Turbo-machine stage having reduced secondary losses

Details Turbo-machine stage having reduced secondary losses Turbo-machine stage having reduced secondary losses

1991-05-13

1992-12-01

Kwon, John T.

Rotary kinetic fluid motors or pumps

With passage in blade, vane, shaft or rotary distributor...

415116, 415914, F01D 518

Patent

active

051674866

ABSTRACT:
A turbine stage comprising a set of fixed vanes (1) fixed to the stator (3) of the turbine and supporting a diaphragm, followed by a set of moving vanes (8) mounted on a disk (9) which is fixed to the rotor (6) of the turbine, the periphery of the set of moving vanes (8) having seals (10) constituted by a plurality of chambers (11). The disk (9) includes suction orifices (16) opening out into the space between the diaphragm (4) and the disk (9) and disposed in the vicinty of the peripheral portion of the disk (9). The suction orifices (15) are connected by ducts (17) passing through at least some of the moving vanes (8) to outlet orifices (18) which open out in the tips of the vanes (8) downstream from the seals (10) within a chamber (11) thereof. The disturbed flow at the roots of the fixed vanes (2) and the leakage flow between the diaphragm (4) and the rotor (6) are sucked into the orifices (16), thereby improving efficiency.

REFERENCES:
patent: 2945671 (1960-07-01), Petrie
patent: 3051438 (1962-08-01), Roberts et al.
patent: 3904307 (1975-09-01), Dennison
patent: 4335995 (1982-06-01), Riollet et al.
patent: 4761116 (1988-08-01), Braddy et al.
patent: 4830575 (1989-05-01), Bandukwalla
Power, vol. 133, No. 6, Jun. 1989, New York, USA, pp. S4-S5, "Steam Turbines and Auxiliaries".

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