RADIAL-AXIAL TURBINE WORKING WHEEL Russian patent published in 1994 - IPC

FIELD: hydraulic engineering. SUBSTANCE: rib 5 is positioned on the side of upper rim 1 in a plane perpendicular to blade leading edge 7 at distance L₁ from the point it mates lower rim 2 which is equal to 0.08-0.1 of the outer diameter of the ring. Distances L₂ and L₁ from ends of rib 6 to rib 5 are equal to half the length and the length of the rib respectively. Distance L₄ at which the ends of ribs 5 and 6 from blade leading edge 7 is 0.006-0.01 of the outer diameter of the wheel. Additional ribs 8 which ends face rim 1 and are positioned in one plane with rim 2 at distance L₅ equal to 0.01-0.02 of the outer diameter of the wheel may be mounted on working surface 4 of each blade Pitch h of ribs 8 is equal to the length of the projection of each rib on this plane. The end of rib 8 located on the side of blade leading edge 7 is spaced from it at distance L₆ equal to 0.06-0.002 of the outer diameter of the wheel. EFFECT: reduced cavitation erosion intensity. 2 cl, 5 dwg