A new modular fan rig noise test and radial mode detection capability
Tapken, U. and Bauers, R. and Neuhaus, L. and Humphreys, N. and Wilson, A. and Stöhr, Chr. and Beutke, M. (2011) A new modular fan rig noise test and radial mode detection capability. In: Proceedings 17th AIAA / CEAS Aeroacoustics Conference (32nd Aeroacoustics Conference). AIAA. 17th AIAA / CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference), 05.06. - 08.06.2011, Portland, USA.
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A new major large-scale fan rig test facility, UFFA (Universal Fan Facility for Acoustic), has been designed with the objective to allow test bed changes for engine representative OGVs and bypass duct annulus and liners, for reduced build times, and higher fidelity investigation of aft fan noise technologies. An important enhancement consisted in the implementation of three Radial Mode Detection (RMD) devices in the bypass duct and further downstream in the nozzle equivalent plane. High effort was spend on the realisation of a wall-flush mounted sensor array, which has the advantage not to disturb the flow and the acoustic field. However, the separation of different radial mode contributions is realised only implicitly by the analysis of the axial wave number spectrum, which is particularly challenging if sensors are installed only at the outer duct wall. More robust from the numerical point of view is the established technique to directly measure the radial structure of the sound field with sensor rakes. It is one of the main objectives of this paper to verify whether both techniques deliver the same experimental results also at the high targeted frequencies up to kR=75. As the examination of recently obtained data revealed, the sensor rake measurements were influenced by aerodynamic perturbations originating from the fan rotor wakes. The radial mode analysis could be significantly improved by incorporation of appropriate aerodynamic eigenfunctions. Further investigated was the sensitivity of mode detection with sensor rakes against manufacturing and installation tolerances.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||A new modular fan rig noise test and radial mode detection capability|
|Journal or Publication Title:||Proceedings 17th AIAA / CEAS Aeroacoustics Conference (32nd Aeroacoustics Conference)|
|In ISI Web of Science:||No|
|Keywords:||turbo machinery, fan noise, aeroacoustics, noise source identification, duct acoustics, advanced measurement technique|
|Event Title:||17th AIAA / CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference)|
|Event Location:||Portland, USA|
|Event Type:||international Conference|
|Event Dates:||05.06. - 08.06.2011|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L ER - Engine Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L ER - Engine Research|
|DLR - Research theme (Project):||L - Turbine Technologies|
|Institutes and Institutions:||Institute of Propulsion Technology > Engine Acoustic|
|Deposited By:||Balbir Kaur|
|Deposited On:||20 Jan 2012 12:19|
|Last Modified:||09 Feb 2012 15:40|
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