Numerical Study for a Marine Current Turbine Blade Performance under Varying Angle of Attack

Dajani, S. Jayyousi; Shehadeh, Mohamed; Saqr, Khalid M.; Elbatran, A. H.; Hart, Neil; Soliman, Abdel-Hamid; Cheshire, David

doi:10.1016/j.egypro.2017.07.143

Cited by 7 publications

(6 citation statements)

References 15 publications

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“…This research simulates the turbine with variations of Tip Speed Ratio (TSR) and the angle of attack of the hydrofoil. Details of the variations of the geometry that determined to find the most optimum geometry [13] [14], as explained in Table 1. Table 1, the variations of velocity speed of the flow were put, while the rotational speed and the radius of the turbine remaining constant.…”

Section: Methods Geometry Modeling and Meshingmentioning

confidence: 99%

“…Meshing or grinding is a discretization of the continuous fluid domain into discrete computation so the CFD numerical solution can be done using the ANSYS FLUENT software to obtain the solutions such as speed, pressure, fluid contour, and other solutions for each of the discrete domain [14,15,16]. Figure 2 shows the visualization of the meshing result.…”

Section: Methods Geometry Modeling and Meshingmentioning

confidence: 99%

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Design Modeling of Savonius-Darrieus Turbine for Sea Current Electric Power Plant

Metheny

Permatasari

Annas

2020

Sinergi

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Turbines convert the kinetic energy of ocean currents into electrical energy produced by the sea current electric power plant. This study aims to design a power generator turbine modeling that is carried out using the Computational Fluid Dynamic (CFD) approach by comparing the geometric performance based on the angle of attack and the Tip Speed Ratio (TSR) value of the Savonius-Darrieus Turbine. Having done several trials and errors during collecting the data, the value of the TSR 1.427; 2.853; 4.28; 5; and 5.7 is proposed. Here, the NACA 0018 series has been adopted on the current design of Savonius-Darrieus Turbine. The turbine has three blades, length of the span 357 mm, the diameter of turbine 428 mm, and length of the hydrofoil chord 40 mm. Effect of various angle of attacks from 0°up to 10° has been taken into account in the computational to obtain the coefficient power for each variation. The results revealed that the turbine with an angle of attack of 5°and TSR value of 5.0 has higher power coefficient value by 0.469 as compared with its angle of attack of 10°. It should be noted here that the increase of the angle of attack up to 10° resulted in a significant reduction of the power coefficient value of 0.206 as the value of TSR about 4.28. The addition of the Savonius Rotor results in increasing efficiency of the turbine for sea current applications.

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Section: Methods Geometry Modeling and Meshingmentioning

confidence: 99%

Section: Methods Geometry Modeling and Meshingmentioning

confidence: 99%

Design Modeling of Savonius-Darrieus Turbine for Sea Current Electric Power Plant

Metheny

Permatasari

Annas

2020

Sinergi

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“…The measurements of the gap and overlap were provided in terms of a percentage of the chord length of the main element (gap = % C 1 , overlap = % C 1 ). The third parameter of the definition of the gap-overlap is the "deflection angle" (δ), which is defined as the angle between the main element and the flap chord; δ a positive value when the rotation flap is mobilized in a clockwise direction [29][30][31][32][33][34]42]. In addition to the mentioned variables, the flap chord length (C 2 ) was considered as a variable, which was given as a percentage of the main element chord (C 2 = % C 1 ), like the gap and the overlap.…”

Section: Description Of the Optimization Problemmentioning

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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“…For the profiles of the hydrokinetic turbine blades, small α are usually chosen where the lift coefficient is high and the drag coefficient is low [21]- [25]. These coefficients depend on the water velocity and, hence, on the Reynolds number, because when the viscosity forces are greater compared to the inertial forces, the effects of the friction are increased, affecting the velocities, the pressure gradient and the lift generated by the hydrodynamic profile [1]- [3], [27]- [28]. Therefore, for the design of the blade of the hydrokinetic turbine, the profiles studied were selected to have a large lift-to-drag ratio.…”

Section: D Javafoil Analysismentioning

confidence: 99%

“…Flow field around Eppler 420 hydrofoil with and without flap and the lift and drag coefficients were calculated by using CFD simulation. The steady-state governing the equations of continuity and momentum conservation were solved combined with the ݇ − ߱ shear-stress transport (SST) turbulence model using the ANSYs-Fluent code [27], [28]. Three case studies were simulated (Figure 4).…”

Section: D Cfd Modeling and Simulationmentioning

confidence: 99%

Analysis of a lift augmented hydrofoil for hydrokinetic turbines

Chica¹,

Aguilar²,

Rubio-Clemente³

2019

REPQJ

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In the last years, increased attention has been given to hydrokinetic energy technologies due to these turbines represent an attractive technology for the harnessing of a huge untapped renewable energy potential in oceans, seas but also in rivers and canals. However, the low efficiency is an important barrier to its commercialization. The aim of this study is to present the selection of a multi-element hydrofoil that can enhance the hydrokinetic turbine performance. Therefore, in order to examine the influence of the type of airfoil used, as multi-element hydrofoil, on the blade performance, several studies using JavaFoil software were performed. The result indicates that hydrofoil multi-element Eppler 420 can provide high efficiency of the turbine because it has a higher relationship between the lift and drag coefficients C Lmax /C D (47.77) compared to the Selig S1223 profile (39.59) and other hydrofoils studied. Furthermore, computational fluid dynamics (CFD) was used to obtain the hydrodynamic characteristics of the hydrofoil Eppler 420 with and without flap. The CFD simulations were carried out using ANSYs-Fluent software. It was observed that there is an increase in the lift coefficient by 69.46% and 471.39 % for the hydrofoil with flap and a chord length of 30%, and a chord length of 70%, respectively, under the analyzed conditions with respect to the hydrofoil without flap.

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Numerical Study for a Marine Current Turbine Blade Performance under Varying Angle of Attack

Cited by 7 publications

References 15 publications

Design Modeling of Savonius-Darrieus Turbine for Sea Current Electric Power Plant

Design Modeling of Savonius-Darrieus Turbine for Sea Current Electric Power Plant

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

Analysis of a lift augmented hydrofoil for hydrokinetic turbines

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