Rotary kinetic fluid motors or pumps – With passage in blade – vane – shaft or rotary distributor...
Patent
1977-11-07
1980-04-22
Hart, Douglas
Rotary kinetic fluid motors or pumps
With passage in blade, vane, shaft or rotary distributor...
60226R, 181206, 415119, F04D 2966
Patent
active
041992954
ABSTRACT:
A device for reducing the noise generated by the blades of at least one r of rotor blades in a turbo-machine by the production of a counter-noise of opposed phase. This is achieved by injection of jets of fluid under pressure through orifices borne by the rotor located near to the periphery of the blades, and the flow of the fluid is modulated at a frequency which is a whole number multiple of the rotational frequency of the rotor shaft. Regulation of phase of the modulated injected fluid is carried out in such a manner that the acoustic waves generated by the injected fluid are substantially in opposition, with respect to phase, to those of the noise to be reduced.
REFERENCES:
patent: 3508838 (1970-04-01), Martenson
patent: 3572960 (1971-03-01), McBride
patent: 3693749 (1972-09-01), Motsinger et al.
patent: 3936215 (1976-02-01), Hoff
patent: 3951566 (1976-04-01), Mattei et al.
patent: 4044203 (1977-08-01), Swinbanks
Andre Pierre A.
Girault Jean-Pierre Y. B.
Raffy Pierre M.
Richter Gerhard
Thevenin Jean-Claude P. H. P.
Hart Douglas
Societe Nationale d'Etude et de Construction de Moteurs d'Aviati
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