Abstract:
A gas turbine engine blade root shim includes a dovetail shim portion with a dovetail shape and a longitudinally extending substantially flat base (52) and distal first and second longitudinally spaced apart forward and aft ends (72 and 76). Transversely spaced apart first and second walls (54 and 64) extend upwardly from the base (52) which includes at least two longitudinally extending elongated base apertures (90). Each of the base apertures (90) includes a main region (92) and longitudinally spaced apart rounded end regions (94). Dog-bone-shaped base apertures or rounded end base apertures having semi-circular rounded end regions may be used. The shim is designed for a blade dovetail root with a root slot formed in a bottom of the dovetail root. The dovetail shim portion with the dovetail shape substantially conforms to at least a portion of a cross-sectional dovetail shape of the dovetail root through the root slot. The base (52) is disposed within the root slot.
Abstract:
A gas turbine engine blade root shim includes a dovetail shim portion with a dovetail shape and a longitudinally extending substantially flat base (52) and distal first and second longitudinally spaced apart forward and aft ends (72 and 76). Transversely spaced apart first and second walls (54 and 64) extend upwardly from the base (52) which includes at least two longitudinally extending elongated base apertures (90). Each of the base apertures (90) includes a main region (92) and longitudinally spaced apart rounded end regions (94). Dog-bone-shaped base apertures or rounded end base apertures having semi-circular rounded end regions may be used. The shim is designed for a blade dovetail root with a root slot formed in a bottom of the dovetail root. The dovetail shim portion with the dovetail shape substantially conforms to at least a portion of a cross-sectional dovetail shape of the dovetail root through the root slot. The base (52) is disposed within the root slot.
Abstract:
An exemplary embodiment of the invention is a gas turbine engine blade spacer has an axially extending backbone (300), spaced apart forward, mid and aft dovetail lands (302, 304 and 308), respectively, disposed along the backbone, the backbone (300) and the forward, mid, and aft dovetail lands (302, 304 and 308) having bottom curved backbone surfaces (310). Each of the forward, mid and aft dovetail lands has a riser (312) that extends above the backbone (300) and has a riser flat top (314). In the exemplary embodiment disclosed herein, a spacer tab (320) extends generally axially forward of the forward land (302) and includes intersecting axially and radially extending tab apertures (316 and 318). A void (330) extends around the backbone (300) and between the forward and aft dovetail lands (302 and 308) and the void filled with an elastomeric material (332). The spacer has a constant shape and size cross-section between the forward and aft dovetail lands. The invention has a particular use with circular arc dovetail slots and roots for which the spacer is a circular arc shaped spacer and the backbone (300), and the forward, mid and aft dovetail lands (302, 304 and 308) are curved along a circular arc normal to and about a radial axis (RA). The spacer tab (320) has a rectangular cross-section (321), extends axially out of a forward face (322) of the forward land (302), and has a tab flat top (324) that is co-planar with the riser flat tops (314) of the risers (312).
Abstract:
A gas turbine engine rotor disk (16) has a number of annular hubs (64) circumscribed about a centerline and each of the hubs is connected to a disk rim by a web (68). A plurality of circumferentially spaced apart dovetail slots are disposed through the rim (62), extending circumferentially between disk posts (50), extending axially from a forward end (65) to an aft end (67) of the rim, and extending radially inwardly from a disk outer surface (63) of the rim. Circumferentially extending annular burst slots (70) extend radially through the rim (62) into the dovetail slots between each adjacent pair (72) of the webs (68). In the exemplary embodiment of the invention illustrated herein, the dovetail slots are circular arc dovetail slots. An axially forwardly extending overhang (69) is located radially outwardly on each of the disk posts (50) and a chamfer (39) is on a radially outer corner (45) of the each of the disk posts (50) on a portion of the overhangs (69). A plurality of post holes extending axially aftwardly into the rim (62) wherein each of the post hole extends axially aftwardly into a corresponding one of the disk posts (50).
Abstract:
A gas turbine engine rotor disk (16) has a number of annular hubs (64) circumscribed about a centerline and each of the hubs is connected to a disk rim by a web (68). A plurality of circumferentially spaced apart dovetail slots are disposed through the rim (62), extending circumferentially between disk posts (50), extending axially from a forward end (65) to an aft end (67) of the rim, and extending radially inwardly from a disk outer surface (63) of the rim. Circumferentially extending annular burst slots (70) extend radially through the rim (62) into the dovetail slots between each adjacent pair (72) of the webs (68). In the exemplary embodiment of the invention illustrated herein, the dovetail slots are circular arc dovetail slots. An axially forwardly extending overhang (69) is located radially outwardly on each of the disk posts (50) and a chamfer (39) is on a radially outer corner (45) of the each of the disk posts (50) on a portion of the overhangs (69). A plurality of post holes extending axially aftwardly into the rim (62) wherein each of the post hole extends axially aftwardly into a corresponding one of the disk posts (50).
Abstract:
A double annular combustor having concentrically disposed inner and outer annular combustors including an inner dome having an inner portion and an outer portion (28), an outer dome having an inner portion and an outer portion (25), wherein the outer dome inner portion (25) is connected to the inner dome outer portion (28), and a substantially annular centerbody (50) disposed between the inner dome and the outer dome. The centerbody includes a plurality of structurally independent arcuate segments (51), wherein each centerbody segment is retained in position via an interference fit between a first flange (59) of such centerbody extending downstream and a hook (58) in the inner dome outer portion and/or via a clamping fit of a second flange of the centerbody extending upstream to a flange of the inner dome outer portion.