Patent ID: 6264426
Filing Date: 2001-07-24
Classification: F01D,F05D

Abstract:
A gas turbine stationary blade comprising:a blade, an outer shroud attached to an outer end of the blade, and an inner shroud attached to an inner end of the blade;a steam cooling section adjacent a leading edge of the blade and extending in a downstream direction therefrom, the steam cooling section comprising a cooling steam supply port in the outer shroud, a serpentine flow path contained within the blade and adapted to receive cooling steam from the supply port such that the cooling steam first flows along the leading edge of the blade and then proceeds downstream, and a steam recovery port formed in the outer shroud at a downstream end of the steam cooling section, the serpentine flow path including a plurality of turns and having turbulators extending from inner surfaces of the flow path slantwise to the steam flow direction;an air cooling section adjacent the downstream end of the steam cooling section and comprising an air flow path extending lengthwise through the blade from the outer shroud to the inner shroud, slot holes formed in the blade at the trailing edge thereof, and a cooling air supply port for supplying the cooling air to the slot holes, the air flow path having turbulators extending from inner surfaces of the air flow path slantwise to the air flow direction; andan inner impingement plate formed at the inner shroud and positioned adjacent a final turn of the serpentine flow path such that the cooling steam passes through the inner impingement plate to cool the inner shroud and is then turned through the final turn at the inner shroud to flow back to the outer shroud where all of the cooling steam is then recovered through the steam recovery port at the outer shroud.