Results 161 to 170 of about 66,556 (207)

A longitudinal vortex wind turbine: Numerical study

Journal of Wind Engineering and Industrial Aerodynamics, 2018
Abstract The longitudinal vortex wind turbine (LV-WT) is a new windmill concept which uses circular cylinders as the turbine blades and not Magnus rotors. The driving force is produced by the longitudinal vortex (LV). A ring-shaped plate is installed behind the circular blades for employing the LV.
Withun Hemsuwan, Kasumi Sakamoto, Shota Nakada, Tsutomu Takahashi   +3 more
openaire   +1 more source

Longitudinal vortex structures in a cylinder wake

Physics of Fluids, 1994
This paper presents the velocity field of the longitudinal vortices found in the wake of a circular cylinder, as measured using digital particle image velocimetry (PIV). Vorticity and circulation of the longitudinal vortices are presented, based on instantaneous velocity distributions in a transverse plane behind the cylinder.
J. Wu, J. Sheridan, M. C. Welsh, K. Hourigan, M. Thompson   +4 more
openaire   +1 more source

The Interaction Between Horseshoe Vortex and Longitudinal Vortices From the Vortex Generators

Volume 7: Turbomachinery, Parts A, B, and C, 2010
A horseshoe vortex at the blade-endwall junction introduces the reduction of turbine blade performance due to the three dimensional separation near the stagnation point of the blade and the interaction of the two legs of the horseshoe vortex in the turbine cascade passage.
Masaharu Andoh, Masahiro Motosuke, Shinji Honami   +2 more
openaire   +1 more source

Performance Analysis for Elliptical Tube Longitudinal Vortex Generators

Advanced Materials Research, 2011
In this paper, three-dimensional numerical simulation is conducted on the flow and heat transfer process for elliptical tube heat exchanger with rectangular vortex generators and triangular vortex generator by Fluent software, respectively, and the performance for elliptical tube heat exchanger with plate fin is compared.
Jun Jie Zhou, Xue Hong Wu, Xiao Qian Li, Jin Yin Huang, Ding Biao Wang   +4 more
openaire   +1 more source

Synthesis and spatial evolution of longitudinal coherence vortex

SPIE Proceedings, 2005
By controlling the irradiance of an extended quasi-monochromatic, spatially incoherent source with a spatial light modulator, we generated a special optical field that exhibits a high degree of coherence with phase singularities for a specific pair of points at specified locations along the axis of beam propagation.
Wei Wang, Zhihui Duan, Steen G. Hanson, Yoko Miyamoto, Mitsuo Takeda   +4 more
openaire   +1 more source

Longitudinal vortex control — techniques and applications

The Aeronautical Journal, 1992
AbstractLongitudinal vortices have tremendous practical utility for flow control (control by vortices) and in some cases have exhibited tremendous potential for causing harm if uncontrolled (i.e. control of vortices is required). Vortex control has thus far been carried out via multitudinous approaches in an empirical fashion, aided by the essentially ...
openaire   +1 more source

Turbulence Receptivity of Longitudinal Vortex-Dominated Flows

2009
The transient effect of turbulence forcing on an isolated vortex has been investigated by means of Large Eddy simulation. A dynamicmixed model is used to relate resolved and subgrid scale fluctuations in an incompressible CFD code. The initial condition is an Oseen vortex developing in a periodic box and subsequently forced by a superimposed turbulence.
C. Moldoveanu, A. Giovannini, H. C. Boisson   +2 more
openaire   +1 more source

Wave-induced longitudinal-vortex instability in shear flows

Journal of Fluid Mechanics, 1982
The instability of two-dimensional periodic flows to spanwise-periodic ‘longitudinal- vortex’ modes is examined. The undisturbed state comprises a parallel shear flow and a two-dimensional O(ε) wave field as encountered in, say, water-wave or hydrodynamic-stability theories.
openaire   +2 more sources

Experimental analysis of longitudinal vortex dynamics

AIAA AVIATION 2022 Forum, 2022
Rathje, Nils, Ströer, Philip, Weiner, Andre, Knopp, Tobias, Probst, Axel, Radespiel, Rolf   +5 more
openaire   +2 more sources

Effect of Actuating Mode in Active Vortex Generators on the Behavior of Longitudinal Vortex Pair

47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition, 2009
Effect of actuating mode of a pair of active-vortex generators (AVG) was investigated in three modes in combinations with solid and active modes under co-rotating configuration. The measurements of three components of velocity were made by using a rotating X-type hotwire anemometer.
Yuki Honda, Hirokazu Hattori, Masahiro Motosuke, Shinji Honami   +3 more
openaire   +1 more source