A new microphone array for aeroacoustic measurements in a cryogenic environment
Ahlefeldt, Thomas and Koop, Lars (2010) A new microphone array for aeroacoustic measurements in a cryogenic environment. Journal of Sound and Vibration, Vol. 329 (22), pp. 4818-4819. Elsevier, ScienceDirect. DOI: 10.1016/j.jsv.2010.06.001.
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Measurement techniques based on microphone-arrays are well-known and common practice on scaled models in wind tunnels with closed test section. Usually, full-scale Reynolds numbers are not achieved. To increase the Reynolds number measurements are performed in cryogenic and/or pressurized wind tunnels. At the DLR Institute of Aerodynamics and Flow Technology the microphone array measurement technique was further developed to perform measurements in a cryogenic wind tunnel at temperatures down to 100 K. In order to use a microphone array in a cryogenic environment, coming to grips with cold hardiness and ensuring long term stability of the array fairing and the electronic devices, especially the microphones, are the primary challenge. In a first step measurements of the radiated noise from a single rod configuration have been conducted in the cryogenic wind tunnel DNW-KKK using a prototype microphone array designed for cryogenic environment. Measurements were carried out with a wide range of operational flow parameters. The measured sound radiation results showed a very good agreement with theory and a Reynolds number dependency of the measured and predicted sound power was shown.
|Title:||A new microphone array for aeroacoustic measurements in a cryogenic environment|
|Journal or Publication Title:||Journal of Sound and Vibration|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 4818-4819|
|Series Name:||Aeroacoustic Research in Europe: The CEAS-ASC Report on 2009 Highlights|
|Keywords:||microphone array measurements, closed test section, cryogenic wind tunnel, airframe noise|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L AR - Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Concepts & Integration|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Experimental Methods|
|Deposited By:||Ilka Micknaus|
|Deposited On:||04 Oct 2010 09:55|
|Last Modified:||07 Feb 2013 20:35|
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