Rotating rake turbofan duct mode measurement system | Zendy

Daniel L. Sutliff | Zendy

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Rotating rake turbofan duct mode measurement system

Author(s) -

Daniel L. Sutliff

Publication year - 2005

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 187

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.4779000

Subject(s) - turbofan , duct (anatomy) , rake , acoustics , microphone , computer science , aerospace engineering , physics , engineering , mechanical engineering , sound pressure , medicine , pathology

An experimental measurement system was developed and implemented by the NASA Glenn Research Center in the 1990s to measure turbofan duct acoustic modes. The system is a continuously rotating radial microphone rake that is inserted into the duct. This rotating rake provides a complete map of the acoustic duct modes present in a ducted fan and has been used on a variety of test articles: from a low‐speed, concept test rig, to a full‐scale production turbofan engine. The rotating rake has been critical in developing and evaluating a number of noise reduction concepts as well as providing experimental databases for verification of several aero‐acoustic codes.

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