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Title:Time -Resolved Visualization and Analysis of Compressible Blunt -Base Cylinder Wakes
Author(s):Kastengren, Alan Leonard
Doctoral Committee Chair(s):Dutton, J. Craig; Gregory Elliott
Department / Program:Mechanical Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Mechanical
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.
Issue Date:2005
Description:213 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2005.
Other Identifier(s):(MiAaPQ)AAI3199041
Date Available in IDEALS:2015-09-25
Date Deposited:2005

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