AXIAL-FLOW TURBINE Russian patent published in 1998 - IPC

FIELD: driving power generators. SUBSTANCE: turbine has at least one row of curved guide blades and at least one row of rotating blades. Guide blades are converging in radial direction. Their curvature through blade length is perpendicular to chord which is attained due to displacement of airfoil section both in circular and in angular directions. Both entrance and exit edges of guides are arranged in different axial planes. Their curvature is directed to pressure side of adjacent guide blade. Convergence is chosen so that guide blade has rising chord-to-pitch ratio (S/T) from external radius to approximately half the length of blade and consistent S/T ratio from half its height to internal radius. In length, guide blades are twisted while hub is conically opening. EFFECT: reduced secondary loss usually occurring due to deflection of boundary layers on guide blades. 4 cl, 7 dwg