Studies of Nonlinear Instabilities of Developing Wake Flows Behind Bluff Bodies and Their Control

1990 ◽  
Author(s):  
J. T. Liu
Keyword(s):  
Bluff Bodies ◽  
Wake Flows

On Vortex Formation in the Wake Flows of Transonic Turbine Blades and Oscillating Airfoils

2005 ◽  
Vol 128 (3) ◽  
pp. 528-535 ◽  
Author(s):  
J. P. Gostelow ◽  
M. F. Platzer ◽  
W. E. Carscallen
Keyword(s):  
Vortex Shedding ◽  
Turbine Blades ◽  
Vortex Formation ◽  
Energy Separation ◽  
Bluff Bodies ◽  
Wake Flows ◽  
Blunt Trailing Edge ◽  
Speed Flow ◽  
New Synthesis ◽  
Transonic Turbine

This paper demonstrates similarities between the vortex shedding from blunt trailing-edge transonic turbine nozzle blades and from oscillating airfoils and bluff bodies. Under subsonic conditions the turbine nozzle cascade shed wake vortices in a conventional von Kármán vortex street. This was linked with a depressed base pressure and associated energy separation in the wake. Under transonic conditions a variety of different shedding configurations was observed with vortices shedding and pairing in several different ways. Similarities are addressed between the observed structures and those from vortex shedding in some other physical situations, such as the vortex wakes shed from cylinders and airfoils in sinusoidal heaving motion in low-speed flow. The established field of vortex-induced vibration has provided a developed classification scheme for the phenomena observed. The paper has brought together three previously independent fields of investigation and, by showing that the three are essentially related, has provided the basis for a new synthesis.

Large-scale vortex structures in turbulent wakes behind bluff bodies. Part 2. Far-wake structures

1987 ◽  
Vol 174 ◽  
pp. 271-298 ◽  
Author(s):  
T. R. Steiner ◽  
A. E. Perry
Keyword(s):  
Large Scale ◽  
Bluff Body ◽  
Three Dimensional ◽  
Bluff Bodies ◽  
Mean Velocity ◽  
Wake Flows ◽  
Wake Patterns ◽  
Large Scale Vortex ◽  
High Reynolds ◽  
Far Wake

An investigation of a selection of high-Reynolds-number bluff-body flows was conducted. Here in Part 2 phase-averaged velocity-field results will be presented for several far-wake flows generated by nominally two-dimensional and three-dimensional bodies. In these far-wake flows the shed vortices have approached a nearly constant convection velocity. Some mean velocity and phase-averaged and global Reynoldsstress measurements are also presented. The turbulent wake of a lift-producing three-dimensional body has been examined. Also included are the phase-averaged wake patterns behind a flapping flag and a windmill. The topological structure of these patterns is discussed and a preliminary classification of wake patterns is presented.

On Vortex Formation in the Wake Flows of Transonic Turbine Blades and Oscillating Airfoils

2005 ◽  
Author(s):  
J. P. Gostelow ◽  
W. E. Carscallen ◽  
M. F. Platzer
Keyword(s):  
Vortex Shedding ◽  
Classification Scheme ◽  
Turbine Blades ◽  
Vortex Formation ◽  
Energy Separation ◽  
Bluff Bodies ◽  
Wake Flows ◽  
Speed Flow ◽  
New Synthesis ◽  
Transonic Turbine

This paper demonstrates similarities between the vortex shedding from blunt trailing-edged transonic turbine nozzle blades and from oscillating bluff bodies. Under subsonic conditions the turbine nozzle cascade shed wake vortices in a conventional von Ka´rma´n vortex-street. This was linked with a depressed base pressure and associated energy separation in the wake. Under transonic conditions a variety of different shedding configurations was observed with vortices shedding and pairing in several different ways. Similarities are addressed between the observed structures and those from vortex shedding in some other physical situations. The authors have investigated the similarity between the vortex wakes shed from cylinders and airfoils in sinusoidal heaving motion in low speed flow and the wakes shed from the turbine nozzle cascade in transonic flow. The established field of vortex-induced vibration has provided a developed classification scheme for the phenomena observed. The paper has brought together three previously unrelated fields of investigation and, by showing that the three are essentially related, has provided the basis for a new synthesis.

Fundamental Control of Wake Behind Bluff Bodies : A Review

2012 ◽  
Vol 2 (8) ◽  
pp. 134-135
Author(s):  
Dalbir Singh Dalbir Singh ◽  
◽  
M.M. Gaud M.M. Gaud ◽  
Jaswinder Singh Jaswinder Singh
Keyword(s):  
Bluff Bodies
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