Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/5696
Full metadata record
DC FieldValueLanguage
dc.contributor.authorYemenici, O.-
dc.contributor.authorUzol, N. S.-
dc.contributor.authorUzol, O.-
dc.date.accessioned2021-09-11T15:19:39Z-
dc.date.available2021-09-11T15:19:39Z-
dc.date.issued2010en_US
dc.identifier.citation36th European Rotorcraft Forum, ERF 2010, 7 September 2010 through 9 September 2010, , 136624en_US
dc.identifier.isbn9781510854765-
dc.identifier.urihttps://hdl.handle.net/20.500.11851/5696-
dc.description.abstractThis paper presents an investigation of the aerodynamic interactions between two UH-1H helicopter rotors in forward flight. The wake flow structure and performance characteristics of the rotors are investigated when the rear rotor is operating within the wake of the front rotor. A 3-D unsteady vortex-panel method potential flow solver based on a free-vortex-wake methodology is used for this purpose. The solver is validated using the experimental data from the Caradonna-Tung experiments. The interactional analyses are performed for 10 different positions of the rear rotor with respect to the front rotor. The wake of the front rotor, which is generated due to the mutual interactions of the wake and tip vortices, is significantly asymmetric and non-uniform. Therefore the rear rotor operates within a complex and vortical free-stream flow. The wake-rotor interactions cause substantial variations in the forces generated by the rear rotor. The asymmetries in the wake geometry in forward flight cause changes in performance characteristics of the rear rotor when it is operating at the retreating and advancing sides of the front rotor. The decrease in vertical lifting is more when the rear rotor is operating within the wake of the advancing side. A frequency spectrum analysis of the force and moment fluctuations of the rear rotor shows that for the vertical force component the rear rotor experiences a dominant peak at two times the blade passing frequency, except when the rear rotor is operating within the wake of the advancing side of the front rotor. Other peaks at different harmonics are also observed and the location of these peaks in the frequency spectrum depends on the lateral position of the rear rotor with respect to the front one. Moment fluctuations generally are similar for the front and rear rotors except for the pitching moment which show fluctuations at two times the blade passing frequency illustrating that the pitching moment gets influenced by the wake interactions more than the other two moment components. © 2010 Association Aeronautique et Astronautique de France. All rights reserved.en_US
dc.description.sponsorshipEurocopter;Onera;Thales;Turbomeca and Sagemen_US
dc.language.isoenen_US
dc.publisherAssociation Aeronautique et Astronautique de Franceen_US
dc.relation.ispartof36th European Rotorcraft Forum, ERF 2010en_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.titleEffects of Rotor-Rotor Interactions on Aerodynamic Loads for Two Helicopters in Forward Flighten_US
dc.typeConference Objecten_US
dc.departmentFaculties, Faculty of Engineering, Department of Mechanical Engineeringen_US
dc.departmentFakülteler, Mühendislik Fakültesi, Makine Mühendisliği Bölümütr_TR
dc.identifier.volume1en_US
dc.identifier.startpage271en_US
dc.identifier.endpage281en_US
dc.identifier.scopus2-s2.0-85048671391en_US
dc.institutionauthorSezer Uzol, Nilay-
dc.relation.publicationcategoryKonferans Öğesi - Uluslararası - Kurum Öğretim Elemanıen_US
dc.relation.conference36th European Rotorcraft Forum, ERF 2010en_US
item.openairetypeConference Object-
item.languageiso639-1en-
item.grantfulltextnone-
item.fulltextNo Fulltext-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.cerifentitytypePublications-
Appears in Collections:Makine Mühendisliği Bölümü / Department of Mechanical Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Show simple item record



CORE Recommender

Page view(s)

44
checked on Dec 23, 2024

Google ScholarTM

Check




Altmetric


Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.