A design tool and fabrication guidelines for small low cost horizontal axis hydrokinetic turbines

Muñoz, Arturo; Chiang, Luciano E.; Jara, Esteban

doi:10.1016/j.esd.2014.05.003

Cited by 23 publications

(16 citation statements)

References 3 publications

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“…Torque and angular velocity of the rotor are achieved by hydrofoil lift and drag forces. These forces depend on the change of pressures generated in the hydrofoil surfaces, which in turn depend on the fluid density and the hydrofoil shape profile, angle of attack and section pitch angle [2,[5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…When determining the angle of attack needed to obtain the lift coefficient, the right choice is to maximize the lift to drag ratio. Obtaining as much lift as possible and as little drag as possible is preferred, since lift force is converted into usable power and drag force creates losses and reduces the efficiency of the machine [1,3,5,9,10].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigations and CFD Simulations of the Blade Section Pitch Angle Effect on the Performance of a Horizontal-Axis Hydrokinetic Turbine

Chica

Cardona-Mancilla

Slayton

et al. 2018

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Three twisted blades of a 1 kW prototype hydrokinetic turbine were designed based on the Blade Element Momentum (BEM) theory with a tip speed ratio of 6.25; a water velocity of 1.5 m/s; an angle of attack and pitch angle of 5 and 0 • , respectively; a power coefficient of 0.4382 and a drive train efficiency of 70%. S822 hydrofoil was used to generate the coordinates of the blade cross-section. Experimental investigations and Computational Fluid Dynamics (CFD) simulations were carried out to estimate the performance of the blade design and know the effect of the section pitch angle on the performance of a horizontal-axis hydrokinetic turbine. The obtained results showed that the increase in the section pitch angle enhanced the performance up to a certain value. Further increase in the section pitch angle resulted in a low performance and a reduction of the rotation velocity, which in turn requires a high gearing ratio of the transmission system.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigations and CFD Simulations of the Blade Section Pitch Angle Effect on the Performance of a Horizontal-Axis Hydrokinetic Turbine

Chica

Cardona-Mancilla

Slayton

et al. 2018

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“…It is highlighted that λ is the ratio between the speed of the blade at its tip and the speed of the water current. This ratio has a strong influence on the efficiency of the turbine [4,5,8,10]. This variable may be defined as Eq.…”

Section: Renewable Hydropower Technologiesmentioning

confidence: 99%

Design of Zero Head Turbines for Power Generation

Chica¹,

Rubio-Clemente²

2017

Renewable Hydropower Technologies

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Failure analysis of the blades of a horizontal axis hydrokinetic turbine of 1 kW is presented. Analysis consisted of the determination of the pressure on the blade surface using Computational Fluid Dynamics, and the calculation of the stress distribution in the blade due to hydrodynamic, inertial and gravitational loads using the finite element methods. The results indicate that the blade undergoes significant vibration and deflection during the operation, and the centrifugal and hydrodynamic loads considerably affect the structural response of the blade; however, the stresses produced in all of the analysed models did not exceed the safe working stresses of the materials used to manufacture the blade. Modal analysis was conducted to calculate first significant natural frequencies. Results were studied in depth against operating frequency of the turbine. After carrying out the modal analysis, harmonic analysis was also done to see the response of the turbine under dynamic loading. It was observed that the turbine is safe in its entire operating range as far as phenomenon of resonance is concerned. Additionally, it was observed that maximum harmonic response of the turbine on the application of dynamic loading is far lesser than its failure limit within the specified operating range.

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“…The experimental results are compared with turbine performance predictions from Oceanflow Energy using WT_Perf, a blade element momentum theory (BEMT) code (Buhl Jr., 2004). WT_Perf was developed by the National Renewable Energy Laboratory (NREL) to predict the performance characteristics of a turbine (Chehouri et al, 2015;Lee et al, 2012;Muñoz et al, 2014). The WT_Perf results presented in Figure 10 are based on a 1 m/s inflow velocity and it is assumed that the turbine is operating in an undisturbed flow (i.e.…”

Section: Model Performance For Varying Inflow Speedsmentioning

confidence: 99%

A large scale model experimental study of a tidal turbine in uniform steady flow

2015

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An experimental study measuring the performance and wake characteristics of a 1:10 th scale horizontal axis turbine in steady uniform flow conditions is presented in this paper.Large scale towing tests conducted in a lake were devised to model the performance of the tidal turbine and measure the wake produced. As a simplification of the marine environment, towing the turbine in a lake provides approximately steady, uniform inflow conditions. A 16m long x 6m wide catamaran was constructed for the test programme. This doubled as a towing rig and flow measurement platform, providing a fixed frame of reference for measurements in the wake of a horizontal axis tidal turbine. Velocity mapping was conducted using Acoustic Doppler Velocimeters.The results indicate varying the inflow speed yielded little difference in the efficiency of the turbine or the wake velocity deficit characteristics provided the same tip speed ratio is used. Increasing the inflow velocity from 0.9 m/s to 1.2 m/s influenced the turbulent wake characteristics more markedly. The results also demonstrate that the flow field in the wake of a horizontal axis tidal turbine is strongly affected by the turbine support structure.

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A design tool and fabrication guidelines for small low cost horizontal axis hydrokinetic turbines

Cited by 23 publications

References 3 publications

Experimental Investigations and CFD Simulations of the Blade Section Pitch Angle Effect on the Performance of a Horizontal-Axis Hydrokinetic Turbine

Experimental Investigations and CFD Simulations of the Blade Section Pitch Angle Effect on the Performance of a Horizontal-Axis Hydrokinetic Turbine

Design of Zero Head Turbines for Power Generation

A large scale model experimental study of a tidal turbine in uniform steady flow

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