Numerical Study of Wake Characteristics in a Horizontal-Axis Hydrokinetic Turbine

Silva, Paulo Augusto Strobel de Freitas e; Oliveira, Taygoara Felamingo de; Brasil, Antônio; Vaz, Jerson Rogério Pinheiro

doi:10.1590/0001-3765201620150652

Cited by 26 publications

(18 citation statements)

References 23 publications

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“…For this reason, an SST turbulence model is adopted in the design of this vertical axis hydrokinetic turbine proposed here in the same way used by other authors [22,[61][62][63][64][65].…”

Section: Vertical Axis Hydrokinetic Turbine Hydrodynamic Modelsmentioning

confidence: 99%

Computational Fluid Dynamic Simulation of Vertical Axis Hydrokinetic Turbines

Chica¹,

Rubio-Clemente²

2020

Computational Fluid Dynamics Simulations

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Hydrokinetic turbines are one of the technological alternatives to generate and supply electricity for rural communities isolated from the national electrical grid with almost zero emission. These technologies may appear suitable to convert kinetic energy of canal, river, tidal, or ocean water currents into electricity. Nevertheless, they are in an early stage of development; therefore, studying the hydrokinetic system is an active topic of academic research. In order to improve their efficiencies and understand their performance, several works focusing on both experimental and numerical studies have been reported. For the particular case of flow behavior simulation of hydrokinetic turbines with complex geometries, the use of computational fluids dynamics (CFD) nowadays is still suffering from a high computational cost and time; thus, in the first instance, the analysis of the problem is required for defining the computational domain, the mesh characteristics, and the model of turbulence to be used. In this chapter, CFD analysis of a H-Darrieus vertical axis hydrokinetic turbines is carried out for a rated power output of 0.5 kW at a designed water speed of 1.5 m=s, a tip speed ratio of 1.75, a chord length of 0.33 m, a swept area of 0.636 m 2 , 3 blades, and NACA 0025 hydrofoil profile.

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“…For this reason, an SST turbulence model is adopted in the design of this vertical axis hydrokinetic turbine proposed here in the same way used by other authors [22,[61][62][63][64][65].…”

Section: Vertical Axis Hydrokinetic Turbine Hydrodynamic Modelsmentioning

confidence: 99%

Computational Fluid Dynamic Simulation of Vertical Axis Hydrokinetic Turbines

Chica¹,

Rubio-Clemente²

2020

Computational Fluid Dynamics Simulations

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“…For the optimization of the multi-element profile, V rel and C were taken as the parameters for executing 2D CFD simulations using Ansys Fluent software [47] with the k-ω SST turbulence model. This turbulence model is commonly used for hydrokinetic turbine modelling [48][49][50][51][52][53][54] because the referred model has demonstrated higher performance for complex flows, including adverse pressure gradients and flow separations, as occurs in horizontal-axis hydrokinetic turbines. The k-ω SST turbulence model offers an improved prediction of adverse pressure gradients in the near wall regions when compared to the standard k-ω and k-ε models [48].…”

Section: Multi-element Hydrofoil Optimization Frameworkmentioning

confidence: 99%

Design and Optimization of a Multi-Element Hydrofoil for a Horizontal-Axis Hydrokinetic Turbine

et al. 2019

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Hydrokinetic turbines are devices that harness the power from moving water of rivers, canals, and artificial currents without the construction of a dam. The design optimization of the rotor is the most important stage to maximize the power production. The rotor is designed to convert the kinetic energy of the water current into mechanical rotation energy, which is subsequently converted into electrical energy by an electric generator. The rotor blades are critical components that have a large impact on the performance of the turbine. These elements are designed from traditional hydrodynamic profiles (hydrofoils), to directly interact with the water current. Operational effectiveness of the hydrokinetic turbines depends on their performance, which is measured by using the ratio between the lift coefficient (CL) and the drag coefficient (CD) of the selected hydrofoil. High lift forces at low flow rates are required in the design of the blades; therefore, the use of multi-element hydrofoils is commonly regarded as an adequate solution to achieve this goal. In this study, 2D CFD simulations and multi-objective optimization methodology based on surrogate modelling were conducted to design an appropriate multi-element hydrofoil to be used in a horizontal-axis hydrokinetic turbine. The Eppler 420 hydrofoil was utilized for the design of the multi-element hydrofoil composed of a main element and a flap. The multi-element design selected as the optimal one had a gap of 2.825% of the chord length (C1), an overlap of 8.52 %C1, a flap deflection angle (δ) of 19.765°, a flap chord length (C2) of 42.471 %C1, and an angle of attack (α) of –4°.

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“…In that respect, different models have been developed for various configurations, such as in free flow, operation with nozzle, and the study of turbine wake features in an environment. Silva et al [7] notably underline the specific case of studies in rivers where the depth and width of waterways are constraining parameters to consider. It can be noticed that a minority part of papers considers mechanical converters other than turbine, such as oscillating or vibrating converters.…”

Section: Academic Interest On River and Estuarine Domainmentioning

confidence: 99%

River and Estuary Current Power Overview

Flambard

Feld

Benbouzid

et al. 2019

JMSE

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This paper presents a review of the stream current power sector, with a distinction made between the marine (MCP) and the river/estuary current power (RECP). Although scientific literature about MCP is actually well defined, that about RECP seems small, though this domain has some research interest. This paper has thus a special emphasis on this latter, with comparative studies done between these domains. The assessment of the academic and industrial interests for the RECP is first addressed, based on two main scientific resources and a qualitative highlight of its potential. Then, a review of actual constraints restricting its development is introduced, followed by a non-exhaustive presentation of industrial projects. Finally, some development prospects allowing constraints to be mitigated are proposed. Globally, MCP and RECP are treated unconcernedly, with a primary interest on the mechanical converter study and the location energy potential estimation. It has been highlighted that countries with RECP potential are more plentiful, and that undertaken projects can be classified mainly into two categories following the nominal power of the production unit. Furthermore, the river current power growth has been confirmed in recent years, with a majority part of patented hydrokinetic technologies, although commercial deployments are still scarce.

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Numerical Study of Wake Characteristics in a Horizontal-Axis Hydrokinetic Turbine

Cited by 26 publications

References 23 publications

Computational Fluid Dynamic Simulation of Vertical Axis Hydrokinetic Turbines

Computational Fluid Dynamic Simulation of Vertical Axis Hydrokinetic Turbines

Design and Optimization of a Multi-Element Hydrofoil for a Horizontal-Axis Hydrokinetic Turbine

River and Estuary Current Power Overview

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