A.O.Borisyuk
Sound generation by a limited region of disturbed flow in a rigid channel with circular cross-section. Part 2. Partial cases

Acoustic bulletin, Vol. 7 4, (2004) p.10-20
Partial cases of the theory of noise generation by a limited region of a disturbed flow in an infinite straight rigid channel with circular cross-section, which has been developed earlier, are considered. In these cases the situations are studied when the contributions either from volume quadrupoles or surface dipoles dominate in generated acoustic field. Those flows and shapes of the channel local geometrical inhomogeneities are of interest, that result in large or small eddies are distributed uniformly in the disturbed flow region past the inhomogeneity. The corresponding simplified expressions for the acoustic power generated are obtained in the considered cases, and their estimates are carried out for the characteristic scales in the disturbed flow region.
KEY WORDS:
noise generation by a limited region of a disturbed flow, infinite straight rigid channel with circular cross-section, volume quadrupoles,surface dipoles
TEXT LANGUAGE: Ukrainian