Rotor blade damping structure for axial-flow turbine

Details Rotor blade damping structure for axial-flow turbine Rotor blade damping structure for axial-flow turbine

1994-10-11

1996-04-30

Lopez, F. Daniel

Fluid reaction surfaces (i.e., impellers)

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

Axially extending shroud ring or casing

416217, 416222, F01D 522

Patent

active

055119484

ABSTRACT:
In an axial-flow turbine, at least one of front and rear side contact surfaces of shrouds (3a or 3b) of blades (1a or 1b) with respect to the turbine rotational direction is formed at certain angle with respect to a radial line connecting the rotor center and the contact surface. The shroud (3a) of the blade (1a) of a first kind is formed in a trapezoidal shape converging radially outward in cross section taken in a plane perpendicular to the turbine axial direction, and the shroud (3b) of the blade (1b) of a second kind is formed in an inverted trapezoidal shape converging radially inward in the cross section. Further, half of an angle (2.alpha.) between the front and rear side contact surfaces of the shrouds (3a or 3b) is made smaller than a static frictional angle of the contact surface. Since the shroud contact surfaces of two adjacent blades can be kept in pressure contact with each other under all operating conditions, a large dynamic stress reduction and superior damping properties can be obtained without producing excessive initial stresses at the blade airfoil and blade dovetail attachment portion.

REFERENCES:
patent: 2315616 (1943-04-01), Hall
patent: 3734645 (1973-05-01), Strub
patent: 3751182 (1974-09-01), Brown
patent: 3837761 (1974-09-01), Brown
patent: 4451205 (1984-05-01), Honda et al.
patent: 4781532 (1988-11-01), Novacek et al.
patent: 4798520 (1989-01-01), Partington et al.
patent: 4884951 (1989-12-01), Heylan et al.

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