{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/104907"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/104907","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Investigating the frequency behavior of fluidic oscillators and their application as active flow control for an SNLF airfoil","abstract":"This current study was performed to investigate the effect of geometric variation on the frequency behavior of fluidic oscillators. Fluidic oscillators are able to passively generate a self-induced, self-sustained sweeping planar jet that is highly dependent on internal geometries and inlet conditions. Frequency data was collected for 78 parametric variations of fluidic oscillators under different inlet conditions. A multi-variate non-linear regression procedure was used to build a model to predict the frequency behavior of a fluidic oscillator given a set of internal geometries and inlet conditions. The SNLF S414 airfoil is a multi-element airfoil with an open slot to promote a laminar boundary layer across the entire fore element and large portions of the aft element. Active unsteady flow control using embedded fluidic oscillators was identified as a potential source to improve the flow field and maximize the lift of a multi-element system like the SNLF S414. The predictive model was used to design a set of fluidic oscillators to reach desired non-dimensional frequencies and 𝐶𝜇 when embedded in the SNLF S414 airfoil. The SNLF S414 airfoil was tested at 𝑅𝑒𝑐 = 1.8𝑥10^6 in a 3-ft x 4-ft low-speed, low-turbulence wind tunnel with fluidic oscillators embedded in the aft element at x/c = 0.7 and x/c = 0.8 and applied actuation at various 𝐶𝜇. Two different configurations of the SNLF S414 airfoil were tested with and without the applied actuation at both locations. This data will be used to inform additional studies investigating multi-element SNLF style airfoils with unsteady active flow control.","abstract_html":"This current study was performed to investigate the effect of geometric variation on the frequency behavior of fluidic oscillators. Fluidic oscillators are able to passively generate a self-induced, self-sustained sweeping planar jet that is highly dependent on internal geometries and inlet conditions. Frequency data was collected for 78 parametric variations of fluidic oscillators under different inlet conditions. A multi-variate non-linear regression procedure was used to build a model to predict the frequency behavior of a fluidic oscillator given a set of internal geometries and inlet conditions. The SNLF S414 airfoil is a multi-element airfoil with an open slot to promote a laminar boundary layer across the entire fore element and large portions of the aft element. Active unsteady flow control using embedded fluidic oscillators was identified as a potential source to improve the flow field and maximize the lift of a multi-element system like the SNLF S414. The predictive model was used to design a set of fluidic oscillators to reach desired non-dimensional frequencies and 𝐶𝜇 when embedded in the SNLF S414 airfoil. The SNLF S414 airfoil was tested at 𝑅𝑒𝑐 = 1.8𝑥10^6 in a 3-ft x 4-ft low-speed, low-turbulence wind tunnel with fluidic oscillators embedded in the aft element at x/c = 0.7 and x/c = 0.8 and applied actuation at various 𝐶𝜇. Two different configurations of the SNLF S414 airfoil were tested with and without the applied actuation at both locations. This data will be used to inform additional studies investigating multi-element SNLF style airfoils with unsteady active flow control.","abstract_has_math":false,"creators":["Colletti, Christopher"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Aerospace Engineering","degree_department":null,"school":null,"contributors":["Ansell, Phillip J."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-08-23T20:01:13Z","date_published":"2019-08-23T20:01:13Z","updated_at":"2026-07-22T22:24:42Z","subjects":["Fluidic Oscillator","S414","Active Flow Control","Aerodynamics","Natural Laminar Flow","Multi Element Airfoil"],"languages":["en"],"rights":["Copyright 2019 Christopher Colletti"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/104907","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Ansell, Phillip J."]},{"key":"dc:creator","label":"Author","values":["Colletti, Christopher"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2019-08-23T20:01:13Z","2019-04-24","2019-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"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":["Fluidic Oscillator","S414","Active Flow Control","Aerodynamics","Natural Laminar Flow","Multi Element Airfoil"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2019 Christopher Colletti"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/104907"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This current study was performed to investigate the effect of geometric variation on the frequency behavior of fluidic oscillators. Fluidic oscillators are able to passively generate a self-induced, self-sustained sweeping planar jet that is highly dependent on internal geometries and inlet conditions. Frequency data was collected for 78 parametric variations of fluidic oscillators under different inlet conditions. A multi-variate non-linear regression procedure was used to build a model to predict the frequency behavior of a fluidic oscillator given a set of internal geometries and inlet conditions. The SNLF S414 airfoil is a multi-element airfoil with an open slot to promote a laminar boundary layer across the entire fore element and large portions of the aft element. Active unsteady flow control using embedded fluidic oscillators was identified as a potential source to improve the flow field and maximize the lift of a multi-element system like the SNLF S414. The predictive model was used to design a set of fluidic oscillators to reach desired non-dimensional frequencies and 𝐶𝜇 when embedded in the SNLF S414 airfoil. The SNLF S414 airfoil was tested at 𝑅𝑒𝑐 = 1.8𝑥10^6 in a 3-ft x 4-ft low-speed, low-turbulence wind tunnel with fluidic oscillators embedded in the aft element at x/c = 0.7 and x/c = 0.8 and applied actuation at various 𝐶𝜇. Two different configurations of the SNLF S414 airfoil were tested with and without the applied actuation at both locations. This data will be used to inform additional studies investigating multi-element SNLF style airfoils with unsteady active flow control.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2019-08-22 without embargo terms","The student, Christopher Colletti, accepted the attached license on 2019-04-23 at 12:27.","The student, Christopher Colletti, submitted this Thesis for approval on 2019-04-23 at 13:19.","This Thesis was approved for publication on 2019-04-24 at 13:32.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13840 on 2019-08-22 at 14:46:04","Made available in DSpace on 2019-08-23T20:01:13Z (GMT). No. of bitstreams: 2 COLLETTI-THESIS-2019.pdf: 4672219 bytes, checksum: eef15267366a55b530af680adc546cba (MD5) LICENSE.txt: 4217 bytes, checksum: 49f395abba0d897d0801ea853eaea71e (MD5) Previous issue date: 2019-04-24"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Investigating the frequency behavior of fluidic oscillators and their application as active flow control for an SNLF airfoil"]}]}],"canonical_facts":{"dc:contributor":["Ansell, Phillip J."],"dc:creator":["Colletti, Christopher"],"dc:date":["2019-08-23T20:01:13Z","2019-04-24","2019-05"],"dc:description":["This current study was performed to investigate the effect of geometric variation on the frequency behavior of fluidic oscillators. Fluidic oscillators are able to passively generate a self-induced, self-sustained sweeping planar jet that is highly dependent on internal geometries and inlet conditions. Frequency data was collected for 78 parametric variations of fluidic oscillators under different inlet conditions. A multi-variate non-linear regression procedure was used to build a model to predict the frequency behavior of a fluidic oscillator given a set of internal geometries and inlet conditions. The SNLF S414 airfoil is a multi-element airfoil with an open slot to promote a laminar boundary layer across the entire fore element and large portions of the aft element. Active unsteady flow control using embedded fluidic oscillators was identified as a potential source to improve the flow field and maximize the lift of a multi-element system like the SNLF S414. The predictive model was used to design a set of fluidic oscillators to reach desired non-dimensional frequencies and 𝐶𝜇 when embedded in the SNLF S414 airfoil. The SNLF S414 airfoil was tested at 𝑅𝑒𝑐 = 1.8𝑥10^6 in a 3-ft x 4-ft low-speed, low-turbulence wind tunnel with fluidic oscillators embedded in the aft element at x/c = 0.7 and x/c = 0.8 and applied actuation at various 𝐶𝜇. Two different configurations of the SNLF S414 airfoil were tested with and without the applied actuation at both locations. This data will be used to inform additional studies investigating multi-element SNLF style airfoils with unsteady active flow control.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2019-08-22 without embargo terms","The student, Christopher Colletti, accepted the attached license on 2019-04-23 at 12:27.","The student, Christopher Colletti, submitted this Thesis for approval on 2019-04-23 at 13:19.","This Thesis was approved for publication on 2019-04-24 at 13:32.","DSpace SAF Submission Ingestion Package generated from Vireo submission #13840 on 2019-08-22 at 14:46:04","Made available in DSpace on 2019-08-23T20:01:13Z (GMT). No. of bitstreams: 2 COLLETTI-THESIS-2019.pdf: 4672219 bytes, checksum: eef15267366a55b530af680adc546cba (MD5) LICENSE.txt: 4217 bytes, checksum: 49f395abba0d897d0801ea853eaea71e (MD5) Previous issue date: 2019-04-24"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/2142/104907"],"dc:language":["en"],"dc:rights":["Copyright 2019 Christopher Colletti"],"dc:subject":["Fluidic Oscillator","S414","Active Flow Control","Aerodynamics","Natural Laminar Flow","Multi Element Airfoil"],"dc:title":["Investigating the frequency behavior of fluidic oscillators and their application as active flow control for an SNLF airfoil"],"dc:type":["text"],"thesis:degree_discipline":["Aerospace Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:42Z"}