Iced Airfoil Separation Bubble Measurements by Particle Image Velocimetry
Jacobs, Jason J.
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https://hdl.handle.net/2142/85103
Description
Title
Iced Airfoil Separation Bubble Measurements by Particle Image Velocimetry
Author(s)
Jacobs, Jason J.
Issue Date
2007
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, Aerospace
Language
eng
Abstract
Previous iced airfoil investigations have demonstrated somewhat reduced aerodynamic penalties resulting from a three-dimensional ice simulation, compared to those of a two-dimensional ice simulation of a representative cross section. Correspondingly, the current measurements revealed accelerated transition of the separated shear layer emanating from a three-dimensional ice simulation and therefore enhanced pressure recovery and reduced mean separation bubble length, each relative to the flowfield of a representative two-dimensional ice simulation. These effects appeared to result from the quasi-steady distribution of discrete, streamwise vortices which aided the turbulent entrainment of fluid from the recirculation region of the three-dimensional ice simulation separation bubble flowfield. These vortices were generated by a streamwise-vortex instability excited by roughness along the three-dimensional ice simulation and produced spanwise-cell structures throughout this flowfield, as well as significant spanwise variation in peak turbulence statistics. However, these variations were strongly correlated to the local degree of flowfield three-dimensionality observed from surface oil-flow visualization, indicating a three-dimensional relieving effect, such that measurements within a quasi-two-dimensional spanwise region were both qualitatively and quantitatively similar to those of the two-dimensional ice simulation separation bubble flowfield.
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