WATER-JET PROPELLER Russian patent published in 2005 - IPC

FIELD: water-jet propellers.

SUBSTANCE: proposed water-jet propeller includes water duct, impeller mounted on propeller shaft and enclosed in shell; hub of this impeller is made in form of body of revolution at lesser diameter at impeller inlet as compared with diameter at impeller outlet; impeller blades have curvilinear profile in cylindrical sections. Diameters of hub and water duct at inlet and outlet sections of blade system are selected from the following condition: where F_in and F_out are areas of hydraulic section of flow part bounded by hub and water duct walls at inlet and outlet of blade system; α_in.tang. and α_out.tang. are angles of inclination to plane of impeller disk which are tangential to center line of profile of blade cylindrical section passed through leading and trailing edges of blade. Such construction of propeller excludes abrupt reduction of thrust at development of cavitation on impeller blades and ensures stable operation at entrained air in hydraulic section of impeller.

EFFECT: enhanced efficiency.

4 dwg