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Self-Noise Characteristics of Nose-Cone Protected 1/2"-Microphones.
Dobrzynski, W. (1990) Self-Noise Characteristics of Nose-Cone Protected 1/2"-Microphones. DLR-Interner Bericht. 129-90/45, 63 S.
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Abstract
In order to avoid flow-induced tonal-noise as typically generated at standard B&K nose-cones, NLR developed a new type of nose-cone with different cone-shape and grid cover. Self-noise measurements were conducted in the DLR aeroacoustic behaviour of this design and to comparethe results against those from standard B&K nose-cones. NLR nose-cone self-noise characteristics turn out to be extremely sensitive towards off-axis inflow conditions, i.e. for attitude angles in excess of about 2 deg. Below this 2 deg attitude angle no tones are observed, while at higher microphone axis attitude both tones and excessive broadband noise levels occur.
| Document Type: | Monograph (DLR-Interner Bericht) | ||||
|---|---|---|---|---|---|
| Additional Information: | LIDO-Berichtsjahr=1990, | ||||
| Title: | Self-Noise Characteristics of Nose-Cone Protected 1/2"-Microphones. | ||||
| Authors: |
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| Date: | 1990 | ||||
| Number of Pages: | 63 | ||||
| Status: | Published | ||||
| Keywords: | Nose-Cone, Self-Noise, In-Flow Microphones | ||||
| HGF - Research field: | UNSPECIFIED | ||||
| HGF - Program: | no assignment | ||||
| HGF - Program Themes: | no assignment | ||||
| DLR - Research area: | UNSPECIFIED | ||||
| DLR - Program: | no assignment | ||||
| DLR - Research theme (Project): | L - Turbine Technologies | ||||
| Location: | Köln-Porz , Braunschweig , Göttingen | ||||
| Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik | ||||
| Deposited By: | elib DLR-Beauftragter | ||||
| Deposited On: | 03 Apr 2006 | ||||
| Last Modified: | 27 Apr 2009 10:04 |
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