Over-cambered stage design for steam turbines

Details Over-cambered stage design for steam turbines Over-cambered stage design for steam turbines

1993-08-27

1994-07-05

Look, Edward K.

Rotary kinetic fluid motors or pumps

Working fluid passage or distributing means associated with...

Plural distributing means immediately upstream of runner

415181, 416223A, F01D 902, F01D 514

Patent

active

053262212

ABSTRACT:
Steam turbine nozzle blades and buckets are profiled in accordance with Tables I and II or multiples of the X,Y and R coordinates of the charts. The profiles of the nozzle blades impose a parabolic flow distribution at the throat and the buckets accommodate the incoming flow. The nozzle blades and buckets are over-cambered at their roots and tips to constrict flow from the roots and tips into the mid-regions of the blades and buckets. Improved aerodynamic efficiencies are obtained by directing the flow away from the end walls of the blades and buckets toward the efficient mid-region of the blades and buckets whereby flow velocity and angle leaving the nozzle has a non-linear distribution and the bucket velocity leaving angles are similarly non-linear.

REFERENCES:
patent: 2795373 (1957-06-01), Hewson
patent: 3953148 (1976-04-01), Seippel et al.
patent: 4208167 (1980-06-01), Yasugahira et al.
patent: 4616975 (1986-10-01), Duncan
patent: 4696621 (1987-09-01), Hamblett et al.
patent: 4741667 (1988-05-01), Price et al.

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