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Active control of fan noise from high-bypass ratio aeroengines: experimental results

Published online by Cambridge University Press:  04 July 2016

L. Enghardt ,
U. Tapken ,
W. Neise ,
P. Schimming ,
R. Maier  and
J. Zillmann
L. Enghardt
Affiliation:
DLR (German Aerospace Research Center), Institute of Propulsion Technology, Department of Turbulence Research, Berlin, Germany
U. Tapken
Affiliation:
DLR (German Aerospace Research Center), Institute of Propulsion Technology, Department of Turbulence Research, Berlin, Germany
W. Neise
Affiliation:
DLR (German Aerospace Research Center), Institute of Propulsion Technology, Department of Turbulence Research, Berlin, Germany
P. Schimming
Affiliation:
DLR, Institute of Propulsion Technology Cologne, Germany
R. Maier
Affiliation:
EADS Corporate Research Center (CRC), Ottobrunn, Germany
J. Zillmann
Affiliation:
EADS Corporate Research Center (CRC), Ottobrunn, Germany
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Abstract

Noise reduction in the inlet of stationary gasturbines or aeroengines is usually achieved by passive absorbers (acoustic liners) the efficiency of which is limited due to the confined length. Higher sound level reductions can be obtained — in particular for the tonal components -by using additionally active noise control techniques (ANC): The rotorspeed-coherent tonal components of the primary sound field are superimposed with an anti-phase sound field which is produced by secondary acoustic sources.

Type
Research Article
Information
The Aeronautical Journal , Volume 106 , Issue 1063 , September 2002 , pp. 501 - 506
Copyright
Copyright © Royal Aeronautical Society 2002 

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