sound, and comparisons are made between the LES results and available observational measurements. Further statistical measures of the LES flow fields are outlined, including vertical profiles of Reynolds stresses, turbine loading, and two point correlations. The ability of the synthetic turbulence generator TurbSim to reproduce realistic ocean turbulence is qualitatively assessed through comparisons with LES results. Finally, preliminary simulation results are presented for an ocean current turbine represented by an actuator disk.

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