2026-09-18T18:53:04Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/18400 2023-07-10 col_2142_5131 col_2142_14800 com_2142_5130 com_2142_14799 com_2142_234

Selig, Michael S. Shetty, Omkar R. 2011-01-14T22:49:11Z 2011-01-14T22:49:11Z 2011-01-14T22:49:11Z The behavior of small-scale propellers operating in vertical descent and through the vortex ring state (VRS) was measured. In particular, a total of 26 propellers with varying diameters (9 to 11 in) were tested in the UIUC 2.8 x 4 ft wind tunnel at low Reynolds numbers to measure the propeller thrust over a range of advance ratios from -0.8 to 0. Also, time histories of the measured thrust for different propellers were recorded to characterize the unsteady thrust fluctuations for advance ratios through the vortex ring state. The effects of propeller geometry, e.g. pitch and planform effects, on the thrust characteristics of these propellers in the VRS are discussed. The motivation of this research is to understand better, the phenomenon of VRS observed in helicopter rotors in descent. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-12-10T19:58:52Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Shetty_Omkar.pdf: 37939436 bytes, checksum: ca0c35e122f8b2f03e7d033b20213714 (MD5) Made available in DSpace on 2011-01-14T22:49:11Z (GMT). No. of bitstreams: 2 Shetty_Omkar.pdf: 37939436 bytes, checksum: ca0c35e122f8b2f03e7d033b20213714 (MD5) license.txt: 4062 bytes, checksum: ab95ed58870d27a7c946c2079c2c9931 (MD5) http://hdl.handle.net/2142/18400 en Copyright 2010 Omkar Ravindra Shetty vortex ring state (VRS) propeller tests Measurements of Small-Scale Propellers Operating in the Vortex Ring State 2010-12 Aerospace Engineering 1615 Aerospace Engineering 4048 University of Illinois at Urbana-Champaign Thesis M.S. MS: Aerospace Engr -UIUC 10KS4048MS