Prospective of development of large-scale tidal current turbine array: An example numerical investigation of Zhejiang, China

Deng, Guizhong; Zhang, Zhaoru; Li, Ye; Liu, Hailong; Xu, Wentao; Pan, Yulin

doi:10.1016/j.apenergy.2020.114621

Cited by 30 publications

(11 citation statements)

References 77 publications

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“…It is founded that the installation of turbines not only slowed down tidal currents but also affected a certain area near the TCP extraction site. The results of a study of large-scale tidal current power array and ocean response, presented in [16], show that currents are decelerated significantly downstream of the array.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

Barbarić

Guzović

2020

Energies

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Horizontal axis turbines are commonly used for harnessing renewable hydrokinetic energy, contained in marine and river currents. In order to encourage the expansion of electricity generation using micro-hydrokinetic turbines, several design improvements are investigated. Firstly, optimization-based design of rotor blade is used to get as close as possible to the efficiency limit of 59.3% (known as Betz limit), that counts for bare turbine rotors, placed in the free flow. Additional diffuser elements are further added to examine the potential to overcome the theoretical efficiency limit by accelerating water at the axial direction. Various diffuser geometrical configurations are investigated using the computational fluid dynamics (CFD) to obtain insight into hydrodynamics of augmented micro-hydrokinetic turbines. Moreover, the turbines are compared from the energy conversion efficiency point of view. The highest maximum power coefficient increase of 81% is obtained with brimmed (flanged) diffuser. Diffusers with foil-shaped cross-sections have also been analyzed but power augmentation is not significantly greater than in the case of simple cross-section designs of the same dimensions. The power coefficients’ comparison indicate that considerable power augmentation is achievable using brimmed diffuser with higher value of length-to-diameter ratio. However, the impact of diffuser length increase on the power coefficient enhancement becomes weaker as the length-to-diameter ratio reaches a value of 1.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

Barbarić

Guzović

2020

Energies

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“…The development of transportation in coastal areas is greatly influenced by geomorphological factors (Oliveira et al, 2020). Tidal energy could potentially slow down the sediment transport rate (Deng et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

The Geomorphological Factors and Its Implications for The Tidal Energy Installations in Java, Indonesia

Kurnianto¹,

Ikhsan²,

Apriyanto³

et al. 2021

J. Geoscience Eng. Environ. Technol.

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This study aims to place the tidal energy installation effectively in Indonesia based on geomorphological factors. The survey method was used to analyze the characteristics of beaches in Indonesia. Mathematical physics model was implemented to find the new formulas based on geomorphological factors. Tides are the result of gravitational attraction and the centrifugal effect, which is the drive In the earth-moon system, tidal generating forces are the resultant forces that cause tides, namely: the earth-moon system (FS) centrifugal force and the moon's gravitational force (FB). FS works in the center of the mass of the earth-moon system whose mass point is located on the 3/4 radius of the earth. The style of tidal generator caused by the moon can be calculated by combining Newton's universal gravitational law .The results of this study consist of F = m ac, where the style of the tidal generator caused by the moon can be calculated by combining newton's universal gravitational law in equation and newton's second law of motion in Equation. The another results is tan = , where the formula takes into account constants (K) based on slopes. The last result is the constants (K) for each land form starting on 0,00 untill 1,00. The north coast of Java is more suitable for tidal energy installations because the land form is dominated by alluvium plains of the quaternary age with a lower risk than the southern region of Java. The effectiveness of tidal energy installation depends on the characteristics of the land form. In alluvial plains, the quaternary age of the alluvial plains is more suitable than the hill form volcanic quaternary, tertiary volcanic, and tertiary holokarst.

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“…Tidal turbines are represented in MIKE21/3 as a sub-grid object with their influence on the hydrodynamics based on actuator disc theory. The turbines are modelled as a momentum sink terms which are related to the thrust exerted by the turbine, method commonly applied for the study of tidal farm energy extraction [28,29,30,31,32,33]. For each mesh layer the influence of turbines is modelled by calculating the current induced drag and lift force on each layer [25].…”

Section: General Descriptionmentioning

confidence: 99%

Variability of sediment processes around a tidal farm in a theoretical channel

et al. 2021

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Sediment transport plays a crucial role in coastal ecosystems and is one of the least known parameters in high energy sites. The recent development of tidal energy projects challenges the scientific community to better understand this natural phenomenon and the interactions with tidal turbines. Using MIKE21/3 software from DHI, a benchmark for sediment transport model was developed with simulations with and without a tidal farm in idealised two and three-dimensional tidal channels. Results reveal that a 2D approach is sufficient for regional scale morphological assessments, however 3D models allow for a closer examination of influences around the tidal farm. Differences in calculating sediment transport rates based on approaches after Engelund & Fredsøe and Van Rijn formulae illustrate the degree of uncertainty in modelling sediment transport rates. Results for the Engelund & Fredsøe models also show that they are sensitive to mesh resolution in equilibrium conditions and are more stable in non-equilibrium conditions for the bed level change rates. Tests have also demonstrated that models using Engelund & Fredsøe formulae are more sensitive to physical characteristics than models based on Van Rijn, accentuating the necessity to evaluate sediment transport formulae with field data before making a choice of model.

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Prospective of development of large-scale tidal current turbine array: An example numerical investigation of Zhejiang, China

Cited by 30 publications

References 77 publications

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

Investigation of the Possibilities to Improve Hydrodynamic Performances of Micro-Hydrokinetic Turbines

The Geomorphological Factors and Its Implications for The Tidal Energy Installations in Java, Indonesia

Variability of sediment processes around a tidal farm in a theoretical channel

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