High-pumping fan with ring-mounted bladelets

Details High-pumping fan with ring-mounted bladelets High-pumping fan with ring-mounted bladelets

1997-05-12

1998-09-22

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Axially extending shroud ring or casing

F04D 2938

Patent

active

058105557

ABSTRACT:
A vehicle fan assembly for circulating air to cool an engine. The fan assembly has a central hub; an outer, circumferential ring with an inner surface disposed around the hub; a plurality of blades, each blade having a root connected to the hub, a tip connected to the inner surface of the ring, and a span between the root and the tip, the blades extending generally radially outward from the hub to the ring; and at least one bladelet having a base connected to the inner surface of the ring, a free end, and a span between the base and the free end. Preferably, a plurality of bladelets are disposed alternately with the blades on the inner surface of the ring around the circumference of the ring. The span of each bladelet is about 40% to 50% of the span of the blades. The tips of the blades and the bases of the bladelets are connected to the ring over the full width of the blades and the bladelets, respectively. Finally, each bladelet has a planform with an elliptical profile.

REFERENCES:
patent: 5454695 (1995-10-01), Shah et al.
Bill Gunston, Aircraft of World War 2, p. 194, Published by Crescent Books, New York (1980).

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