The oscillating hydrofoil represents a promising technology for harvesting energy from tidal currents.While previous research has primarily focused on oscillating hydrofoils utilizing a fully activated control strateg...The oscillating hydrofoil represents a promising technology for harvesting energy from tidal currents.While previous research has primarily focused on oscillating hydrofoils utilizing a fully activated control strategy,the industry predominantly employs a semi-activated control strategy in existing tidal current energy converters.It is essential to identify the differences in predicted energy-harvesting performance between these two controlling strategies through experimental modeling or numerical studies.Furthermore,the suitability of the fully activated control strategy in predicting the energy-harvesting capabilities of oscillating hydrofoils is evaluated.The 2D numerical models of hydrofoil based on fully activated and semi-activated control strategies have been developed and validated.The amplitudes of heaving and pitching movements for the fully activated hydrofoil are determined to match those of the semi-activated hydrofoil.The results show that the main difference between the two control strategies lies in the phase shift occurring between the pitching and heaving motions.This phase shift affects the lift force and its coordination with the heaving velocity,which in turn affects the power output.Notably,the maximum relative efficiency difference obtained between the fully activated and semi-activated control strategies can reach 191%.展开更多
This study scrutinizes the thermomechanical dynamics of 3D-printed hydrofoil blades utilizing a carbon and glass bead-reinforced thermoplastic polymer.Comparative analyses underscore the pivotal role of polymer reinfo...This study scrutinizes the thermomechanical dynamics of 3D-printed hydrofoil blades utilizing a carbon and glass bead-reinforced thermoplastic polymer.Comparative analyses underscore the pivotal role of polymer reinforcement in augmenting mechanical strength and mitigating deformation and residual stress.The investigation elucidates the expeditious and cost-efficient manufacturing potential of low-cost Fused Filament Fabrication(FFF)printers for small-scale blades,revealing exemplary mechanical performance with nominal deflection and warping in the PA12-CB/GB printed blade.A comprehensive juxtaposition between Selective Laser Sintering(SLS)and FFF printing methods favors SLS due to its isotropic properties,notwithstanding remediable warping.Emphasizing the rigorous marine environment,the study cautions against the anisotropic properties of FFF-printed blades,despite their low mechanical warping.These discernments contribute to hydrofoil design optimization through numerical analysis,shedding light on additive manufacturing’s potential for small blades in renewable energy,while underscoring the imperative for further research to advance these techniques.展开更多
基金supported by the Shandong Natural Science Foundation Youth Project(No.ZR2023QE075)the Open Project Program of Shandong Marine Aerospace Equipment Technological Innovation Center(No.MAETIC202210)the Shandong Natural Science Foundation Project(No.ZR2022ME145)。
文摘The oscillating hydrofoil represents a promising technology for harvesting energy from tidal currents.While previous research has primarily focused on oscillating hydrofoils utilizing a fully activated control strategy,the industry predominantly employs a semi-activated control strategy in existing tidal current energy converters.It is essential to identify the differences in predicted energy-harvesting performance between these two controlling strategies through experimental modeling or numerical studies.Furthermore,the suitability of the fully activated control strategy in predicting the energy-harvesting capabilities of oscillating hydrofoils is evaluated.The 2D numerical models of hydrofoil based on fully activated and semi-activated control strategies have been developed and validated.The amplitudes of heaving and pitching movements for the fully activated hydrofoil are determined to match those of the semi-activated hydrofoil.The results show that the main difference between the two control strategies lies in the phase shift occurring between the pitching and heaving motions.This phase shift affects the lift force and its coordination with the heaving velocity,which in turn affects the power output.Notably,the maximum relative efficiency difference obtained between the fully activated and semi-activated control strategies can reach 191%.
文摘This study scrutinizes the thermomechanical dynamics of 3D-printed hydrofoil blades utilizing a carbon and glass bead-reinforced thermoplastic polymer.Comparative analyses underscore the pivotal role of polymer reinforcement in augmenting mechanical strength and mitigating deformation and residual stress.The investigation elucidates the expeditious and cost-efficient manufacturing potential of low-cost Fused Filament Fabrication(FFF)printers for small-scale blades,revealing exemplary mechanical performance with nominal deflection and warping in the PA12-CB/GB printed blade.A comprehensive juxtaposition between Selective Laser Sintering(SLS)and FFF printing methods favors SLS due to its isotropic properties,notwithstanding remediable warping.Emphasizing the rigorous marine environment,the study cautions against the anisotropic properties of FFF-printed blades,despite their low mechanical warping.These discernments contribute to hydrofoil design optimization through numerical analysis,shedding light on additive manufacturing’s potential for small blades in renewable energy,while underscoring the imperative for further research to advance these techniques.
