Time -Resolved Visualization and Analysis of Compressible Blunt -Base Cylinder Wakes
Kastengren, Alan Leonard
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https://hdl.handle.net/2142/83835
Description
Title
Time -Resolved Visualization and Analysis of Compressible Blunt -Base Cylinder Wakes
Author(s)
Kastengren, Alan Leonard
Issue Date
2005
Doctoral Committee Chair(s)
Dutton, J. Craig
Gregory Elliott
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
High-speed flow visualization of these wakes is also performed. Both conventional cross-correlation analysis and cross-correlation analysis conditioned on the coherent structures are performed to measure the convection velocity of the coherent structures. The coherent structures in the developing shear layers in side-view images of both wakes convect significantly faster than the isentropic convection velocity, and the structure convection velocity is highly sensitive to changes in the freestream flow velocity. The convection velocity of the structures is also highly dependent on the transverse position of the structures in the shear layer. Convection velocity measurements in the end-view images confirm that there is a significant circumferential component of structure convection velocity in the angle-of-attack wake. The pulsation and flapping of the wake core in end-view images contain a short time scale component due to the passage of individual structures and a long time scale component due to more global mechanisms.
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