초록 ▼

The nozzle segment includes a vane having a plurality of axially spaced cavities for transmission of a cooling medium. In a closed circuit cooling system, air is transmitted radially inwardly and outwardly through inserts in leading and intermediate cavities, respectively, for flow through holes for

The nozzle segment includes a vane having a plurality of axially spaced cavities for transmission of a cooling medium. In a closed circuit cooling system, air is transmitted radially inwardly and outwardly through inserts in leading and intermediate cavities, respectively, for flow through holes for impingement cooling of the adjoining vane surfaces. Radial inlet flow of cooling medium to an aft cavity likewise flows through an insert for impingement cooling of the aft cavity walls. The cooling medium flows from the aft cavity into a trailing edge cavity for impingement cooling of the trailing edge. The spent cooling flow passes through a channel in the diaphragm into the wheelspace. In the open air circuit, the spent impingement flow in the leading and intermediate cavities passes through openings in the vane wall for thin film cooling of the vane. An insert is received in the trailing edge cavity for impingement cooling of the trailing edge walls and flow towards the trailing edge on opposite sides of a tongue for turbulent flow through a multiplicity of openings through the trailing edge into the hot gas stream.

대표청구항 ▼

A closed circuit air-cooled stator vane segment comprising: inner and outer walls spaced from one another; a vane extending between said inner and outer walls and having leading and trailing edges, said vane including discrete leading edge, trailing edge and intermediate cavities between the leading

A closed circuit air-cooled stator vane segment comprising: inner and outer walls spaced from one another; a vane extending between said inner and outer walls and having leading and trailing edges, said vane including discrete leading edge, trailing edge and intermediate cavities between the leading and trailing edges and extending radially of said vane, first and second air inlets for supplying cooling air to said leading edge and trailing edge cavities, respectively; an insert in said leading edge cavity for receiving cooling air from said first air inlet and having impingement openings for directing the cooling air against interior wall surfaces of said leading edge cavity for impingement cooling of the vane about said leading edge cavity; an insert in said intermediate cavity for receiving cooling air and having impingement openings for directing the cooling air against interior wall surfaces of said intermediate cavity for impingement cooling of said vane about said intermediate cavity; said trailing edge cavity through said vane lying in communication with said second inlet for receiving cooling air therefrom and having an outlet at a radially inner end thereof, said outlet including a passage for directing spent cooling air into a wheelspace between adjacent turbine stages; and a discrete aft cavity between said intermediate cavity and said trailing edge cavity, an insert in said aft cavity for receiving cooling air and having impingement openings for directing the cooling air against interior wall surfaces of said vane adjacent said aft cavity for impingement cooling of said vane, a plurality of ribs projecting inwardly of said interior wall surfaces of each said leading edge cavity, said intermediate cavity and said aft cavity at spaced locations therealong to define flow chambers between said interior wall surfaces and said inserts, at least two of said inserts having at least one radially extending flow channel each in communication with said flow chambers formed by respective inserts for directing spent cooling air from the respective cavity.