GENERATION OF INTENSIVE NARROW-BAND
DISTURBANCES IN A FLOW WITH A LARGE-SCALE
HYDRODYNAMIC STRUCTURE

R. K. Karavosov and A. G. Prozorov

UDC 532.526.3; 532.527; 532.559.3

This paper analyzes the reasons for the appearance of 
intensive narrow-band disturbances and self-sustained oscillations 
in a flow with an inhomogeneity on its boundary. It has been shown 
that self-sustained oscillations are due to the formation of large-scale 
cocurrent hydrodynamic systems with vortex structures and acoustic 
feedback. It is supposed that the vortex formed in the zone near the 
edge of the surface generates noise as a result of the involvement 
in the rotary motion of the azimuth-inhomogeneous structure. It is 
noted that self-sustained oscillations can be avoided or suppressed 
by disorganizing the elements of the large-scale hydrodynamic structure.

Branch of the TsAGI: 17 Radio Str., Moscow 105005, Russia; 
email: acoustic@mktsagi.ru. Translated from 
Inzhenerno-Fizicheskii Zhurnal, Vol. 81, No. 4, pp. 682-689, July-August, 2008. 
Original article submitted March 22, 2007; revision submitted October 2, 2007.