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dc.contributor.authorDelale, Can Fuaten_US
dc.contributor.authorZafer, Bahaen_US
dc.contributor.authorAslan, Alim Rüstemen_US
dc.date.accessioned2015-01-15T23:02:05Z
dc.date.available2015-01-15T23:02:05Z
dc.date.issued2012-09-01
dc.identifier.citationDelale, C., Zafer, B. & Aslan, A. (2012). A refinement of asymptotic predictions and full numerical solution of helicopter rotor noise in the far field. International Journal of Aeroacoustics, 11(3-4), 521-530. doi:10.1260/1475-472X.11.3-4.521en_US
dc.identifier.issn1475-472X
dc.identifier.otherWOS:000307141200009
dc.identifier.urihttps://hdl.handle.net/11729/466
dc.identifier.urihttp://dx.doi.org/10.1260/1475-472X.11.3-4.521
dc.description.abstractThe asymptotic analysis of Parry and Crighton [1] for propeller noise in the far field, which is based on Hanson's formulation [2] of the FW-H equation, is refined to second order by Laplace's method [3] for evaluating integrals, accounting for second order contributions near the blade tip for loading and thickness noise. The full numerical solution of Hanson's integrals for both thickness and loading noise is also presented. In particular, the theory is applied to a four-bladed helicopter rotor with tip Mach numbers ranging between 0.5 and 0.7. The aerodynamic loading in this case is obtained using a 3D compressible code based on finite volume method with intensified grid density near the blade tip. The far field angular SPL noise distributions of a helicopter rotor in hover show that the present second order asymptotic formula is in better agreement with full numerical computations than that of the first order formula, especially for thickness noise.en_US
dc.description.sponsorshipThis work was supported in part by Turkish Prime Ministry State Planning Organization (DPT) under program of Advanced Technologies Research and Education Program, project number: 2001K120750 90-146. The authors would like to thank Mr. A. Levent Sen for his help in some of the computationsen_US
dc.language.isoengen_US
dc.publisherMulti-Science Publ Co Ltden_US
dc.relation.isversionof10.1260/1475-472X.11.3-4.521
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectPropellersen_US
dc.subjectRotorsen_US
dc.subjectInstallation effectsen_US
dc.subjectAerodynamic loadingen_US
dc.subjectAsymptotic formulaen_US
dc.subjectBlade tipen_US
dc.subjectFar fielden_US
dc.subjectFirst-order formulasen_US
dc.subjectFull numerical solutionen_US
dc.subjectFW-H equationen_US
dc.subjectGrid densityen_US
dc.subjectNoise distributionen_US
dc.subjectNumerical computationsen_US
dc.subjectPropeller noiseen_US
dc.subjectSecond ordersen_US
dc.subjectThickness noiseen_US
dc.subjectAerodynamicsen_US
dc.subjectAsymptotic analysisen_US
dc.subjectFinite volume methoden_US
dc.subjectMach numberen_US
dc.subjectLaplace equationen_US
dc.subjectSingle-Rotation Propelleren_US
dc.titleA refinement of asymptotic predictions and full numerical solution of helicopter rotor noise in the far fielden_US
dc.typearticleen_US
dc.description.versionPublisher's Versionen_US
dc.relation.journalInternational Journal of Aeroacousticsen_US
dc.contributor.departmentIşık Üniversitesi, Mühendislik Fakültesi, Makine Mühendisliği Bölümüen_US
dc.contributor.departmentIşık University, Faculty of Engineering, Department of Mechanical Engineeringen_US
dc.contributor.authorID0000-0002-4577-9201
dc.identifier.volume11
dc.identifier.issue3-4
dc.identifier.startpage521
dc.identifier.endpage529
dc.peerreviewedYesen_US
dc.publicationstatusPublisheden_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.contributor.institutionauthorDelale, Can Fuaten_US


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