Investigation of Submergence Depth and Wave-Induced Effects on the Performance of a Fully Passive Energy Harvesting Flapping Foil Operating Beneath the Free Surface

Petikidis, Nikos; Papadakis, George

doi:10.3390/jmse11081559

Cited by 4 publications

(2 citation statements)

References 46 publications

(63 reference statements)

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“…Incorporating a Gurney flap was found to increase vortex formation at the rear edge and amplify the pressure differential along the foil, boosting heaving force and resulting in 21% improvements in energyharvesting efficiency [42,43]. The exploration of fully passive flapping foils in free surface flow aimed to identify optimal submergence depths and the effects of monochromatic waves [44]. A responsive control mechanism has been designed to adjust the attack angle, with the goal of increasing lift force and improving overall power output [45].…”

Section: Introductionmentioning

confidence: 99%

Numerically Investigating the Energy-Harvesting Performance of an Oscillating Flat Plate with Leading and Trailing Flaps

Saleh,

Sohn

2024

Energies

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This study investigates the power generation capability of an oscillating wing energy harvester equipped with two actively controlled flaps positioned at the leading and trailing flaps of the wing. Various parameters, including flap lengths and pitch angles for the leading flap and trailing flap, are explored through numerical simulations. The length of the main wing body ranges from 40% to 65% of the chord length, c, while the leading and trailing flaps vary accordingly, summing up to the total length of the flat plate c = 100%. The pitch angles of the two flaps are adjusted within predefined limits. The pitch angle for the leading flap varies between 25° and 55°, while the trailing flap’s angle ranges from 10° to 40° across 298 different simulation scenarios. The results indicate that employing both leading and trailing flaps enhances the power output compared to a wing with a single flap configuration. The trailing flap deflects the incoming fluid more vertically, while the leading flap increases pressure difference across the surface of the main wing body, synergistically improving overall performance. The power output occurs at a specific length percentage: a leading flap of 30%, a main wing body of 50%, and a trailing flap of 20%, with pitch angles of 50°, 85°, and 30°, respectively, increasing the output power increments by 4.39% compared to a wing with a leading flap, 4.92% compared to a wing with a trailing flap, and 28.24% compared to a single flat plate. The highest efficiency for the specified length percentages is 40.37%.

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Section: Introductionmentioning

confidence: 99%

Numerically Investigating the Energy-Harvesting Performance of an Oscillating Flat Plate with Leading and Trailing Flaps

Saleh,

Sohn

2024

Energies

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“…They [21] proposed a tandem-hydrofoil-based tidal array with improved density and reduced costs. Petikidis and Papadakis [22] studied fully passive flapping foils in free surface flow, determining optimal submergence depths and assessing the influence of monochromatic waves. Dahmani and Sohn [23] introduced a novel approach using oscillating tandem wings inside a convergent duct to enhance power extraction in energy harvesting.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Performance of an Oscillating Wing Energy Harvester Using a Leading-Edge Flap

Alam,

Sohn

2023

JMSE

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In this study, we investigated the power generation capability of an oscillating wing energy harvester featuring an actively controlled flap positioned at the wing’s leading edge. The findings revealed that attaching a leading-edge flap reduces fluid flow separation below the wing’s lower surface at the leading edge, resulting in smoother flow and increased velocity near the hinge region. The leading-edge flap increases the pressure difference across the wing’s surface, thereby enhancing the overall performance. In addition, the introduction of the leading-edge flap effectively elongates the wing’s effective projected length in the heaving direction, leading to increased thrust. We examined flap lengths ranging from 10% to 50% of the chord length, with the maximum pitch angles of the wing and flap varying from 75° to 105° and 30° to 55°, respectively. The optimal power generation was achieved using a flap length of 40% of the chord length, combined with maximum wing and flap pitch angles of 95° and 45°, respectively. These conditions yielded a 29.9% overall power output increase and a 20.2% efficiency improvement compared to the case without the leading-edge flap.

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The propulsion performance of the semi-active tandem flapping foils for wave gliders: A study on vortex interactions and hydrodynamic performance

Qi,

Xing,

Qiao

et al. 2024

Ocean Engineering

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Investigation of Submergence Depth and Wave-Induced Effects on the Performance of a Fully Passive Energy Harvesting Flapping Foil Operating Beneath the Free Surface

Cited by 4 publications

References 46 publications

Numerically Investigating the Energy-Harvesting Performance of an Oscillating Flat Plate with Leading and Trailing Flaps

Numerically Investigating the Energy-Harvesting Performance of an Oscillating Flat Plate with Leading and Trailing Flaps

Enhancing the Performance of an Oscillating Wing Energy Harvester Using a Leading-Edge Flap

The propulsion performance of the semi-active tandem flapping foils for wave gliders: A study on vortex interactions and hydrodynamic performance

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