The performance and hydrodynamics in unsteady flow of a horizontal axis tidal turbine

Abuan, Binoe E.; Howell, Robert J.

doi:10.1016/j.renene.2018.09.045

Cited by 27 publications

(7 citation statements)

References 20 publications

(24 reference statements)

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“…The frame motion condition was applied as the interface condition between the fluid and the turbine. All the mentioned boundary conditions were reported as being used by other researchers in similar investigations [16,45,46].…”

Section: Computational Domain and Boundary Conditionmentioning

confidence: 99%

“…This turbulence model combined the K-ω and standard K-ω models to simultaneously consider the free flow and flow limited to the wall. Hence, it is more accurate and reliable for more extensive classifications of streams around the airfoils, such as conventional sound waves and negative gradient fluxes [10], with acceptable precision [14,16,45]. Therefore, this model was employed to run the simulations under CFD analysis through the ANSYS-FLUENT software.…”

Section: Cfd Analysismentioning

confidence: 99%

See 1 more Smart Citation

On the Performance of Small-Scale Horizontal Axis Tidal Current Turbines. Part 1: One Single Turbine

et al. 2020

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The blade number of a current tidal turbine is one of the essential parameters to increase the stability, performance and efficiency for converting tidal current energy into rotational energy to generate electricity. This research attempts to investigate the effect of blade number on the performance of a small-scale horizontal tidal current turbine in the case of torque, thrust coefficient and power coefficient. Towards this end and according to the blade element momentum theory, three different turbines, i.e., two, three and four-bladed, were modeled using Solidworks software based on S-814 airfoil and then exported to the ANSYS-FLUENT for computational flow dynamics (CFD) analysis. SST-K-ω turbulence model was used to predict the turbulence behavior and several simulations were conducted at 2 ≤ tip speed ratio ≤ 7. Pressure contours, turbulence kinetic energy contours, cut-in-speed-curves, and streamlines around the blades and rotors were extracted and compared to provide an ability for a deep discussion on the turbine performance. The results show that in the case of obtainable power, the optimal value of tip speed ratio is around 5, so that the maximum power was achieved for the four-bladed turbine. Out of optimal condition, higher blade number and lower blade number turbines should be used at less than and greater than the optimal values of tip speed ratio, respectively. The results of simulations for the three-bladed turbine were validated against the experimental data with good agreement.

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Section: Computational Domain and Boundary Conditionmentioning

confidence: 99%

Section: Cfd Analysismentioning

confidence: 99%

On the Performance of Small-Scale Horizontal Axis Tidal Current Turbines. Part 1: One Single Turbine

et al. 2020

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“…The unsteady flow effects on a horizontal axis tidal turbine were investigated in [58]. The performance of the rotor was studied when subjected to periodic inflow conditions.…”

Section: Hydrodynamic Design and Performance Analysis Of Hahtsmentioning

confidence: 99%

A review on computational fluid dynamics modeling and simulation of horizontal axis hydrokinetic turbines

Laı́n

Contreras

López

2019

J Braz. Soc. Mech. Sci. Eng.

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Hydrokinetic energy conversion devices provide the facility to capture energy from water flow without the need of large dams, impoundments, channels or deviation of the water as in conventional hydroelectric centrals. Hydrokinetic systems are intended to be used in streams, either natural (rivers, estuaries, marine currents) or artificially built channels. This article reviews the advances made over the last 10-15 years regarding the three-dimensional computational fluid dynamics modeling and simulation of this type of turbines. Technical aspects of model design, employed boundary conditions, solution of the governing equations of the water flow through the hydrokinetic turbine and assumptions made during the simulations are thoroughly described. We hope that this review will encourage new computational investigations about hydrokinetic turbines that contribute to their continuous improvement, development and implementation aimed to sustainable use of water resources and addressed to solve the problem of lack of electricity supply in small, isolated populations. Keywords CFD • Hydrokinetic turbine • Simulation • Horizontal axis turbine • Axial flow water turbine List of symbols A Cross-sectional area of the rotor (m 2) A ∞ Water area upstream the turbine (m 2) A d Actuator disk area (m 2) A disk Disk area (m 2) A exit Diffuser exit area (m 2) A w Water area downstream the turbine (m 2) a Axial flow induction factor

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“…Also, the wake that develops downstream cannot be resolved with BEM. On the other hand, three-dimensional, transient fluid flow computations provide an accurate representation of the wake downstream the rotor (Abuan and Howell, [12]).…”

Section: Introductionmentioning

confidence: 99%

Three-Bladed Horizontal Axis Water Turbine Simulations with Free Surface Effects

Rodríguez

Benavides-Morán

Laı́n

2021

International Journal of Applied Mechanics and Engineering

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The water level above a hydrokinetic turbine is likely to vary throughout the season and even along the day. In this work, the influence of the free surface on the performance of a three bladed horizontal-axis turbine is explored by means of a three-dimensional, transient, two-phase flow computational model implemented in the commercial CFD software ANSYS Fluent 19.0. The k – ω SST Transition turbulence model coupled with the Volume of Fluid (VOF) method is used to track the air-water interface. The rotor diameter is D = 0 8m. Two operating conditions are analyzed: deep tip immersion (0.55D) and shallow tip immersion (0.19D). Three tip speed ratios are evaluated for each immersion. Simulation results show a good agreement with experimental data reported in the literature, although the computed torque and thrust coefficients are slightly underestimated. Details of the free surface dynamics, the flow past the turbine and the wake near the rotor are also discussed.

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The performance and hydrodynamics in unsteady flow of a horizontal axis tidal turbine

Cited by 27 publications

References 20 publications

On the Performance of Small-Scale Horizontal Axis Tidal Current Turbines. Part 1: One Single Turbine

On the Performance of Small-Scale Horizontal Axis Tidal Current Turbines. Part 1: One Single Turbine

A review on computational fluid dynamics modeling and simulation of horizontal axis hydrokinetic turbines

Three-Bladed Horizontal Axis Water Turbine Simulations with Free Surface Effects

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