Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices
Patent
1981-07-24
1985-05-28
Coe, Philip R.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Radial flow devices
416237, B64C 1118
Patent
active
045197466
ABSTRACT:
An improved airfoil blade for aircraft propellers and the like which exhibits high aerodynamic performance and low far and near field noise levels at a minimum weight is provided with a novel high lift and high lift to drag cross-sectional airfoil shape characterized by a blunt, generally parabolic leading edge portion (10) which fairs into a pressure surface (15) characterized by a leading convex portion (20). For thickness ratios less than approximately 0.15, the pressure surface includes a concave trailing portion (25) at one end thereof, fairing into the leading convex portion (20) and at the other end thereof, terminating at a blunt trailing edge (35). The leading edge portion also fairs into a suction surface (30) which is convex along substantially the entire length thereof to the blade trailing edge.
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Rohrbach Carl
Wainauski Harry S.
Coe Philip R.
Peterson Christine A.
Swiatocha John
United Technologies Corporation
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