Abstract: A turbine blade includes an airfoil having pressure and suction sidewalls extending between leading and trailing edges and root and tip. The tip includes squealer ribs extending from a tip floor forming an open tip cavity. The rib along the pressure sidewall has a squared external corner, and a flute extends along the base of the rib at the tip floor.

Abstract: A turbine blade includes an airfoil having pressure and suction sidewalls spaced apart between opposite leading and trailing edges and interconnected by a plurality of partitions to define first and second independent cooling circuits therein. The cooling circuits have corresponding inlets in a dovetail of the blade and extend through a platform of the blade and through the airfoil to its tip. A common discharge chamber is disposed below the airfoil tip and includes a plurality of outlet holes for discharging cooling air from the circuits.

Abstract: A turbine rotor blade includes an airfoil having pressure and suction sidewalls extending longitudinally in span from root to tip. The sidewalls are spaced apart between leading and trailing edges and joined together by longitudinal partitions defining flow channels therein. Rows of first and second slant turbulators extend from one of the sidewalls in one of the channels and are offset longitudinally. The first and second turbulators overlap chordally to eliminate an axial gap therebetween while maintaining a radial gap for tripping cooling air channeled along the span of the channel.

Abstract: A turbine airfoil includes opposite pressure and suction sides extending in span from a flowpath surface. The flowpath surface has chordally opposite forward and aft edges and laterally opposite first and second endfaces corresponding with the airfoil pressure and suction sides. The flowpath surface joins the first endface at the forward edge in a forward bullnose and joins the second endface at the aft edge in an aft bullnose, with the bullnoses varying in radius from the opposite edges.

Abstract: A turbine nozzle includes a hollow vane joined to opposite inner and outer bands. The inner band includes a forward lip under the leading edge of the vane, an aft lip under the trailing edge of the vane, and a mounting flange spaced therebetween. An impingement bore extends obliquely and aft from the base of the mounting flange under a corner of the inner band toward the aft lip for impingement cooling thereof.

Abstract: A turbine blade includes an airfoil having pressure and suction sidewalls spaced apart between opposite leading and trailing edges and interconnected by a plurality of partitions to define first and second independent cooling circuits therein. The cooling circuits have corresponding inlets in a dovetail of the blade and extend through a platform of the blade and through the airfoil to its tip. A common discharge chamber is disposed below the airfoil tip and includes a plurality of outlet holes for discharging cooling air from the circuits.

Abstract: A turbine rotor blade includes an airfoil having pressure and suction sidewalls extending longitudinally in span from root to tip. The sidewalls are spaced apart between leading and trailing edges and joined together by longitudinal partitions defining flow channels therein. Rows of first and second slant turbulators extend from one of the sidewalls in one of the channels and are offset longitudinally. The first and second turbulators overlap chordally to eliminate an axial gap therebetween while maintaining a radial gap for tripping cooling air channeled along the span of the channel.

Abstract: A turbine blade includes an airfoil having pressure and suction sidewalls extending between leading and trailing edges and root and tip. The tip includes squealer ribs extending from a tip floor forming an open tip cavity. The rib along the pressure sidewall has a squared external corner, and a flute extends along the base of the rib at the tip floor.

Abstract: A turbine nozzle includes hollow vanes extending between outer and inner bands. The vanes include a pattern of outlet holes distributed over the pressure and suction sides thereof for discharging cooling air collectively at a reference flowrate. The pattern of holes includes multiple rows of showerhead holes bridging the leading edge, and two rows of gill holes spaced aft therefrom along the suction side. A row of auxiliary holes is spaced aft from the showerhead holes through the pressure side, and the gill holes are sized to counterbalance the added discharge air through the auxiliary holes for maintaining the reference flowrate.

Abstract: A latch assembly for a door including a door retainer projection is provided. The latch assembly includes a handle pivotally mounted to the door for rotation about a first end, and a latch actuator contacting the handle and mounted to the door for rotation about a first end. The handle rotates in one direction when actuated and the latch actuator rotates in a second direction opposite the first direction. A keeper is engaged to the door retainer projection in a closed position, and the latch actuator is configured to disengage the keeper from the door retainer projection when the handle is actuated.

Abstract: A turbine nozzle includes hollow vanes extending between outer and inner bands. The vanes include a pattern of outlet holes distributed over the pressure and suction sides thereof for discharging cooling air collectively at a reference flowrate. The pattern of holes includes multiple rows of showerhead holes bridging the leading edge, and two rows of gill holes spaced aft therefrom along the suction side. A row of auxiliary holes is spaced aft from the showerhead holes through the pressure side, and the gill holes are sized to counterbalance the added discharge air through the auxiliary holes for maintaining the reference flowrate.

Abstract: A latch assembly includes a handle, a handle retainer, and a keeper. The keeper includes a biasing mechanism and a head comprising a catch, a lock release projection, and a switch actuator. The keeper biasing member configured to facilitate engaging the catch with the door. The handle biasing member configured to facilitate maintaining the handle in a first position. The handle includes a contact surface slidingly coupled to the lock release projection to facilitate coupling the door to the tub assembly.

Abstract: A turbine nozzle assembly for a gas turbine engine, including: a plurality of segments joined together to form an outer band; a plurality of segments joined together to form an inner band; at least one airfoil positioned between the outer and inner bands; a leaf seal attached to each inner band segment by at least one pin member; and, a leaf seal attached to each outer band segment by at least one pin member. Each of the inner band segments includes a protrusion extending from a surface thereof so as to provide balanced support to the corresponding leaf seal in conjunction with the pin members. Each of the inner band segments further includes a first portion having a flange extending therefrom, a second portion opposite the first portion, a first end, and a second end opposite the first end, wherein the surface extends between the first and second ends and the first and second portions.

Abstract: A turbine nozzle assembly for a gas turbine engine, including: a plurality of segments joined together to form an outer band; a plurality of segments joined together to form an inner band; at least one airfoil positioned between the outer and inner bands; a leaf seal attached to each inner band segment by at least one pin member; and, a leaf seal attached to each outer band segment by at least one pin member. Each of the inner band segments includes a protrusion extending from a surface thereof so as to provide balanced support to the corresponding leaf seal in conjunction with the pin members. Each of the inner band segments further includes a first portion having a flange extending therefrom, a second portion opposite the first portion, a first end, and a second end opposite the first end, wherein the surface extends between the first and second ends and the first and second portions.

Abstract: A latch assembly includes a handle, a handle retainer, and a keeper. The keeper includes a biasing mechanism and a head comprising a catch, a lock release projection, and a switch actuator. The keeper biasing member configured to facilitate engaging the catch with the door. The handle biasing member configured to facilitate maintaining the handle in a first position. The handle includes a contact surface slidingly coupled to the lock release projection to facilitate coupling the door to the tub assembly.

Abstract: A latch assembly for a door including a door retainer projection is provided. The latch assembly includes a handle pivotally mounted to the door for rotation about a first end, and a latch actuator contacting said handle and mounted to the door for rotation about a first end. The handle rotates in one direction when actuated and said latch actuator rotates in a second direction opposite the first direction. A keeper is engaged to the door retainer projection in a closed position, and the latch actuator is configured to disengage said keeper from the door retainer projection when said handle is actuated.