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Ahmed, S.R. und Yin, J.P. und Dobrzynski, W. (1997) Effect of non-uniform rotation on acoustics and aerodynamics of propellers. In: Proceedings 5th International Congress on Sound and Vibration 1997, Vol. II, Seiten 607-614. 5th International Congress on Sound and Vibration, University of Adelaide, South Australia, 15.-18.12.1997..
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Kurzfassung
This numerical study investigates the influence of non-uniform rotation on the aerodynamics and acoustics of multi-blade propellers.Non-uniform rotational motion is inherent to piston engine driven propellers. the effect of rotational speed non-uniformity is the generation of excess harmonic noise due to unsteady aerodynamic blade-loading. In case of mismatch between periodicity of non-uniformity and the basic blade passing frequency, additional harmonics are generated due to the complex blade kinematics. For a periodicity coincidence the effects are masked due to overlapping of the frequencies. The level of such extra harmonics may be high enough to dominate the overall A-weighted noise level. Propeller noise radiation for non-uniform rotation is no longer omnidirectional along azimuth and exhibits also a different characteristic in the polar direction.
| elib-URL des Eintrags: | https://elib.dlr.de/36573/ | ||||||||||||||||
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| Dokumentart: | Konferenzbeitrag (Paper) | ||||||||||||||||
| Zusätzliche Informationen: | LIDO-Berichtsjahr=1997, | ||||||||||||||||
| Titel: | Effect of non-uniform rotation on acoustics and aerodynamics of propellers. | ||||||||||||||||
| Autoren: |
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| Datum: | 1997 | ||||||||||||||||
| Erschienen in: | Proceedings 5th International Congress on Sound and Vibration 1997 | ||||||||||||||||
| Open Access: | Nein | ||||||||||||||||
| Gold Open Access: | Nein | ||||||||||||||||
| In SCOPUS: | Nein | ||||||||||||||||
| In ISI Web of Science: | Nein | ||||||||||||||||
| Band: | Vol. II | ||||||||||||||||
| Seitenbereich: | Seiten 607-614 | ||||||||||||||||
| Status: | veröffentlicht | ||||||||||||||||
| Stichwörter: | Unsteady panel method, aerodynamics of propellers, pressure time history, acoustic spectrum | ||||||||||||||||
| Veranstaltungstitel: | 5th International Congress on Sound and Vibration, University of Adelaide, South Australia, 15.-18.12.1997. | ||||||||||||||||
| HGF - Forschungsbereich: | NICHT SPEZIFIZIERT | ||||||||||||||||
| HGF - Programm: | Luftfahrt | ||||||||||||||||
| HGF - Programmthema: | keine Zuordnung | ||||||||||||||||
| DLR - Schwerpunkt: | NICHT SPEZIFIZIERT | ||||||||||||||||
| DLR - Forschungsgebiet: | L ST - Starrflüglertechnologien | ||||||||||||||||
| DLR - Teilgebiet (Projekt, Vorhaben): | L - Leiser Luftverkehr (alt) | ||||||||||||||||
| Standort: | Köln-Porz , Braunschweig , Göttingen | ||||||||||||||||
| Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Institut für Entwurfsaerodynamik | ||||||||||||||||
| Hinterlegt von: | DLR-Beauftragter, elib | ||||||||||||||||
| Hinterlegt am: | 03 Apr 2006 | ||||||||||||||||
| Letzte Änderung: | 27 Apr 2009 10:06 |
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