Results 101 to 110 of about 75,453 (130)
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The influence of a narrow channel on the performance of an oscillating hydrofoil power generator
Renewable EnergyGuanghua He, Hassan Ghassemi
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Optimum propulsion of an oscillating hydrofoil
IEEE Transactions on Automatic Control, 1966A study is made on the optimization aspect of marine propulsion in the light of optimum control theory for distributed parameter systems. In particular, the problem of determining the motion of a thin hydrofoil or a "thin fish" to maximize the average thrust in the presence of instantaneous or average power limitation constraint is considered ...
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Behaviors of two semi-passive oscillating hydrofoils with a tandem configuration
Energy, 2021Abstract Two hydrofoils with a tandem spatial configuration can share the same flow window. The wake vortex interaction and blockage effect have noticeable impacts on the response of two hydrofoils for a semi-passive system. In this study, the responses of two oscillating hydrofoils with a tandem arrangement are examined using a numerical approach ...
Penglei Ma +3 more
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Unsteady forces on oscillating hydrofoils
1966An experimental apparatus is described which has proved to be well suited to the determination of the unsteady lift forces on a hydrofoil oscillating in heave under a free surface. Results are presented for tests covering a wide range of reduced frequency with several foil models in fully wetted, base-ventilated, and supercavitating flow.
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Prototype testing of a hydrokinetic turbine based on oscillating hydrofoils
Renewable Energy, 2011Abstract A new concept of hydrokinetic turbine using oscillating hydrofoils to extract energy from water currents (tidal or gravitational) is presented and tested in this investigation. This technology is particularly well suited for riverbeds and shallow waters near the coasts due to its rectangular extraction plane.
T. Kinsey +7 more
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Effect of Hydrofoil Shapes on Partial and Transitional Cavity Oscillations
Journal of Fluids Engineering, 2007The effects of foil geometry on partial and transitional cavity oscillations were examined by experiments. The transitional cavity oscillation can be observed in the upstream pressure fluctuation for all foils and the amplitude of oscillation becomes larger when the maximum cavity length becomes larger than about 75% of the chord length.
Akira Fujii +3 more
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Generating controllable velocity fluctuations using twin oscillating hydrofoils
Journal of Fluid Mechanics, 2012AbstractAn experiment apparatus has been previously developed with the ability to independently control the instantaneous flow velocity in a water flume. This configuration, which uses two pitching hydrofoils to generate the flow fluctuations, allows the unsteady response of submerged structures to be studied over a wide range of driving frequencies ...
Harding, S. F., Bryden, I. G.
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NUMERICAL STUDY ON OSCILLATING HYDROFOILS FOR ENERGY EXTRACTION
Simulation results reveal that the fully prescribed system achieves a total efficiency of 38.6%, with heaving motion accounting for a heaving efficiency of 57.55% and a total average power output of 139.53 W. In contrast, the semi-passive model generates significant unsteady vertical motion—approximately three times larger in displacement—yet fails to ...openaire +1 more source
A Reduced-Order Model for an Oscillating Hydrofoil Near the Free Surface
SNAME 13th International Conference on Fast Sea Transportation, 2015The first objective of this work is to numerically investigate how the proximity to the free surface influences the hydrodynamic response and susceptibility to cavitation of a hydrofoil undergoing controlled pitching oscillations, for high-speed full-scale operating conditions. A second objective is to develop a time-domain Reduced Order Model (ROM) to
Rory C. Kennedy +2 more
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Fish-Inspired Hydrodynamic Study of Stationary, Undulating, and Oscillating Hydrofoils
2022A fish-inspired research, on flow across a hydrofoil that is stationary or mimicking various types of fish-inspired swimming, can reveal efficient flow mechanisms that can lead to a novel design and development of autonomous underwater vehicles (AUVs) or energy extraction devices. The present thesis starts with various flow transitions in the wake of a
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