Cooled gas turbine transition duct
First Claim
1. A panel of a transition duct for a gas turbine engine, the panel comprising:
- an upstream subpanel joined to a downstream subpanel;
side subpanels joined along respective opposed sides of the upstream panel and the downstream panel, each side subpanel comprising a double bend region of the transition duct; and
cooling structures formed in each of the side subpanels in only regions remote from the respective double bend regions.
3 Assignments
0 Petitions
Accused Products
Abstract
A transition duct (40) for a gas turbine engine (10) incorporating a combination of cooling structures that provide active cooling in selected regions of the duct while avoiding cooling of highly stressed regions of the duct. In one embodiment, a panel (74) formed as part of the transition duct includes some subsurface cooling holes (92) that extend under a central portion of a stiffening rib (90) attached to the panel and some subsurface cooling holes (94) that have a truncated length so as to avoid extending under a rib end (45). Effusion cooling holes (88) used to cool a side subpanel (48) of the panel may have a distribution that reduces to zero approaching a double bend region (48) of the panel. An upstream subpanel (76) of the panel may be actively cooled only when the panel is located on an extrados of the transition duct.
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Citations
8 Claims
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1. A panel of a transition duct for a gas turbine engine, the panel comprising:
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an upstream subpanel joined to a downstream subpanel; side subpanels joined along respective opposed sides of the upstream panel and the downstream panel, each side subpanel comprising a double bend region of the transition duct; and cooling structures formed in each of the side subpanels in only regions remote from the respective double bend regions. - View Dependent Claims (2, 3, 4)
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5. A transition duct for conveying hot combustion gas from a combustor to a turbine in a gas turbine engine, the transition duct comprising:
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a plurality of panels joined together to form a duct comprising a generally cylindrical inlet end and a generally rectangular outlet end disposed radially inwardly of the inlet end when installed in the gas turbine engine; a double bend region formed in a first of the panels; a stiffening rib end region in a second of the panels proximate an end of a stiffening rib joined to an outside surface of the second of the panels; a plurality of cooling structures formed in the panels for passing respective flows of cooling air through the panels; and wherein the cooling structures are formed to avoid both the double bend region and the stiffening rib end region. - View Dependent Claims (6)
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7. A transition duct for conveying hot combustion gas from a combustor to a turbine in a gas turbine engine, the transition duct comprising:
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a plurality of panels joined together to form a duct comprising a generally cylindrical inlet end and a generally rectangular outlet end disposed radially inwardly of the inlet end when installed in the gas turbine engine; the outlet end comprising an outlet mouth formed to extend across at least approximately a 45°
arc of a turbine inlet;a stiffening rib end region in one of the panels proximate an end of a stiffening rib joined to an outside surface of the one of the panels; a plurality of subsurface cooling passages formed through the one of the panels, each subsurface cooling passage having an inlet opening to an outside surface of the duct and an outlet opening to an inside surface of the duct; and wherein the cooling passages are formed to avoid the stiffening rib end region. - View Dependent Claims (8)
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Specification