Worcester Polytechnic Institute Electronic Theses and Dissertations Collection

Title page for ETD etd-0110102-201212


Document Typethesis
Author NameMcIlhenny, Julia F
Email Address juliemci at aol.com
URNetd-0110102-201212
TitleArtificial Turbulent Bursts
DegreeMS
DepartmentMechanical 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/Defense2002-01-04
    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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