Back to results
US 11,959,396 B2Granted
Gas turbine engine article with cooling holes for mitigating recession
AssigneeRtx Corporation
InventorsThomas J. Martin, Gajawalli V. Srinivasan, Paul F. Croteau, Matthew B. Kennedy
Life of this patent
Estimating the term…
Abstract
A gas turbine engine article includes a silicon-containing ceramic wall that has an external combustion gaspath side and an internal side that borders a cooling air cavity. The external combustion gaspath side has an associated combustion gas flow direction there along. An array of cooling holes extends through the silicon-containing ceramic wall and connects the internal side with the external combustion gaspath side. The cooling holes are oriented to discharge cooling air to the external gaspath side in a direction counter to the combustion gas flow direction.
Claims10
A gas turbine engine article comprising:
- a silicon-containing ceramic wall having an external combustion gas path side and an internal side that borders a cooling air cavity, the external combustion gas path side having an associated combustion gas flow direction along the external combustion gas path side;
- and
- an array of cooling holes extending through the silicon-containing ceramic wall and connecting the internal side with the external combustion gas path side, the cooling holes being oriented to discharge cooling air to the external combustion gas path side in a direction counter to the combustion gas flow direction, each of the cooling holes being comprised of a metering hole section of constant cross-sectional area and a surface breakout section that diverges from the metering hole section, the array including at least a first row of the cooling holes and a second row of the cooling holes, the surface breakout section of each of the cooling holes of the first row having a crescent geometry, and the surface breakout section of each of the cooling holes of the second row having a lobed geometry.
A gas turbine engine comprising:
- a compressor section;
- a combustor in fluid communication with the compressor section;
- and
- a turbine section in fluid communication with the combustor, at least one of the turbine section or the combustor having an article that includes:
- a silicon-containing ceramic wall having an external combustion gas path side and an internal side that borders a cooling air cavity, the external combustion gas path side having an associated combustion gas flow direction along the external combustion gas path side, and
- an array of cooling holes extending through the silicon-containing ceramic wall and connecting the internal side with the external combustion gas path side, the cooling holes being oriented to discharge cooling air to the external combustion gas path side in a direction counter to the combustion gas flow direction, each of the cooling holes being comprised of a metering hole section of constant cross-sectional area and a surface breakout section that diverges from the metering hole section, the cooling holes being arranged in the array with a ligament length to cooling hole diameter of 2:1 to 8:1, the array including at least a first row of the cooling holes and a second row of the cooling holes, the surface breakout section of each of the cooling holes of the first row having a crescent geometry, and the surface breakout section of each of the cooling holes of the second row having a lobed geometry.
3 more elements
A method of mitigating silicon recession, the method comprising:
- providing a gas turbine engine article in a gas turbine engine, the gas turbine engine article includes a silicon-containing ceramic wall that has an external combustion gas path side and an internal side that borders a cooling air cavity, and an array of cooling holes that extend through the silicon-containing ceramic wall and that connect the internal side with the external combustion gas path side, wherein there is a combustion gas flow across the external combustion gas path side along an associated combustion gas flow direction;
- and
- emitting cooling air from the array of cooling holes in a direction counter to the combustion gas flow direction, the cooling air cooling the external combustion gas path side-, shielding the external combustion gas path side from the combustion gas flow, and locally reducing velocity of the combustion gas flow to mitigate silicon recession, each of the cooling holes being comprised of a metering hole section of constant cross-sectional area and a surface breakout section that diverges from the metering hole section, the cooling holes being arranged in the array with a ligament length to cooling hole diameter of 2:1 to 8:1, the array including at least a first row of the cooling holes and a second row of the cooling holes, the surface breakout section of each of the cooling holes of the first row has a crescent geometry, and the surface breakout section of each of the cooling holes of the second row has a lobed geometry.
Dependencies are inferred from the claim text.