Combustor dome and heat-shield assembly
A combustor dome and heat-shield assembly comprises a heat-shield having a first opening therethrough. A swirler extends through the first opening and captures the heat-shield. A dome having a second opening therethrough and has an upstream side and a downstream side. The swirler extends through the second opening from the downstream side to the upstream side to capture the heat-shield on the downstream side, and a retaining clip engages the swirler to secure the swirler and the heat-shield on the dome.
1. A combustor dome and heat-shield assembly comprising:
a heat-shield having a first opening therethrough and having a first plurality of securing projections;
a swirler extending through the first opening and capturing the heat-shield, the swirler comprising a first peripheral axial slot;
a combustor dome having a second opening therethrough and having an upstream surface and a downstream surface, wherein the combustor dome comprises a second plurality of slots, each of the plurality of slots for receiving one of the first plurality of securing projections, the swirler extending through the second opening from the downstream surface to the upstream surface to capture the heat-shield on the downstream surface;
wherein the second opening comprises a first inwardly extending projection that engages the first peripheral slot to prevent rotation of the swirler; and
a retaining clip, distinct from the heat shield and the combustor dome, that engages the swirler to secure the swirler and the heat-shield on the combustor dome.
2. The assembly according to claim 1 wherein the heat-shield is a stamped heat-shield.
3. The assembly according to claim 2 further comprising a thermal barrier coating on the downstream surface of the stamped heat-shield.
4. The assembly according to claim 3 wherein the heat-shield is stamped from a high-temperature nickel alloy.
5. The assembly according to claim 3 wherein the thermal barrier coating is a ceramic.
6. The assembly according to claim 1 wherein the retaining clip is a split ring.
7. The assembly according the claim 1 wherein the swirler comprises an annular slot and an annular abutment downstream of the annular slot for capturing the retaining clip in the slot to secure the combustor dome and the heat-shield between the retaining clip and the annular abutment.
8. The assembly according to claim 7 further comprising:
a mouth portion configured to receive fuel therein; and
a radial flange coupled to the swirler downstream of the mouth portion.
9. The assembly according the claim 8 further comprising a vane cover having a radial section coupled to an upstream portion of the swirler and an outboard axial section that extends upstream.
10. The assembly according to claim 9 further comprising a radially extending bellmouth retainer having an end coupled to the radial section of the vane cover forming a slot with the radial section of the vane cover to slidably retain the bellmouth flange therebetween.
11. The assembly according to claim 10 wherein the vane cover is attached to the swirler by brazing.
12. The assembly according to claim 11 wherein the vane cover is coupled to the bellmouth retainer by welding.
13. A method for securing a heat-shield to a downstream surface of a combustor dome in a combustor dome assembly, comprising:
providing a swirler having an annular upstream groove and a downstream annular abutment;
capturing the heat-shield having a first annular opening therethrough by passing the swirler through the first annular opening such that the downstream edge of the first annular opening is captured by an upstream surface of the abutment;
passing the swirler through a second annular opening in the combustor dome of the combustor dome assembly to capture the heat-shield against the downstream surface of the combustor dome; and
securing the swirler with a retaining clip, distinct from the heat shield, that engages the annular upstream groove to secure the heat-shield against the downstream surface of the combustor dome.
14. A method according to claim 13 further comprising stamping the heat-shield.
15. A method according to claim 13 further comprising providing projections in the combustor dome and slots in the swirler, each of the projections receiving one of the slots therethrough to prevent the swirler from rotating.
16. A combustor dome and heat-shield assembly comprising:
a heat-shield having a first opening therethrough and having a first plurality of securing projections;
a swirler extending through the first opening and capturing the heat-shield; a combustor dome having a second opening therethrough and having an upstream surface and a downstream surface, the swirler extending through the second opening from the downstream surface to the upstream surface to capture the heat-shield on the downstream surface, the second opening comprising a second plurality of slots, each of the plurality of slots for receiving one of the first plurality of securing projections; and
a retaining clip, distinct from the heat shield and combustor dome, that engages the swirler to secure the swirler and the heat-shield on the combustor dome, wherein the swirler comprises a first peripheral axial slot and wherein the second opening comprises a first inwardly extending projection that engages the first peripheral slot to prevent rotation of the swirler, and wherein the swirler comprises an annular slot and an annular abutment downstream of the annular slot for capturing the retaining clip in the slot to secure the combustor dome and the heat-shield between the retainer clip and the annular abutment.