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Gehlhar, B. and Dobrzynski, W. (1990) Azimuthal Noise Characteristics of Contra-Rotating Propellers: Results of a Wind Tunnel Model Test. Inter-Noise '90, 13-15 August 1990, Göteborg.
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Abstract
Compared to conventional turbofan engines, advanced high speed coaxial/contra-rotating ("CR") propellers promise significant fuel savings. Their noise characteristics, however, differ from those of singe-rotating ("SR") propellers as a consequence of the unavoidable acoustic interaction effects; additional noise is generated by aerodynamic interactions. In the context of an acoustic research program to support the development of future CR-propfans, pilot-type aerodynamic wind tunnel tests on contrarotating model-scale propellers (diameter 0,27 m)were conducted. It was found that, compared to SR-propellers, the noise radiated from CR-propellers exhibits the following specific characteristics: o increased sound pressure levels at higher frequencies, o pronounced azimuthal sound pressure level directivity, o two maxima in the polar directivities of both the high-frequency ha rmonic and the A-weighted levels, o a lower gradient of A-weighted sound pressure levels versus Mach number.
| Item URL in elib: | https://elib.dlr.de/35784/ | |||||||||
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| Document Type: | Conference or Workshop Item (Paper) | |||||||||
| Additional Information: | LIDO-Berichtsjahr=1990, pages=4, | |||||||||
| Title: | Azimuthal Noise Characteristics of Contra-Rotating Propellers: Results of a Wind Tunnel Model Test. | |||||||||
| Authors: |
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| Date: | 1990 | |||||||||
| Open Access: | No | |||||||||
| Gold Open Access: | No | |||||||||
| In SCOPUS: | No | |||||||||
| In ISI Web of Science: | No | |||||||||
| Page Range: | pp. 471-475 | |||||||||
| Status: | Published | |||||||||
| Keywords: | Propeller Noise, Counter Rotating Propeller Noise | |||||||||
| Event Title: | Inter-Noise '90, 13-15 August 1990, Göteborg | |||||||||
| HGF - Research field: | UNSPECIFIED | |||||||||
| HGF - Program: | other | |||||||||
| HGF - Program Themes: | other | |||||||||
| DLR - Research area: | UNSPECIFIED | |||||||||
| DLR - Program: | no assignment | |||||||||
| DLR - Research theme (Project): | L - Turbine Technologies (old) | |||||||||
| Location: | Köln-Porz , Braunschweig , Göttingen | |||||||||
| Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik | |||||||||
| Deposited By: | DLR-Beauftragter, elib | |||||||||
| Deposited On: | 03 Apr 2006 | |||||||||
| Last Modified: | 27 Apr 2009 10:04 |
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