Patent ID: 7179058
Filing Date: 2007-02-20
Classification: F01D,F05D,Y10S

Abstract:
1. A cylindrical blade for a range of stagger setting (57 to 67 degrees) and exit subsonic Mach number flows (M 2 <0.9) for axial steam turbines comprising a leading edge and a trailing edge and a pressure face and joining at said trailing and leading edges and an inlet flow angle characterized in that the trailing edge is below a base line by 2.68% of chord length L wherein the base line is a straight line between the furthest upstream point and downstream point of the blade, wherein the curvature of the pressure face has a point of inflection in the area adjacent to said leading edge at 11% of chord length downstream and wherein the curvature at the point of inflection is concave while the curvature downstream of the point of inflection is convex, said leading and trailing edges are defined by circular arcs of diameters d 1 and d 2 , respectively, and wherein the cylindrical blade has a profile thickness (b 4 /L=0.27812) and a maximum thickness (D/L=0.3296).