Results 91 to 100 of about 123 (120)
Some of the next articles are maybe not open access.
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
openaire +1 more source
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 ...
openaire +1 more source
Testing and Analysis of an Oscillating Hydrofoils Turbine Concept
ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C, 2010A new concept of hydrokinetic turbine using oscillating hydrofoils to extract energy from water currents (tidal or gravitational) is presented, tested and analyzed in the present investigation. Due to its rectangular extraction plane, this technology is particularly well suited for river beds and shallow waters near the coasts. The present turbine is a
Thomas Kinsey, Guy Dumas
openaire +1 more source
Quantification of flow noise produced by an oscillating hydrofoil
Ocean Engineering, 2019Abstract After getting inspired from swimming natural species, a lot of research is being carried out in the field of unmanned underwater vehicles. During the last two decades, more emphasis on the associated hydrodynamic mechanisms, structural dynamics, control techniques and, its motion and path planning has been prominently witnessed in the ...
Muhammad Saif Ullah Khalid +2 more
openaire +1 more source
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.
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
Oscillating Hydrofoil Propulsion for Human-Powered Watercraft Applications
2013Unlike conventional propellers, flapping wings may generate large amplitude oscillating forces, which can make them difficult to incorporate into a craft design. This is particularly true for a single, vertically oscillating hydrofoil, as part of a surface water craft where the cyclic lift of the hydrofoil disrupts the craft stability.
openaire +2 more sources
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
openaire +1 more source
Energy extraction and hydrodynamic behavior analysis by an oscillating hydrofoil device
Renewable Energy, 2017Abstract In this paper, a modified model is proposed for an oscillating foil energy harvesting device, and the corresponding mathematical model is established too. A grid model for foil NACA0015 is built by using dynamic and moving mesh technology of the Computational Fluid Dynamics (CFD) software FLUENT.
Penglei Ma +4 more
openaire +1 more source