Cooling system for three hook ring segment
First Claim
1. A turbine shroud assembly for a gas turbine engine, said turbine shroud assembly comprising:
- a ring segment including a ring segment panel comprising a leading edge, a trailing edge and a midsection defined therebetween, said ring segment comprising a forward mounting hook at said leading edge, a midsection mounting hook at said midsection and an aft mounting hook at said trailing edge;
a ring segment carrier circumferentially spanning and supporting said ring segment, said ring segment carrier comprising a forward section, a midsection and an aft section, said forward section forming a forward hanger coupled to said forward mounting hook, said midsection forming a midsection hanger coupled to said midsection mounting hook defining a first leakage path, said aft section forming an aft hanger coupled to said aft mounting hook defining a second leakage path;
a forward impingement cooling chamber defined between said ring segment panel and said ring segment carrier and between said forward mounting hook and said midsection mounting hook;
at least one feed hole extending through said ring segment carrier and configured to meter high pressure cooling air into said forward impingement cooling chamber;
an aft low pressure chamber defined between said ring segment panel and said ring segment carrier and between said midsection hanger and said aft mounting hook, said ring segment carrier substantially preventing cooling air from entering said aft low pressure chamber;
an isolation plate extending between said midsection mounting hook and an aft location adjacent to said ring segment panel defining an isolation chamber radially inward from said aft low pressure chamber between said isolation plate and said ring segment panel; and
a transverse crossover passage formed through said midsection mounting hook providing cooling air from said forward impingement cooling chamber to said isolation chamber, said isolation plate substantially preventing cooling air provided to said isolation chamber from entering said aft low pressure chamber.
2 Assignments
0 Petitions
Accused Products
Abstract
A triple hook ring segment including forward, midsection and aft mounting hooks for engagement with respective hangers formed on a ring segment carrier for supporting a ring segment panel, and defining a forward high pressure chamber and an aft low pressure chamber on opposing sides of the midsection mounting hook. An isolation plate is provided on the aft side of the midsection mounting hook to form an isolation chamber between the aft low pressure chamber and the ring segment panel. High pressure air is supplied to the forward chamber and flows to the isolation chamber through crossover passages in the midsection hook. The isolation chamber provides convection cooling air to an aft portion of the ring segment panel and enables a reduction of air pressure in the aft low pressure chamber to reduce leakage flow of cooling air from the ring segment.
79 Citations
19 Claims
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1. A turbine shroud assembly for a gas turbine engine, said turbine shroud assembly comprising:
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a ring segment including a ring segment panel comprising a leading edge, a trailing edge and a midsection defined therebetween, said ring segment comprising a forward mounting hook at said leading edge, a midsection mounting hook at said midsection and an aft mounting hook at said trailing edge; a ring segment carrier circumferentially spanning and supporting said ring segment, said ring segment carrier comprising a forward section, a midsection and an aft section, said forward section forming a forward hanger coupled to said forward mounting hook, said midsection forming a midsection hanger coupled to said midsection mounting hook defining a first leakage path, said aft section forming an aft hanger coupled to said aft mounting hook defining a second leakage path; a forward impingement cooling chamber defined between said ring segment panel and said ring segment carrier and between said forward mounting hook and said midsection mounting hook; at least one feed hole extending through said ring segment carrier and configured to meter high pressure cooling air into said forward impingement cooling chamber; an aft low pressure chamber defined between said ring segment panel and said ring segment carrier and between said midsection hanger and said aft mounting hook, said ring segment carrier substantially preventing cooling air from entering said aft low pressure chamber; an isolation plate extending between said midsection mounting hook and an aft location adjacent to said ring segment panel defining an isolation chamber radially inward from said aft low pressure chamber between said isolation plate and said ring segment panel; and a transverse crossover passage formed through said midsection mounting hook providing cooling air from said forward impingement cooling chamber to said isolation chamber, said isolation plate substantially preventing cooling air provided to said isolation chamber from entering said aft low pressure chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A turbine shroud assembly for a gas turbine engine, said turbine shroud assembly comprising:
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a ring segment including a ring segment panel comprising a leading edge, a trailing edge and a midsection defined therebetween, said ring segment comprising a forward mounting hook at said leading edge, a midsection mounting hook at said midsection and an aft mounting hook at said trailing edge; a ring segment carrier circumferentially spanning and supporting said ring segment, said ring segment carrier comprising a forward section, a midsection and an aft section, said forward section forming a forward hanger coupled to said forward mounting hook, said midsection forming a midsection hanger coupled to said midsection mounting hook defining a first leakage path, said aft section forming an aft hanger coupled to said aft mounting hook defining a second leakage path; said forward section of said ring segment carrier including a forward support structure engaged with a forward cooperating structure of a casing of the engine, said midsection of said ring segment carrier including a midsection support structure engaged with a midsection cooperating structure of said casing, and said aft section of said ring segment carrier including an aft support structure engaged with an aft cooperating structure of said casing; a forward high pressure plenum defined between said forward support structure and said midsection support structure for providing high pressure cooling air to a forward impingement cooling chamber defined between said ring segment panel and said ring segment carrier and between said forward mounting hook and said midsection mounting hook; an aft low pressure plenum defined between said midsection support structure and said aft support structure and substantially isolated from said high pressure cooling air of said forward high pressure plenum; an aft low pressure chamber defined between said ring segment panel and said ring segment carrier and between said midsection hanger and said aft mounting hook; an isolation chamber defined radially inward from said aft low pressure chamber between said midsection mounting hook and said aft mounting hook; a transverse crossover passage connecting said forward impingement cooling chamber to said isolation chamber; and said isolation chamber substantially isolating said aft low pressure chamber from cooling air provided through said transverse crossover passage to effect a reduction of leakage air through said second leakage path. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification