Experimental methods in compressor noise studies
Abstract
Resolution of sound wave equations in a guided medium, cut off properties of ducts, and azimuthal modes generated by a rotating source are discussed. Sound emission upstream of a compressor at subsonic and transonic speeds is compared. Ground-based and in flight measurement of compressor noise is described. A method of determining the spectrum of azimuthal or axial wave numbers by deriving the mean product of two signals filtered on a pure tone, one of which comes from a fixed microphone, and the other from a moving probe is illustrated.
- Publication:
-
In Von Karman Inst. for Fluid Dynamics Aeroacoustics: Ten Years of Res. 37 p (SEE N84-15025 06-01
- Pub Date:
- 1983
- Bibcode:
- 1983atyr.vkifR....L
- Keywords:
-
- Engine Noise;
- Turbocompressors;
- Turbojet Engines;
- Acoustic Propagation;
- Aeroacoustics;
- Compressor Rotors;
- Flight Tests;
- Transonic Compressors;
- Wind Tunnel Tests;
- Acoustics