To develop jet noise-reduction concepts, it is necessary to understand the physics
underlying the noise-generation process. Decomposition of the sound field into azimuthal
modes is one of the effective experimental methods that allows extracting subtle features of
different types of noise sources. For turbulent flows, the interpretation of the noise analysis
results using the azimuthal decomposition technique was developed by the authors in
previous papers. In the present paper, a generalization of this method allowing the …

DENTIFICATION of noise sources is a formidable problem in aeroacoustics and an essential
step in the development of noise reduction methods. The noise mitigation problem is
particularly acute for modern aircraft engines, which continue to be major contributors to the
overall noise of an aircraft. To develop effective noise reduction techniques, it is necessary
to understand the physics of noise generation mechanisms. One of such methods is
Azimuthal Decomposition Technique (ADT), which was developed at TsAGI and …