Velocity field in the wake of a hydropower farm equipped with Achard turbines

Georgescu, Andrei-Mugur; Georgescu, Sanda-Carmen; Cosoiu, Costin Ioan; Alboiu, Nicolae Ioan; Hamzu, Al

doi:10.1088/1755-1315/12/1/012108

Cited by 8 publications

(6 citation statements)

References 1 publication

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“…A better fit seems to occur for both triangular farm models. For the C1 model, the numerical values are closer to one another, while the experimental ones (especially between the turbines) are smaller, as reported by Georgescu et al [9]. This discrepancy is probably due to the fact that for the numerical simulations we used a two-dimensional model.…”

Section: Comparison Between Experimental and Numerical Resultssupporting

confidence: 65%

“…In FLUENT, the transient flow simulations were performed as in Georgescu et al [6], for a two-dimensional fluid domain, included in the so-called "reference plane," a horizontal plane that intersects the turbines at a level z = H/4 = 0.25D relative to the median turbine plane. The computational domain in the xOy plane was built at the same scale as the experimental model, its width being equal to that of the channel where the experimental tests were conducted.…”

Section: Numerical Setup In Fluentmentioning

confidence: 99%

“…In COMSOL Multiphysics, the transient flow simulations were performed as in Georgescu et al [6], for a 2D fluid domain, included in the above defined "reference plane," at z = 0. In order to gain computational time, we used only one rotating turbine, the two other turbines (fictitious turbines) being modelled based on the action-reaction principle from a single rotating turbine model, as we will show further in Section 4.…”

Section: Numerical Setup In Comsol Multiphysicsmentioning

confidence: 99%

“…To determine the optimal grid, a preliminary grid dependency test was carried out in Georgescu et al [6]. For all farm models, the meshes from Fig.…”

Section: Numerical Setup In Comsol Multiphysicsmentioning

confidence: 99%

See 3 more Smart Citations

Efficiency of Marine Hydropower Farms Consisting of MultipleVertical Axis Cross-Flow Turbines

Georgescu

Cosoiu

et al. 2011

International Journal of Fluid Machinery and Systems

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This study focuses on the Achard turbine, a vertical axis, cross-flow, marine current turbine module. Similar modules can be superposed to form towers. A marine or river hydropower farm consists of a cluster of barges, each gathering several parallel rows of towers, running in stabilized current. Two-dimensional numerical modelling is performed in a horizontal cross-section of all towers, using FLUENT and COMSOL Multiphysics. Numerical models validation with experimental results is performed through the velocity distribution, depicted by Acoustic Doppler Velocimetry, in the wake of the middle turbine within a farm model. As long as the numerical flow in the wake fits the experiments, the numerical results for the power coefficient (turbine efficiency) are trustworthy. The overall farm efficiency, with respect to the spatial arrangement of the towers, was depicted by 2D modelling of the unsteady flow inside the farm, using COMSOL Multiphysics. Rows of overlapping parallel towers ensure the increase of global efficiency of the farm.

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Section: Comparison Between Experimental and Numerical Resultssupporting

confidence: 65%

Section: Numerical Setup In Fluentmentioning

confidence: 99%

Section: Numerical Setup In Comsol Multiphysicsmentioning

confidence: 99%

“…To determine the optimal grid, a preliminary grid dependency test was carried out in Georgescu et al [6]. For all farm models, the meshes from Fig.…”

Section: Numerical Setup In Comsol Multiphysicsmentioning

confidence: 99%

See 2 more Smart Citations

Efficiency of Marine Hydropower Farms Consisting of MultipleVertical Axis Cross-Flow Turbines

Georgescu

Cosoiu

et al. 2011

International Journal of Fluid Machinery and Systems

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show abstract

“…The CFD method plays a more and more important role nowadays on hydrodynamic research due to the rapid development of computer technology. Georgescu et al [23] established a 2D numerical method with COMSOL Multiphysics and Fluent software (15.0, ANSYS Inc, Pittsburgh, PA, USA) to compute the overall farm efficiency [24]. Three different turbine configurations were performed in the simulation and the simulation results were compared with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Performance Analysis of the Vertical Axis Twin-Rotor Tidal Current Turbine

et al. 2018

Water

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The goal of this manuscript is to investigate the influence of relative distance between the twin rotors on the hydrodynamic performance of the vertical axis twin-rotor tidal current turbine. Computational fluid dynamics (CFD) simulations based on commercial software ANSYS-CFX have been performed to enhance the understanding of interactions between the twin-rotors. The interactions between the twin rotors are known to have increased the power output efficiency as a whole, and it is, therefore, of great significance to undertake deeper research. The simulation results are found to be consistent with similar research results in the literature in some aspects. The simulation results of stand-alone turbine and twin rotors are compared from three different aspects, including blade forces, power output efficiency and wake flow field. The results showed that the cyclic variations tendency of blade force coefficients of twin rotors is close to that of the stand-alone turbine. The average power output efficiency of the twin-rotors system is higher than that of the stand-alone turbine. The interactions between the turbines increase the power output of the twin turbine system as whole in a wide relative distance range. However, smaller relative distance between the twin rotors does not mean a bigger power output efficiency of such a system. The power out efficiency of such a system would decrease when the relative distance between the twin rotors exceeds the critical point. The power output of the twin rotors reaches the peak value when the ratio between the two main axis distance and diameter of the turbine is around 9/4. This research can provide a reference for the design and development of larger tidal power stations.

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Comprehensive Study on Tidal Energy & Vertical Axis Tidal Turbine-corrosion Prevention Solution

Khalid¹,

Sun²,

Zhang³

2011

Energy Procedia

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Velocity field in the wake of a hydropower farm equipped with Achard turbines

Cited by 8 publications

References 1 publication

Efficiency of Marine Hydropower Farms Consisting of MultipleVertical Axis Cross-Flow Turbines

Efficiency of Marine Hydropower Farms Consisting of MultipleVertical Axis Cross-Flow Turbines

Hydrodynamic Performance Analysis of the Vertical Axis Twin-Rotor Tidal Current Turbine

Comprehensive Study on Tidal Energy & Vertical Axis Tidal Turbine-corrosion Prevention Solution

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