{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/18400"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/18400","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Measurements of Small-Scale Propellers Operating in the Vortex Ring State","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Shetty, Omkar R."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Aerospace Engineering","degree_department":null,"school":null,"contributors":["Selig, Michael S."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-01-14T22:49:11Z","date_published":"2011-01-14T22:49:11Z","updated_at":"2026-07-22T22:25:11Z","subjects":["vortex ring state (VRS)","propeller tests"],"languages":["en"],"rights":["Copyright 2010 Omkar Ravindra Shetty"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/18400","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Selig, Michael S."]},{"key":"dc:creator","label":"Author","values":["Shetty, Omkar R."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-01-14T22:49:11Z","2010-12"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Aerospace Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["vortex ring state (VRS)","propeller tests"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2010 Omkar Ravindra Shetty"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/18400"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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). 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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). 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