Rotary kinetic fluid motors or pumps – With sound or vibratory wave absorbing or preventing means...
Patent
1980-07-18
1983-12-06
Hornsby, Harvey C.
Rotary kinetic fluid motors or pumps
With sound or vibratory wave absorbing or preventing means...
415DIG1, 415 11, 415181, F04D 2966
Patent
active
044190450
ABSTRACT:
A method and device for reducing the noise produced in a turbo-machine by e interaction of the blades of a ring of rotor blades and the vanes of a ring of stator vanes, by the creation of a counter-noise of opposed phase. This is achieved by the injection of a fluid into the flow passage of the machine in which the blades and vanes are located. The injection is carried out through orifices located on stationary parts of the machine and equal in number to the vanes of ring of stator vanes, the flow through the orifices being modulated at the frequency of the noise to be reduced and with a phase difference which increase in an incremental manner from one orifice to the next. The phase of the modulated flows injected through the orifices is simultaneously regulated so that the acoustic waves created by the flows are substantially in opposition, with respect to phase, to those of the noise to be reduced.
REFERENCES:
patent: 3470892 (1969-10-01), Barker
patent: 3572960 (1971-03-01), McBride
patent: 3936606 (1976-02-01), Wanke
patent: 3951566 (1976-04-01), Mattei et al.
patent: 4034558 (1977-07-01), Korta et al.
patent: 4044203 (1977-08-01), Swinbanks
patent: 4199295 (1980-04-01), Raffy et al.
Andre Pierre A.
Girault Jean-Pierre Y. B.
Richter Gerhard
Thevenin Jean-Claude P. H. P.
Hornsby Harvey C.
Peterson Christine A.
Societe Nationale d'Etude et de Construction de Moteurs d'Aviati
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