Title page for ETD etd-0110102-201212

Document Type thesis

Author Name McIlhenny, Julia F

Email Address juliemci at aol.com

URN etd-0110102-201212

Title Artificial Turbulent Bursts

Degree MS

Department Mechanical Engineering

Advisors
Dr. William W. Durgin, Advisor
Dr. David J. Olinger, Committee Member
Dr. Michael A. Demetriou, Committee Member
Dr. Zhikun Hou, Graduate Committee Rep

Keywords
turbulence
artificial generation of turbulent bursts

Date of Presentation/Defense 2002-01-04

Availability unrestricted

Abstract
To gain understanding of the physical and structural events in the turbulent bursting process, an effort to generate artificial bursts in a turbulent boundary layer was made. Turbulent bursts, which are both random in time and in space, and cause a large portion of drag of a turbulent boundary layer. Control of the bursts could yield a decrease in skin friction and hence drag. Data were taken in a turbulent boundary layer developed over a flat plate in a low-speed wind tunnel with an array of eight hot-wire probes. The turbulent burst like events were created by pitching a rectangular shaped piezoelectric bimorph actuator out into the flow. The actuator effect is proposed which models the production of counter-rotating vortices in a rectangular vortex filament configuration. The results are compared with naturally occurring bursts and data from previous studies. Knowing more about the turbulent bursting process gives us more opportunities to control the turbulent bursts and therefore reduce drag over airfoils.

Files
mcilhenny.pdf

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Document Type	thesis
Author Name	McIlhenny, Julia F
Email Address	juliemci at aol.com
URN	etd-0110102-201212
Title	Artificial Turbulent Bursts
Degree	MS
Department	Mechanical Engineering
Advisors	Dr. William W. Durgin, Advisor Dr. David J. Olinger, Committee Member Dr. Michael A. Demetriou, Committee Member Dr. Zhikun Hou, Graduate Committee Rep
Keywords	turbulence artificial generation of turbulent bursts
Date of Presentation/Defense	2002-01-04
Availability	unrestricted
Abstract To gain understanding of the physical and structural events in the turbulent bursting process, an effort to generate artificial bursts in a turbulent boundary layer was made. Turbulent bursts, which are both random in time and in space, and cause a large portion of drag of a turbulent boundary layer. Control of the bursts could yield a decrease in skin friction and hence drag. Data were taken in a turbulent boundary layer developed over a flat plate in a low-speed wind tunnel with an array of eight hot-wire probes. The turbulent burst like events were created by pitching a rectangular shaped piezoelectric bimorph actuator out into the flow. The actuator effect is proposed which models the production of counter-rotating vortices in a rectangular vortex filament configuration. The results are compared with naturally occurring bursts and data from previous studies. Knowing more about the turbulent bursting process gives us more opportunities to control the turbulent bursts and therefore reduce drag over airfoils.
Files	mcilhenny.pdf