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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:
AuthorsInstitution or Email of Authors
Dobrzynski, W.UNSPECIFIED
Date:1990
Number of Pages:63
Status:Published
Keywords:Nose-Cone, Self-Noise, In-Flow Microphones
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
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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