Power plants – Reaction motor – Motive fluid principally liquid
Patent
1978-05-25
1980-12-23
Vrablik, John J.
Power plants
Reaction motor
Motive fluid principally liquid
415116, 115 71, B63H 1100, B63H 118
Patent
active
042402514
ABSTRACT:
A propeller nozzle or duct having means for admitting fluid under pressure into the area of cavitation for the purpose of inhibiting bubble formation and implosion to suppress cavitation and reduce cavitation erosion, the means comprising walls forming an annular passage within the nozzle or duct, a passage communicating between the annular passage and the space within the nozzle or duct below the horizontal centerline thereof, and a passage communicating between the annular passage means and an area above the horizontal centerline coincidental with the zone of potential cavitation within the nozzle or duct and positioned substantially in the plane of the propeller such that fluid subjected to an augmented pressure under the influence of the propeller blade below the horizontal center line will be at an incremental pressure above that of the fluid above the horizontal center line to thereby promote the flow of fluid from the former location to the latter location through the passage there communicating to the area of cavitation. In an alternative embodiment fluid within the annular passage is subject to further pressurization from energy means external to the nozzle and propeller.
REFERENCES:
patent: 442615 (1890-12-01), Dock
patent: 2692572 (1954-10-01), Sparling
patent: 3499412 (1970-03-01), Anthes et al.
patent: 3508517 (1970-04-01), Hannan
patent: 3677660 (1972-07-01), Taniguchi et al.
patent: 3899992 (1975-08-01), Fuller
patent: 4003671 (1977-01-01), Huse et al.
Brenner Edward J.
Vrablik John J.
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