EXCITATION OF NARROW-BAND PULSATIONS
IN A SHORT PORTION OF TRANSITION
FROM THE SMALLER DIAMETER OF A PIPE
TO A LARGER DIAMETER AND POSSIBILITIES
OF PREVENTING THEM
V. G. Zasetskii, R. K. Karavosov,
A. G. Prozorov, and L. I. Sokolinskii

UDC 532.526.5;532.556.4;533.697.3;534.6

By using models of the portions of the circuit of 
main gas-compressor stations, data on the frequencies of narrow-band 
pressure pulsations have been obtained; these data demonstrate the 
jet character of flow in divergent channels with angles of opening 
on one side of 12o47' and 23o50'. It has been shown that narrow-band acoustic 
disturbances are generated in the internal flow with large-scale hydrodynamic 
structures. Intense narrow-band pulsations are prevented by a grid 
of internal divergent channels in the transition portion with small 
angles of opening in canals and in excitation of certain disturbances 
upstream of a short divergent channel.

State Unitary Enterprise "State Scientific-Research Center 
of the Central Aerohydrodynamics Institute," Moscow, Russia. 
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 75, No. 1, 
pp. 71-75, January-February, 2002. Original article submitted 
January 29, 2001; revision submitted April 4, 2001.

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