Influence of surface waves on the hydrodynamic performance of a horizontal axis ocean current turbine

2020 ◽  
Vol 158 ◽  
pp. 37-48 ◽  
Author(s):  
Wenlong Tian ◽  
Xiwen Ni ◽  
Zhaoyong Mao ◽  
Tianqi Zhang
Keyword(s):  
Surface Waves ◽  
Horizontal Axis ◽  
Hydrodynamic Performance ◽  
Ocean Current ◽  
Current Turbine

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

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.

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

CFD-Based Study of a Tidal Current Turbine in a Horizontal Axis Under Regular Waves

2019 ◽  
Author(s):  
Jing Liu ◽  
Longfei Xiao ◽  
Fengmei Jing
Keyword(s):  
Tidal Current ◽  
Wave Amplitude ◽  
Horizontal Axis ◽  
Hydrodynamic Performance ◽  
Power Coefficient ◽  
Regular Waves ◽  
Dimensional Parameter ◽  
Near Surface ◽  
Tidal Current Turbine ◽  
Current Turbine

Abstract The horizontal-axis tidal current turbine is often installed in near-surface to use the high flow velocity of tidal current, and many designers have found the effect of wave on the hydrodynamic performance of tidal current turbine. The present study focuses on the hydrodynamic analysis of a tidal current turbine in a horizontal axis under the condition of regular waves, based on CFD method. The experimental data are used to verify the feasibility of the method. A non-dimensional parameter k is defined as the ratio of tip submergence to wave amplitude. It is shown that the numerical method is good to predict the hydrodynamic performance of horizontal axis turbine. By comparing the power coefficient and axial load coefficient in different tip submergence and wave amplitude, the effects of tip submergence and wave amplitude on the hydrodynamic performance of tidal current turbine are analyzed.

scholarly journals Design and Hydrodynamic Performance of a Horizontal Axis Hydrokinetic Turbine

2019 ◽  
Vol 16 (2) ◽  
pp. 6453-6469
Author(s):  
M. Nachtane ◽  
M. Tarfaoui ◽  
A. El Moumen ◽  
D. Saifaoui ◽  
H. Benyahia
Keyword(s):  
Design Feature ◽  
Complete Response ◽  
Horizontal Axis ◽  
Hydrodynamic Performance ◽  
Energy Output ◽  
Hydrodynamic Characteristics ◽  
Marine Energy ◽  
Hydrokinetic Turbine ◽  
Tidal Current Turbine ◽  
Current Turbine

Marine energy is gaining more and more interest in recent years and, in comparison to fossil energy, is very attractive due to predictable energy output, renewable and sustainable, the Horizontal Axis Hydrokinetic Turbine (HAHT) is one of the most innovative energy systems that allow transforms the kinetic energy into electricity. This work presents a new series of hydrofoil sections, named here NTSXX20, and was designed to work at different turbine functioning requirement. These hydrofoils have excellent hydrodynamic characteristics at the operating Reynolds number. The design of the turbine has been done utilising XFLR5 code and QBlade which is a Blade-Element Momentum solver with a blade design feature. Tidal current turbine has been able to capture about 50% from TSR range of 5 to 9 with maximum CPower of 51 % at TSR=6,5.   The hydrodynamics performance for the CFD cases was presented and was employed to explain the complete response of the turbine.

Numerical Analysis of Hydrodynamic Performance of FX-83-W Hydrofoil Current Turbine

2017 ◽  
Author(s):  
Yuchen Shang ◽  
Nikolaos I. Xiros
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Open Water ◽  
Hydrodynamic Performance ◽  
Ocean Current ◽  
Thrust Coefficient ◽  
Cfd Method ◽  
Three Dimensional Coordinate ◽  
Current Turbine

Ocean current flow characteristics are relatively stable and predictable, current turbine absorbs the energy of the ocean currents by the blades with a relative stable and lower angular velocity which indicates the capacity of current turbine greater than the onshore wind turbine. In this paper, the CFD method is utilized to calculate and analyze the working principle of FX-83-W current turbine. The three-dimensional coordinate of FX-83-W Hydrofoil blade surface have been calculated by MATLAB code, and 3D model has been established in Gambit. The basic control equations of CFD and its numerical solution are described, Reynolds Averaged N-S equations is used, and the realizable k-e turbulence model is introduced to solve the Reynolds stress in the RANS equation. The numerical algorithm is the finite volume method (FVM), and the numerical simulation of CFD is used to study the open water performance, leading to thrust coefficient KT and torque coefficient KQ of FX-83-W Hydrofoil. The hydrodynamic thrust and hydrodynamic power of the ocean current turbine under different sea conditions have been obtained by numerical simulation.

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