High pressure turbine dirt blocker
A dirt blocker including a support structure disposed within a gas turbine engine, the support structure defining an upstream control volume proximate a forward portion of the gas turbine engine and a downstream control volume proximate an aft portion of the gas turbine engine, the downstream control volume being opposite the upstream control volume relative to the support structure, a flow passage formed through the support structure, the flow passage configured to fluidly couple the upstream control volume with the downstream control volume; a radial contact wall formed from the support structure in fluid communication with the upstream control volume, the radial contact wall configured to intercept debris entrained within cooling air within the gas turbine engine; and a stagnation zone fluidly coupled with the flow passage, the stagnation zone configured to reduce momentum of the debris.
1. A dirt blocker comprising:
a support structure disposed within a gas turbine engine, the gas turbine engine having a central longitudinal axis and comprising a high pressure turbine stage including a high pressure turbine stage vane axially forward of a high pressure turbine stage blade, the support structure disposed radially outward with respect to the central longitudinal axis from the high pressure turbine stage vane, axially aligned with the high pressure turbine stage vane and axially forward of the high pressure turbine stage blade, said support structure defining and dividing an upstream control volume and a downstream control volume, said downstream control volume being opposite said upstream control volume relative to said support structure, wherein upstream and downstream are with respect to cooling air flow direction,
a flow passage formed radially through an axially extending portion of said support structure, said flow passage formed between and configured to fluidly couple said upstream control volume with said downstream control volume, all of said upstream control volume being upstream of the flow passage, all of the downstream control volume being downstream of the flow passage;
a radial contact wall extending from said support structure within said upstream control volume upstream of the flow passage, said radial contact wall configured to intercept debris entrained within cooling air within said upstream control volume upstream of the flow passage; and
a stagnation zone within said upstream control volume fluidly coupled with said flow passage, the stagnation zone being upstream of the flow passage and axially aft of the flow passage, said stagnation zone configured to reduce momentum of said debris upstream of the flow passage.
2. The dirt blocker according to claim 1 , further comprising:
a debris wall coupled to said support structure proximate an upstream side, the debris wall being upstream of the flow passage, said debris wall being fluidly coupled to a bore formed between said radial contact wall and said debris wall, said bore in fluid communication with said flow passage.
3. The dirt blocker according to claim 2 , further comprising an aft facing slot in fluid communication with said bore, the aft facing slot located upstream of the flow passage.
4. The dirt blocker according to claim 3 , wherein said aft facing slot is fluidly coupled with said stagnation zone.
5. A dirt blocker for a high pressure turbine comprising:
a support structure disposed within said high pressure turbine, said high pressure turbine having a central longitudinal axis and comprising a high pressure turbine stage including a high pressure turbine stage vane axially forward of a high pressure turbine stage blade, the support structure disposed radially outward with respect to the central longitudinal axis from the high pressure turbine stage vane, axially aligned with the high pressure turbine stage vane and axially forward of the high pressure turbine stage blade, said support structure defining an upstream control volume and a downstream control volume, said downstream control volume being opposite said upstream control volume relative to said support structure, said support structure dividing the upstream control volume from the downstream control volume, wherein upstream and downstream are with respect to cooling air flow direction;
a flow passage formed radially through an axially extending portion of said support structure, said flow passage configured to fluidly couple said upstream control volume with said downstream control volume, the flow passage formed between the upstream control volume and the downstream control volume, all of the upstream control volume being upstream of the flow passage, all of the downstream control volume being downstream of the flow passage;
a radial contact wall unitary with said support structure within said upstream control volume upstream of the flow passage, said radial contact wall configured to intercept debris entrained within cooling air upstream of the flow passage within the upstream control volume of said high pressure turbine before passing through the flow passage; and
a stagnation zone fluidly coupled with said flow passage, the stagnation zone being upstream of the flow passage and axially aft of the flow passage, said stagnation zone configured to reduce momentum of said debris.
6. The dirt blocker for a high pressure turbine according to claim 5 , further comprising:
a debris wall formed from said support structure proximate an upstream side, said debris wall being fluidly coupled to a bore formed between said radial contact wall and said debris wall, the debris wall being upstream of the flow passage, said bore in fluid communication with said flow passage.
7. A process for removing debris entrained in a gas turbine engine cooling air flow, the gas turbine engine comprising:
a central longitudinal axis;
a high pressure turbine stage including a high pressure turbine stage vane axially forward of a high pressure turbine stage blade;
a support structure disposed within the gas turbine engine radially outward with respect to the central longitudinal axis from the high pressure turbine stage vane, axially aligned with the high pressure turbine stage vane and axially forward of the high pressure turbine stage blade, said support structure defining and dividing an upstream control volume and a downstream control volume, said downstream control volume being opposite said upstream control volume relative to said support structure, wherein upstream and downstream are with respect to cooling air flow direction,
a flow passage formed radially through an axially extending portion of said support structure, said flow passage formed between and configured to fluidly couple said upstream control volume with said downstream control volume, all of said upstream control volume being upstream of the flow passage, all of the downstream control volume being downstream of the flow passage;
a radial contact wall extending from said support structure within said upstream control volume upstream of the flow passage, said radial contact wall configured to intercept debris entrained within cooling air within said upstream control volume upstream of the flow passage; and
a stagnation zone within said upstream control volume fluidly coupled with said flow passage, the stagnation zone being upstream of the flow passage and axially aft of the flow passage, said stagnation zone configured to reduce momentum of said debris upstream of the flow passage; and
the process for removing debris entrained in the gas turbine engine cooling air flow comprising:
flowing the cooling air through the gas turbine engine;
bisecting a portion of the high pressure turbine stage of said gas turbine engine with the support structure disposed radially outward with respect to the central longitudinal axis from the high pressure turbine stage vane, axially aligned with the high pressure turbine stage vane and axially forward of the high pressure turbine stage blade within said gas turbine engine;
forming the radial contact wall unitary with said support structure in fluid communication with said upstream control volume;
flowing the cooling air into the upstream control volume, said radial contact wall configured to intercept debris entrained within the cooling air;
forming the stagnation zone within the upstream control volume fluidly coupled with said flow passage, said stagnation zone configured to reduce momentum of said debris; and
flowing the cooling air through the flow passage through said support structure, said flow passage fluidly coupling said upstream control volume with said downstream control volume.
8. The process of claim 7 , further comprising:
forming a debris wall unitary with said support structure proximate an upstream side; and
fluidly coupling said debris wall to a bore formed between said radial contact wall and said debris wall, said bore in fluid communication with said flow passage.