Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Radial flow devices
Patent
1976-05-28
1979-01-23
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Radial flow devices
416238, 416DIG2, B63H 126
Patent
active
041358589
ABSTRACT:
A propeller blade is rotatable about an axis of rotation and has a leading edge and a trailing edge. The blade has a configuration such that for any fixed point on the leading edge of the blade .gamma. has a maximum value of 90.degree., and for any fixed point on the trailing edge .gamma. has a maximum value of Arc cotg[(tg .beta.).sup.3 ] wherein .gamma. is the angle between a radius extending from the axis of rotation to the fixed point and a vector from the fixed point in the direction of rotation of the blade, the vector lying in a plane which is perpendicular to the axis of rotation and which passes through the fixed point. The vector is normal to a section outline formed by the plane passing through the blade. .beta. is the angle between the plane and the chord of a cylindrical profile or corss-section of the blade formed by an imaginary cylinder concentric to the axis of rotation and passing through the fixed point.
REFERENCES:
patent: 870136 (1907-11-01), Shaw
patent: 1019437 (1912-03-01), Draper
patent: 2460902 (1949-02-01), Odor
patent: 2468723 (1949-04-01), Bartlett
patent: 2667936 (1954-02-01), Clark
patent: 3367423 (1968-02-01), VanRanst
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