Experiments on line arrays of horizontal-axis hydroturbines

Okulov, Valery; Naumov, I. V.; Kabardin, I. K.; Litvinov, Ivan V.; Маркович, Д. М.; Mikkelsen, Robert Flemming; Sørensen, Jens Nørkær; Алексеенко, С. В.; Wood, Daniel

doi:10.1016/j.renene.2020.08.148

Cited by 11 publications

(4 citation statements)

References 34 publications

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“…, but for the additional arrays, the downstream flow is represented by a reference station, which is simply indicated as "ref ". The array thrust coefficient C TA,ref , i.e., the ratio of the resultant thrust force generated over the entire structure to the reference dynamic pressure force (5), is used to solve the degree of momentum conservation between upstream and downstream stations {0, ref }, whose equation is given in (6).…”

Section: Iterative Scheme For a Single-arraymentioning

confidence: 99%

“…Okulov et al [6] tested longitudinally aligned horizontal axis hydrokinetic turbines with particle image velocimetry to measure the flow properties upstream and downstream of the devices including up to four elements, highlighting the interference of the turbine wake on the downstream turbine, which was closely deployed. The authors remarked on a continuous drop in turbine performance due to the upstream wake reducing the inflow speed with higher turbulence.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Array Design for Hydrokinetic Turbines in Hydropower Canals

2023

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The design of hydrokinetic plants in hydropower canals involves the choice of the array layout, rotor geometry, turbine spacing, and array spacing, and necessitates the control of the resultant backwater to avoid upstream flooding hazards. Several works in the literature have shown that array power optimization is feasible with small spacings between the arrays, disregarding the limitation in the power output induced by backwater upstream. In this study, a 1-D channel model with a Double Multiple Streamtube code and wake sub-models are integrated to predict an array layout that will maximize the array power. The outputs of the conducted sensitivity analysis confirm that this design enabled improved power conversion with closely spaced turbines and largely spaced arrays, thus allowing for a partial recovery of the total head variation for a new array deployed upstream. In addition to the quantitative assessment of the mechanical power converted, the tool enables depth control from the downstream undisturbed flow station to the backwater exhaustion far upstream, thereby increasing its flexibility. Furthermore, it overcomes the limitations of actuator disc models by considering rotor’s fluid dynamic losses. The results show that power output linearly scales for a limited number of arrays (≤5), whilst the variation in water depth variation follows a power law from the most downstream array towards upstream, regardless of the plant size. Finally, the maximum upstream inflow depth is demonstrated to become asymptotic for large multi-array plants under ideal conditions.

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Section: Iterative Scheme For a Single-arraymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-Array Design for Hydrokinetic Turbines in Hydropower Canals

2023

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“…One alternative that can be applied in the use of hydro energy is to implement hydrokinetic power plants. Without massive use of dams and civil infrastructure, hydrokinetic power plants can generate energy only by utilizing the kinetic energy of flowing water [10]. The technology is not only can be applied to river flows, but also to ocean currents [11].…”

Section: Introductionmentioning

confidence: 99%

Power Control Study of Hydrokinetic Power Plants in presence of Wake Effect

Ikhsan,

Fachri

2023

CRC

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Hydrokinetic power plants are able to produce energy only by harnessing the kinetic energy of flowing water. Compared to dam-based hydroelectric power plants, hydrokinetic power plants have minimal impact on several issues e.g. environmental, health, social and political conflict. Similar to wind turbines in a wind farms, hydrokinetic turbines in tidal farms also generate a wake effect, which results in less kinetic energy on downstream turbines compared to upstream turbines. This article shows the simulation results of three hydrokinetic power generation systems installed in series on the same water stream such as river or aqueduct. The upstream turbine generates wake effect and resulting a velocity deficit both in the two downstream turbines. Bastankhah Porté-Agel model for wake effect was used in this study. The simulation results show that the downstream turbine cannot maintain the given voltage reference and loses the stability of the power control if the water velocity decreases. Several recommendations regarding series configuration of the hydrokinetic system are also presented in order to support the control stability.

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“…The latter, in turn, is divided into single point methods, first of all optical ones (e.g., LDA -laser Doppler anemometer [4][5][6][7]) and various modifications of the so called "field methods" [8-14in particular based on stroboscopic tracer visualization of flows. The latter allows obtaining of the instantaneous flow pattern what is of principal importance for the visualization and diagnostics of non-stationary turbulent flows [15][16][17] or that ones, containing large-scale vortex structures [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Processing of Visual Experimental PIV-Data Using a Random Synthetic Particle Generator

Mochalov¹,

Varaksin²

2021

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The study of free non-stationary vortex structures by the PIV method requires the search for the most rational approach to visual data processing. The paper evaluates the qualitative and quantitative characteristics of the velocity fields based on the generator of random synthetic particles. The simplified case of a solid-state rotation with a given velocity is considered as the closest to the vortex motion.

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Experiments on line arrays of horizontal-axis hydroturbines

Cited by 11 publications

References 34 publications

Multi-Array Design for Hydrokinetic Turbines in Hydropower Canals

Multi-Array Design for Hydrokinetic Turbines in Hydropower Canals

Power Control Study of Hydrokinetic Power Plants in presence of Wake Effect

Processing of Visual Experimental PIV-Data Using a Random Synthetic Particle Generator

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