Arrangement for clipping stress peaks in a turbine blade root

Details Arrangement for clipping stress peaks in a turbine blade root Arrangement for clipping stress peaks in a turbine blade root

1995-09-22

1996-10-22

Larson, James

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Blade received in well or slot

F01D 530

Patent

active

055671160

ABSTRACT:
An arrangement for clipping stress peaks in the anchoring of a turbine blade including a root that is shaped like a Christmas tree, that includes tangs, and that is received in a correspondingly-shaped groove in a disk so as to anchor the blade thereto, wherein the outline of each tang, on the extrados side of the blade root, is such that the clearance for mounting the root in its groove, on the extrados side, is not uniform but rather it includes at least one zone in which the clearance varies, the zone corresponding to a zone of the tang in question where, if the disk-and-blade assembly were rotating at its rated speed of rotation, there would otherwise occur a stress peak relative to the mean stress along the tang if the blade were mounted with constant clearance along the entire length of the tang, the varying clearance varying along the at least one zone with the same sign as the stress peak.

REFERENCES:
patent: 5110262 (1992-05-01), Evans
patent: 5141401 (1992-08-01), Juenger et al.

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