Compressor protection means

In a gas turbine engine including a compressor having a casing with a mounting slot adapted to receive a mounting tang of a stationary airfoil, a plurality of bleed apertures extending through said casing and communicating said slot with a bleed manifold extending about said casing radially outwardly thereof, each of said apertures having an aperture surface area, said slot having a first surface in engagement with said tang and a second surface spaced from said tang, the improvement comprising:

• first means for preventing incendiary particles entrained in a gas stream flowing through said slot from impinging upon said second surface;
• and
• shielding means for isolating said aperture surface area from impingement by said particles.

In a gas turbine engine including a compressor having a casing, a plurality of bleed apertures each of said apertures having an aperture surface area extendng through said casing and communicating with a bleed manifold extending about said casing radially outwardly thereof, the improvement comprising:

• shielding means for preventing particles entrained in a gas stream flowing through at least one of said apertures from impinging upon said aperture surface area,
• wherein said shielding means is comprised of coating means having a first layer of material substantially comprised of nickel covering said aperture surface area for isolation of said aperture surface area from impingement by said particles.

In a gas turbine engine including a compressor having a casing, a plurality of bleed apertures, each of said apertures having an aperture surface area extending through said casing and communicating with a bleed manifold extending about said casing radially outwardly thereof, the improvement comprising grommet means disposed within said apertures for preventing particles entrained in a gas stream flowing through at least one of said apertures from impinging upon said aperture surface area, and wherein said grommet means is comprised of a material which is essentially nonpyrophoric and adapted to sublime in said aperture.

In a gas turbine engine including a compressor having a casing, a plurality of bleed apertures, each of said apertures having an aperture surface area extending through said casing and communicating with a bleed manifold extending about said casing radially outwardly thereof, the improvement comprising grommet means disposed within said apertures for preventing particles entrained in a gas stream flowing through at least one of said apertures from impinging upon said aperture surface area, and wherein said grommet means is comprised of a material which, when oxidized in said aperture, produces an oxide in gaseous form.

In a gas turbine engine includng a compressor having a casing with a passage adapted to pass bleed air to a circumferentially extending bleed manifold surrounding said casing, said passage including a surface exposed to incendiary particles periodically entrained in said bleed air, the improvement comprising means disposed between said surface and said bleed air for preventing impingement of said particles upon said exposed surface, said means comprised of a material which when reacted with said particles forms a compound which is essentially nonpyrophoric in the environment of said passage.

In a gas turbine engine including a compressor having a casing with a passage adapted to pass bleed air to a circumferentially extending bleed manifold surrounding said casing, said passage including a surface exposed to incendiary particles periodically entrained in said bleed air, the improvement comprising means disposed between said surface and said bleed air for preventing impingement of said particles upon said exposed surface, comprised of a material which is essentially nonpyrophoric and adapted to sublime in the environment of said passage.

In a gas turbine engine including a compressor having a casing with a passage adapted to pass bleed air to a circumferentially extending bleed manifold surrounding said casing, said passage including a surface exposed to incendiary particles entrained in said bleed air, the improvement comprising means disposed between said surface and said bleed air for preventing impingement of said particles upon said exposed surface, said means comprised of a material which, when oxidized in said passage, produces an oxide in gaseous form.