METHOD OF ENHANCING OPERATIONAL EFFICIENCY OF BLADE (VERSIONS) Russian patent published in 2006 - IPC F04D29/68 F04D29/30 F04D29/38 B64C21/06 

FIELD: mechanical engineering; bladed machines for supercharging air; propeller blades.

SUBSTANCE: proposed method consists in making blade in form of wing; air of boundary layer is sucked from surface on side opposite to incoming flow through series of slotted holes. Blades have thick aerodynamic profile; suction of air is effected through series of slotted holes made along blade; air is directed to cavities found under said holes with central longitudinal hollow body in each of them forming circular passage in each cavity and vortex-type flow caused by incoming flow of air. Air from cavities and from central body is sucked through discharge passages wherefrom it is evacuated beyond blades. Runoff of air flow along cavity and along blade is limited due to partitions mounted inside cavity and fins mounted on external surface of blade. According to another version, cavities are made without central body.

EFFECT: enhanced operational efficiency.

8 cl, 4 dwg