CN-115962485-B - Attachment of burner swirler to dome

CN115962485BCN 115962485 BCN115962485 BCN 115962485BCN-115962485-B

Abstract

A combustor for a gas turbine includes a Ceramic Matrix Composite (CMC) dome including a swirler opening therethrough having a flared interface surface surrounding the swirler opening, a swirler assembly including (a) a secondary swirler having a threaded flared attachment portion and (b) a flare having (i) a threaded secondary swirler attachment portion, and (ii) a dome interface wall that interfaces with the flared interface surface of the CMC dome, and a swirler dome attachment member. The flare is connected to the secondary swirler via a threaded flare attachment portion and a threaded secondary swirler attachment portion, and the swirler dome attachment member applies a force to the CMC dome to engage the dome interface wall and the flare interface surface to connect the CMC dome and the swirler assembly.

Inventors

Jerado Antonio Salazar Louis
NICHOLAS JOHN BLOOM
Daniel J. cotley
Shay bill maher
Ryan Christopher Jones

Assignees

通用电气公司

Dates

Publication Date: 20260512
Application Date: 20220926
Priority Date: 20211012

Claims (10)

1. A combustor for a gas turbine, the combustor comprising: A Ceramic Matrix Composite (CMC) dome comprising a swirler opening therethrough, having a flared interface surface surrounding the swirler opening on an upstream surface of the CMC dome, the CMC dome further comprising a swirler mounting wall disposed on an upstream side of the CMC dome and extending circumferentially about a centerline axis of the swirler opening, the swirler mounting wall having a second swirler opening therethrough, an annular cavity being defined between the upstream surface of the CMC dome and a downstream surface of the swirler mounting wall; A cyclone assembly comprising (a) a primary cyclone, (b) a secondary cyclone having a threaded flared attachment portion and (c) a flare having (i) a threaded secondary cyclone attachment portion, (ii) a dome interface wall that interfaces with the flared interface surface of the CMC dome, (iii) a threaded cyclone dome attachment member portion; A cyclone dome attachment member comprising a threaded flared attachment portion and an attachment wall, Wherein the flared mouth of the swirler dome attachment member and the dome interface wall of the attachment wall are disposed within the annular cavity and the swirler dome attachment member is in threaded engagement with the threaded swirler attachment member portion of the flared mouth so as to engage the dome interface wall of the flared mouth with the flared mouth surface of the CMC dome and apply a first axial force therebetween and so as to engage the attachment wall of the swirler dome attachment member with a downstream surface of the swirler mounting wall and apply a second axial force therebetween.
2. The burner of claim 1, wherein the swirler mounting wall is integrally formed with the CMC dome.
3. The burner of claim 1, wherein the flare includes an annular flare axial wall extending circumferentially about the centerline axis of the swirler opening, the threaded secondary swirler attachment portion being disposed on an inner surface of the annular flare axial wall, the annular flare axial wall further including a threaded swirler dome attachment member portion disposed on an outer surface of the annular flare axial wall.
4. A burner according to claim 3, wherein the swirler dome attachment member comprises an attachment member annular axial wall extending circumferentially about the centerline axis of the swirler opening and including the threaded flare engagement portion on an inner surface thereof.
5. The burner of claim 4 wherein the attachment wall extends radially outwardly from a downstream end of the attachment member annular axial wall, the attachment wall including a plurality of attachment member slots therethrough.
6. The combustor of claim 5, wherein the dome interface wall includes a plurality of interface wall slots therethrough and the swirler mounting wall of the CMC dome includes a plurality of mounting wall slots therethrough.
7. The burner of claim 1, wherein the first axial force and the second axial force are in opposite directions from each other.
8. The burner of claim 6 wherein during assembly, the threaded flare engagement portion of the cyclone dome attachment member and the threaded cyclone dome attachment member portion of the flare are threadably engaged with each other, The plurality of interface wall slots and the plurality of attachment member slots of the dome interface wall are aligned, and the dome interface wall and the attachment wall are joined together by the plurality of mounting wall slots, such that the dome interface wall and the attachment wall of the cyclone dome attachment member are disposed within the annular cavity, The cyclone dome attachment member rotates such that an upstream surface of the attachment wall engages the downstream surface of the cyclone mounting wall, and While limiting rotation of the swirler dome attachment member, the flare rotates about the centerline axis of the swirler opening to expand the distance between the attachment wall and the dome interface wall to provide a predetermined compressive force between the swirler dome attachment member and the swirler mounting wall and between the dome interface wall and the upstream surface of the CMC dome.
9. The combustor of claim 6, further comprising an anti-rotation retainer having a plurality of retaining posts extending axially therefrom, the plurality of retaining posts engaged by respective ones of the plurality of mounting wall slots to retain the swirler dome attachment member with the CMC dome.
10. The burner of claim 9, wherein the anti-rotation retainer includes an annular disk extending circumferentially about the centerline axis of the swirler opening, and the plurality of retaining posts extend from the annular disk in a downstream direction.

Description

Attachment of burner swirler to dome Technical Field The present disclosure relates to a combustor swirler coupled to a CMC (ceramic matrix composite) dome in a gas turbine engine. Background Some conventional gas turbine engines are known to include a rich burner that typically uses a metal swirler assembly coupled to a metal dome structure. It is known that metal dome structures comprise a deflector wall on the combustion chamber side of the dome, wherein the deflector wall deflects heat generated in the burner during combustion. The cooling holes typically pass through the dome structure to provide some surface cooling of the dome and the guide wall. The metal swirler assembly is typically brazed or welded to the dome structure. Drawings Features and advantages of the present disclosure will be apparent from the following description of various exemplary embodiments, as illustrated in the accompanying drawings, in which like reference numbers generally indicate identical, functionally similar, and/or structurally similar elements. FIG. 1 is a schematic partial cross-sectional side view of an exemplary high bypass turbofan jet engine according to aspects of the present disclosure. FIG. 2 is a partial cross-sectional side view of an exemplary combustor in accordance with aspects of the present disclosure. FIG. 3 is a partial cross-sectional side view of an exemplary CMC dome structure in accordance with aspects of the present disclosure. FIG. 4 is a partial cross-sectional side view of the connection of the swirler to the CMC dome taken at detail view 122 of FIG. 2 in accordance with aspects of the present disclosure. Fig. 5 is an enlarged front-rear partial cut-away perspective view of a dome-flare-spacer arrangement according to aspects of the present disclosure. FIG. 6 is a front-rear perspective view of a swirler assembly and CMC dome connection in accordance with aspects of the present disclosure. FIG. 7 is a partial cross-sectional side view of an exemplary CMC dome structure in accordance with another aspect of the present disclosure. FIG. 8 is a cross-section of a cyclone mounting wall taken at plane 8-8 of FIG. 7 in accordance with aspects of the present disclosure. Fig. 9 is a partial cross-sectional side view of a connection of a swirler to a CMC dome taken at detail view 122 of fig. 2 according to another aspect of the disclosure. Fig. 10 is a cross-section of a dome interface wall taken at plane 10-10 of fig. 9, in accordance with an aspect of the present disclosure. FIG. 11 is a cross-section of the downstream attachment wall taken at plane 11-11 of FIG. 9, in accordance with aspects of the present disclosure. Fig. 12 is an enlarged front-to-rear perspective view of dome and flare insertion according to aspects of the present disclosure. Fig. 13 is an enlarged front-rear perspective view of a connection of a cyclone to a dome in accordance with an aspect of the disclosure. Detailed Description The features, advantages, and embodiments of the present disclosure are set forth or apparent from consideration of the following detailed description, drawings, and claims. Moreover, it should be understood that the following detailed description is exemplary and intended to provide further explanation without limiting the scope of the disclosure as claimed. Various embodiments are discussed in detail below. Although specific embodiments are discussed, this is for illustrative purposes only. One skilled in the relevant art will recognize that other components and configurations may be used without departing from the spirit and scope of the disclosure. As used herein, the terms "first," "second," and "third" may be used interchangeably to distinguish one component from another and are not intended to represent the location or importance of the respective components. The terms "upstream" and "downstream" refer to relative directions with respect to fluid flow in a fluid path. For example, "upstream" refers to the direction from which fluid flows and "downstream" refers to the direction in which fluid flows. It is becoming increasingly common to implement nonmetallic materials in combustors. In particular, rather than utilizing a conventional metal dome, implementations of Ceramic Matrix Composite (CMC) materials may be used to form the dome. CMC materials have better thermal properties than conventional metallic materials, and therefore, less cooling is required for CMC domes than for conventional metallic domes. Less cooling required for the dome means more air is available for other purposes, including use as dilution air. Furthermore, the CMC dome structure does not require a guide wall, thereby reducing the overall axial length of the dome, which also reduces the length of the combustor module. However, implementing CMC domes with metal swirlers presents challenges to the ability to connect the metal swirlers to the CMC domes. The present disclosure provides a threaded sandwich connection between the