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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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)|
|Title:||Self-Noise Characteristics of Nose-Cone Protected 1/2"-Microphones.|
|Number of Pages:||63|
|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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