A novel flexible foil vertical axis turbine for river, ocean, and tidal applications

Zeiner-Gundersen, Dag Herman

doi:10.1016/j.apenergy.2015.04.005

Cited by 63 publications

(28 citation statements)

References 31 publications

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“…Compared with theoretical calculations, CFD analysis can better capture the detail information of local features and provide visual analysis of the flow field [20,21], providing a more specific optimization solution for the subsequent improvement of the converter. Furthermore, CFD analysis can significantly reduce the high costs of high frequency modifications or mass production of prototype in pilot studies [22,23]. Relevant experiments were conducted to verify the accuracy of the numerical analysis method.…”

Section: Design Objective and Conceptmentioning

confidence: 99%

Design and Numerical Analysis of a Novel Counter-Rotating Self-Adaptable Wave Energy Converter Based on CFD Technology

et al. 2018

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Abstract:The lack of an efficient and reliable power supply is currently one of the bottlenecks restricting the practical application of unmanned ocean detectors. Wave energy is the most widely distributed ocean energy, with the obvious advantages of high energy density and predictability. In this paper, a novel wave energy converter (WEC) for power supply of low-power unmanned ocean detectors is proposed, which is a small-scale counter-rotating self-adaptive point absorber-type WEC. The double-layer counter-rotating absorbers can achieve the torque balance of the whole device. Besides, the self-adaptation of the blade to the water flow can maintain a unidirectional continuous rotation of the single-layer absorber. The WEC has several advantages, including small occupied space, simple exchange process and convenient modular integration. It is expected to meet the power demand of low-power ocean detectors. Through modeling and CFD analysis, it was found that the power and efficiency characteristics of WEC are greatly influenced by the relative flow velocity, the blade angle of the absorber and the interaction between the upper and lower absorbers. A physical prototype of the WEC was made and some related experiments were conducted to verify the feasibility of WEC working principle and the reliability of CFD analysis.

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Section: Design Objective and Conceptmentioning

confidence: 99%

Design and Numerical Analysis of a Novel Counter-Rotating Self-Adaptable Wave Energy Converter Based on CFD Technology

et al. 2018

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“…The design of the high solidity (0.952) flexible foil vertical axis turbine (5 m tall, 9 m diameter, five wings) has been previously described in detail [24]. Each of the five turbine wings had a blade set consisting of two panels (each 0.85 m wide Â 2.5 m high) mounted one above the other and connected to three arms.…”

Section: Flexible Blade Design and Passive Pitching Mechanismmentioning

confidence: 99%

“…Fig. 6 shows the azimuth position versus calculated dynamic angle of attack plotted versus the turbine's tip speed ratios [24]. Each of the five blades was subject to the dynamic kinematic motion of such blade movements as they rotated around the center axis and were exposed to different relative flow angles of attack versus azimuth angles.…”

Section: Calculation Of the Turbine Functionality Blade Flopping Frementioning

confidence: 99%

“…By allowing the blades to adjust their angle of attack relative to the external flow gradients, a higher average rotational efficiency and more stable rotation with less force/stress peaks was achieved than observed with a three-winged pilot turbine tested at the same site. Blade adjustment was based on the net rotational moment from lift and drag that maintained a relatively high coefficient of power and stable rotation with few force/stress peaks, as well as the predesigned profile flopping action during the rotation [24].…”

Section: Calculation Of the Turbine Functionality Blade Flopping Frementioning

confidence: 99%

“…Thus, such morphing blades can handle higher relative angles of attack and better adapt to local flow conditions compared to fixed blades, thereby also increasing overall efficiency. On site tests of a full-scale flexible foil turbine at the Sarpefossen power station (Glomma river at Sarpefossen, Norway) had high turbine efficiency over a range of inflow water speeds: 37% (0.79 m/s), 25% (1.18 m/s), and 20% (1.55 m/s) [24].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A vertical axis hydrodynamic turbine with flexible foils, passive pitching, and low tip speed ratio achieves near constant RPM

Zeiner-Gundersen¹

2014

Energy

Self Cite

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Darrieus vertical-axis water turbines: deformation and force measurements on bioinspired highly flexible blade profiles

et al. 2020

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The characteristics of the fluid-structure interaction on the flexible blades of a horizontal-axis water turbine are studied; this bioinspired technology features mechanical simplicity, performance and lifetime improvement, and low fish impact risk, all characteristics of a truly sustainable renewable energy exploitation. A surface-tracking method synchronized with force measurements was applied on a surrogate model of single-bladed, vertical-axis water turbine in a water channel. This allows for the characterization of the structural deformations and their link to the hydrodynamic forces, over a large range of turbine designs and operating points. It is shown that the phase angles of the maxima in blade deformation coincide with those of the load maxima on a rigid blade in identical flow conditions. The influence of the turbine's tip/speed ratio on the blade deformation and blade load is investigated. With the chosen blade design, hydrofoil deformation is found to be maximum in the operating points where the performance improvement is maximized (k o = 0.3). With lower values of reduced frequency (corresponding to lower rotation speed), fluid-induced forces dominate the fluid-structure interaction. Conversely, at higher frequencies, structural inertia dominates the interaction, and blade deformation is again reduced. Results suggest that the optimal blade rigidity may depend on the operating point; nevertheless the potential of the flexible-blade design is demonstrated through clear linking of fluid-induced forces and blade deformation in the complex flow conditions of the Darrieus water turbine.

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A novel flexible foil vertical axis turbine for river, ocean, and tidal applications

Cited by 63 publications

References 31 publications

Design and Numerical Analysis of a Novel Counter-Rotating Self-Adaptable Wave Energy Converter Based on CFD Technology

Design and Numerical Analysis of a Novel Counter-Rotating Self-Adaptable Wave Energy Converter Based on CFD Technology

A vertical axis hydrodynamic turbine with flexible foils, passive pitching, and low tip speed ratio achieves near constant RPM

Darrieus vertical-axis water turbines: deformation and force measurements on bioinspired highly flexible blade profiles

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