Compressor range improvement means

Details Compressor range improvement means Compressor range improvement means

1986-07-28

1988-11-01

Hershkovitz, Abraham

Rotary kinetic fluid motors or pumps

Bearing, seal, or liner between runner portion and static part

415 53R, 415DIG1, F04D 2944

Patent

active

047815302

ABSTRACT:
A compressor having either an axial or radial stage adjacent the air inlet includes a circumferential row of slots in the inner casing wall, the slots opening into the casing bore; a rotor having a leading row of compressor blades thereon rotatable within the bore with the tips of the blades adjacent the row of slots; and, the axial centerline of the circumferential row of slots being positioned axially forward of the axial centerline of the blades of the leading blade row with a substantial portion of the axial slot length of each slot being forward of the leading edge of the blades of the leading blade row. In a preferred form of the compressor, the inner casing wall includes a circumferential stationary ring having an inner wall for defining with the inner casing wall the bore in which the rotor rotates, the circumferential row of slots being formed in the ring wall.

REFERENCES:
patent: 3893782 (1975-07-01), Pierpoline et al.
patent: 4063742 (1977-12-01), Watkins, Jr.
patent: 4086022 (1978-04-01), Freeman et al.
patent: 4116584 (1978-09-01), Bammert et al.
patent: 4212585 (1980-07-01), Swarden et al.
patent: 4466772 (1984-08-01), Okapuu et al.
patent: 4540335 (1985-09-01), Yamaguchi et al.
Wenzel et al., "Effect of Casing Treatment on Performance of a Multistage Compressor", Jan. 1975; (NASA).
Takata et al., "Study on the Mechanism of Stall Margin Improvement of Casing Treatment", Nov. 22, 1974; (ASME).
Horlock et al., "Propagating Stall in Compressors With Porous Walls", Dec. 2, 1974; (ASME).
Fabri et al., "Effect of Outer Casing Treatment and Tip Clearance on Stall Margin of a Supersonic Rotating Cascase", Dec. 2, 1974; (ASME).
Holman et al., "Effects of Casing Treatment on a Small, Transonic Axial-Flow Compressor", Jul. 23, 1975; (ASME).

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