Ice-Induced Unsteady Flowfield Effects on Airfoil Performance
Gurbacki, Holly Marie
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https://hdl.handle.net/2142/85080
Description
Title
Ice-Induced Unsteady Flowfield Effects on Airfoil Performance
Author(s)
Gurbacki, Holly Marie
Issue Date
2003
Doctoral Committee Chair(s)
Bragg, Michael B.
Department of Study
Aerospace Engineering
Discipline
Aerospace Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
Vortex structures observed in the shear layer were presumed to be the cause of large-scale pressure fluctuations upstream of reattachment at small angles of attack. Pressure spectra near reattachment exhibited wide bandwidth frequency peaks that indicated a non-periodic phenomenon and corresponded to the regular mode often associated with vortex movement in and aft of the shear layer. Strouhal numbers ranged from 0.53 to 0.73. Although vortex shedding was rarely observed, the convection of surface pressure fluctuations occurred at approximately half the freestream velocity, similar to shedding velocities reported by others.
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