Hairpin vortex structures in a supersonic, separated, longitudinal cylinder wake

2020 ◽  
Vol 32 (4) ◽  
pp. 046103 ◽  
Author(s):  
Branden M. Kirchner ◽  
Gregory S. Elliott ◽  
J. Craig Dutton
Keyword(s):  
Vortex Structures ◽  
Hairpin Vortex ◽  
Cylinder Wake

scholarly journals The Formation of Vortex Structures in a Screen Cylinder Wake

2017 ◽  
Vol 234 ◽  
pp. 012015 ◽  
Author(s):  
Azlin Mohd Azmi ◽  
Yucen Lu ◽  
Tongming Zhou
Keyword(s):  
Vortex Structures ◽  
Cylinder Wake

Study of Buoyancy Induced Suppression of Cylinder Wake Instability Using Schlieren-Interferometry

2007 ◽  
Author(s):  
S. K. Singh ◽  
P. K. Panigrahi
Keyword(s):  
Vortex Shedding ◽  
Heat Input ◽  
Richardson Number ◽  
Shear Layers ◽  
Vortex Structures ◽  
Schlieren Image ◽  
Cylinder Wake ◽  
Mean Flow ◽  
Experimental Conditions ◽  
Thermal Buoyancy

The control of horizontal square cylinder wake using thermal buoyancy has been experimentally investigated at low Reynolds numbers. The cylinder with an aspect ratio of 60 is mounted in a vertical test cell. The cylinder is electrically heated such that the buoyancy aids to the inertia of the mean flow. The operating parameters i.e. Reynolds number (87–118) and Richardson number (0.065–0.171) are varied to examine the flow behaviour over a range of experimental conditions. Laser schlieren-interferometry has been used for visualization and analysis of flow structures. The complete vortex shedding sequence has been recorded using a highspeed camera. The suppression of vortex shedding by heat input has been demonstrated by schlieren image visualization, time traces of light intensity, corresponding power spectra and Strouhal number. The study provides new experimental information on processes and mechanisms involved in the heat-induced changes of the vortex structures under the influence of buoyancy. The formation length of the vortex structures increases with increase in Richardson number i.e. heating level. The sequence of instantaneous schlieren images show that shape of vortex structures becomes slender at a sufficiently high Richardson number and the vortices from opposite shear layers rub with each other without increasing the circulation level and the two shear layers combine to form a single plume. The plume becomes steady at critical value of heat input leading to suppression of vortex shedding. The corresponding spectra evolve from having a clear peak at the vortex shedding frequency to broadband spectra when vortex shedding is suppressed.

Longitudinal vortex structures in a cylinder wake

1994 ◽  
Vol 6 (9) ◽  
pp. 2883-2885 ◽  
Author(s):  
J. Wu ◽  
J. Sheridan ◽  
M. C. Welsh ◽  
K. Hourigan ◽  
M. Thompson
Keyword(s):  
Vortex Structures ◽  
Longitudinal Vortex ◽  
Cylinder Wake

Near wall vortex structures in an inclined cylinder wake

1998 ◽  
Author(s):  
Takaaki Shizawa ◽  
Shinji Honami ◽  
Kotaro Miyauchi
Keyword(s):  
Vortex Structures ◽  
Cylinder Wake ◽  
Near Wall

Physics of multiple level hairpin vortex structures in turbulence

2016 ◽  
Vol 59 (2) ◽  
Author(s):  
YiQian Wang ◽  
Hassan Al-Dujaly ◽  
YongHua Yan ◽  
Ning Zhao ◽  
ChaoQun Liu
Keyword(s):  
Vortex Structures ◽  
Hairpin Vortex ◽  
Multiple Level

ON IMPACT OF LARGE-SCALE VORTEX STRUCTURES ON FLAME SHAPE IN A SWIRLING JET FLOW

2018 ◽  
Vol 11 (2) ◽  
pp. 31-39
Author(s):  
L. М. Chikishev ◽  
◽  
V. М. Dulin ◽  
A. S. Lobasov ◽  
D. М. Markovich ◽  
...  
Keyword(s):  
Large Scale ◽  
Jet Flow ◽  
Vortex Structures ◽  
Swirling Jet ◽  
Large Scale Vortex ◽  
Flame Shape
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