Patent ID: 7175393

Claim:
A set of six transonic blade profiles comprising each a pressure face and a suction face joined at their leading and trailing edges, the cross sections being twisted over the blade height and that the centers of gravity of these sections lie in a radial line, the profile pitching and setting are as follows: Profile 1: s/c=0.5–0.8, gamatg=65–75 deg; Profile 2: s/c=0.5–0.8, gamatg=60–70 deg; Profile 3: s/c=0.5–0.8, gamatg=60–70 deg; Profile 4: s/c=0.5–0.8, gamatg=55–65 deg; Profile 5: s/c=0.6–0.9, gamatg=40–50 deg; and Profile 6: s/c=0.8–1.1, gamatg=25–35 deg, wherein gamatg is the stagger angle and s/c is the pitch to chord ratio wherein outlet flow Mach number is 0.8–1.1, and wherein the blade profiles are equally spaced over the blade height and Profile 1 is at a hub or root (zero height), Profile 6 is at a tip and the remaining Profiles 2, 3, 4, and 5 are at intermediate heights of the blade.