Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Axially extending shroud ring or casing
Patent
1991-05-31
1992-11-03
Denion, Thomas E.
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Axially extending shroud ring or casing
416219R, 416223A, 416248, 416500, 416203, B63H 116
Patent
active
051602423
ABSTRACT:
A freestanding mixed tuned taper-twisted steam turbine blade having an X-X axis parallel to a rotor axis, includes a root portion having a root center line defined by a root center line radius, a platform portion connected to the root portion; and an airfoil portion connected to the platform portion and having a leading edge, a trailing edge, a convex section-side surface, a concave pressure-side surface and a profiled tip, the platform portion having a concave edge, a convex edge, a first end in vertical proximity to the leading edge of the airfoil portion and a second end in vertical proximity to the trailing edge of the airfoil portion, the concave edge being sloped towards the root center line radius at a predetermined angle of slope to define an arcuate sloped surface, and having a sloped flat cut-out surface formed at the second end of the platform portion, the flat cut-out surface having the same predetermined angle of slope as the concave edge and sloping towards the X-X axis.
REFERENCES:
patent: 2807435 (1957-09-01), Howlett et al.
patent: 3986793 (1976-10-01), Warner et al.
patent: 4878810 (1989-11-01), Evans
patent: 4919593 (1990-04-01), Brown
patent: 5017091 (1991-05-01), Tran
patent: 5088894 (1992-02-01), Patel
Denion Thomas E.
Westinghouse Electric Corp.
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