Time -Resolved Visualization and Analysis of Compressible Blunt -Base Cylinder Wakes

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Kastengren, Alan Leonard

Contributors dc:contributor

• Dutton, J. Craig
• Gregory Elliott

• Engineering, Mechanical

Language dc:language

eng

Identifier

(MiAaPQ)AAI3199041

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/83835