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oai:www.ideals.illinois.edu:2142/85103 2023-07-11 col_2142_5131 col_2142_14800 com_2142_5130 com_2142_14799 com_2142_234

Bragg, Michael B. Jacobs, Jason J. 2015-09-25T22:34:26Z 2015-09-25T22:34:26Z 10000-01-01 2007 2007 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. Made available in DSpace on 2015-09-25T22:34:26Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3290256.pdf: 15976699 bytes, checksum: 35b8fa3574e2f5e88098db11a5940aaf (MD5) Previous issue date: 2007 Embargo set by: Seth Robbins for item 86384 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 416 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007. http://hdl.handle.net/2142/85103 (MiAaPQ)AAI3290256 eng Engineering, Aerospace Iced Airfoil Separation Bubble Measurements by Particle Image Velocimetry text Aerospace Engineering Aerospace Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.