Results 241 to 250 of about 2,612 (267)

Comparative study on the wake deflection behind yawed wind turbine models

Journal of Physics: Conference Series, 2017
In this wind tunnel campaign, detailed wake measurements behind two different model wind turbines in yawed conditions were performed. The wake deflections were quantified by estimating the rotor-averaged available power within the wake. By using two different model wind turbines, the influence of the rotor design and turbine geometry on the wake ...
Jannik Schottler, Franz Muhle, Jan Bartl   +2 more
exaly   +2 more sources

Vertical wake deflection for offshore floating wind turbines by differential ballast control

Journal of Physics: Conference Series, 2020
Abstract This paper discusses the idea of vertical wake deflection for offshore wind turbines using active ballast control. First, the concept of active ballast control for changing the attitude of an offshore wind energy semi-submersible platform is presented and briefly explored.
Stefano Letizia, Mario A Rotea, Carlo L Bottasso   +2 more
exaly   +2 more sources

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Three-dimensional transition after wake deflection behind a flapping foil

Physical Review E, 2015
We report the inherently three-dimensional linear instabilities of a propulsive wake, produced by a flapping foil, mimicking the caudal fin of a fish or the wing of a flying animal. For the base flow, three sequential wake patterns appear as we increase the flapping amplitude: Bénard-von Kármán (BvK) vortex streets; reverse BvK vortex streets; and ...
Jian, Deng, C P, Caulfield
openaire   +2 more sources

Observations of Acoustic Ray Deflection by Aircraft Wake Vortices

Journal of the Acoustical Society of America, 1972
Acoustic ray deflection by aircraft wake vortex flows has been observed during landing operations of large aircraft. The phenomenon has been used to detect and locate vortex traces in a plane perpendicular to the runway centerline. The maximum deflection angles observed for a variety of aircraft show qualitative agreement with values predicted for a ...
D. Burnham, R. Kodis, T. Sullivan
exaly   +2 more sources

Numerical study of the wake induced by a porous disk under deflected inflow

Heat Transfer, 2022
AbstractThis study examines the wake of a porous disk that generates a velocity deficit equivalent to that of a wind turbine. Three‐dimensional unsteady numerical simulations based on the finite volume method are performed. The URANS‐SST (k–ω) model is applied for the turbulence closure.
Sihème Guezmir, Amina Mataoui, Ouahiba Guerri   +2 more
openaire   +1 more source

A novel dynamic wake model for prediction of wind speed and power production considering wake propagation velocity and deflection

Applied Energy
Takeshi Ishihara
exaly   +2 more sources

Engineering models for turbine wake velocity deficit and wake deflection. A new proposed approach for onshore and offshore applications

Journal of Physics: Conference Series, 2019
Abstract An engineering wake model based on the Ainslie model is proposed. The eddy viscosity term associated with momentum diffusivity is modified to take into account the effects of atmospheric stability. The parameters used are typically available from high-quality on-site measurement campaigns and the effects of atmospheric stability
Renzo Ruisi, Ervin Bossányi
exaly   +2 more sources

Study of Deflected Wake Phenomena by 2D Unsteady Vortex Lattice

50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2009
Point vortex calculations are compared to experimental results for a 2D pitching and plunging airfoil. The point vortex method is then used to simulate a flat plate in high frequency pitch, plunge, and combined motions. Low frequency motion causes the wake to convect away from the trailing edge parallel to the freestream.
Christopher Chabalko, Richard Snyder, Philip Beran, Michael Ol   +3 more
openaire   +1 more source

Experimental and Computational Analysis of an Expansion Deflection Nozzle in Open-Wake Mode

26th AIAA Applied Aerodynamics Conference, 2008
This paper presents a rapid solution method for flows within an Expansion Deflection nozzle operating within the atmosphere. The technique is based primarily on the Method of Characteristics, with integrated solution of the Rankine Hugoniot shock equations.
Neil Taylor, Tetsuya Sato
openaire   +1 more source

Deflected oscillatory wake pattern behind two side-by-side circular cylinders

Ocean Engineering, 2020
Abstract Wake flow behind structures is of fundamental significance and practical interest in ocean engineering. Several asymmetric flow patterns, such as the deflected stationary, flip-flop and deflected oscillatory wakes, behind two cylinders in a side-by-side arrangement have been reported most recently.
Bai, X., Zhang, W., Wang, Y.
openaire   +2 more sources