Combustor heat shield sealing
Combustor assemblies for gas turbine engines are provided. For example, a combustor assembly comprises a combustor dome, a first heat shield having an edge, a second heat shield having an edge, and a seal extending from the edge of the first heat shield to the edge of the second heat shield such that the seal spans a gap between the first heat shield and the second heat shield. In another embodiment, the seal has a first contact portion contacting the edge of the first heat shield, a second contact portion contacting the edge of the second heat shield edge, and a connecting portion connecting the first portion and the second portion. The first contact portion and the second contact portion project away from the connecting portion. Methods for sealing between adjacent heat shields of a combustor assembly also are provided.
1. A method for scaling between adjacent heat shields of a combustor assembly having a combustor dome, the method comprising:
providing a seal that extends from a first heat shield to an adjacent second heat shield such that the seal spans a gap between the first heat shield and the adjacent second heat shield,
wherein each heat shield is formed from a ceramic matrix composite (CMC) material such that each heat shield is a CMC heat shield,
wherein the first heat shield has an edge and the adjacent second heat shield has an edge, the seal extending from the edge of the first heat shield to the edge of the adjacent second heat shield,
wherein the seal comprises:
a housing having a first side wall, an opposite second side wall, and an end wall, the first and second side walls defining a channel, the end wall contacting the combustor dome,
a plunger positioned within the channel and in contact with the first heat shield and the adjacent second heat shield, and
a spring positioned within the channel such that the spring extends from the end wall to the plunger,
wherein the plunder is positioned on the spring such that the spring urges the plunger into contact with the first heat shield and the adjacent second heat shield.
2. The method of claim 1 , wherein each CMC heat shield is formed by:
laying up a plurality of plies of the CMC material;
processing the plurality of plies to form a green state CMC heat shield;
firing the green state GMC heat shield; and
densifying the fired CMC heat shield to produce the CMC heat shield.
3. A combustor assembly for a gas turbine engine, comprising:
a combustor dome;
a first heat shield having an edge;
a second heat shield having an edge; and
a seal extending from the edge of the first heat shield to the edge of the second heat shield such that the seal spans a gap between the first heat shield and the second heat shield, the seal comprising:
a housing having a first side wall, an opposite second side wall, and an end wall, the first and second side walls defining a channel, the end wall contacting the combustor dome,
a plunger positioned within the channel and in contact with the first heat shield and the second heat shield, and
a spring positioned within the channel such that the spring extends from the end wall to the plunger,
wherein the plunger is positioned on the spring such that the spring urges the plunger into contact with the first and second heat shields.
4. The combustor assembly of claim 3 , wherein the seal defines a plurality of openings to allow a flow of purge air therethrough.
5. The combustor assembly of claim 3 , wherein a first interface surface is defined along the edge of the first heat shield and a second interface surface is defined along the edge of the second heat shield, and wherein a first portion of the seal is positioned against the interface surface of the first heat shield and a second portion of the seal is positioned against the interface surface of the second heat shield.
6. The combustor assembly of claim 3 , further comprising:
a third heat shield having an edge,
wherein the first heat shield has a second edge, and
wherein a second seal extends from the second edge of the first heat shield to the edge of the third heat shield such that the seal spans a gap between the first heat shield and the third heat shield.
7. The combustor assembly of claim 1 , wherein the plunger comprises a first contact portion contacting the edge of the first heat shield, a second contact portion contacting the edge of the second heat shield, and a connecting portion connecting the first contact portion and the second contact portion, and wherein the connecting portion is in contact with the spring such that the plunger is permitted to rotate about the spring to maintain contact with the first and second heat shields.
8. A combustor assembly for a gas turbine engine, comprising:
a combustor dome;
a first heat shield having an edge;
a second heat shield having an edge; and
a seal extending from the edge of the first heat shield to the edge of the second heat shield, the seal having;
a plunger comprising a first contact portion contacting the edge of the first heat shield, a second contact portion contacting the edge of the second heat shield edge, and a connecting portion connecting the first contact portion and the second contact portion;
a housing having a first side wall, an opposite second side wall, and an end wall, the first and second side walls defining a channel, the end wall contacting the combustor dome, the plunger being positioned within the channel; and
a spring positioned within the channel such that the spring extends from the end wall to the plunger,
wherein the first contact portion and the second contact portion project away from the connecting portion, and
wherein the plunger is positioned on the spring such that the spring urges the plunger into contact with the first and second heat shields.
9. The combustor assembly of claim 8 , wherein the plunger is formed in a shape of a heat shield perimeter.