Patent ID: 8834096
Filing Date: 2014-09-16
Classification: F01D,F05D

Abstract:
1. An axial flow gas turbine comprising: a rotor including alternating rows of air-cooled blades and rotor heat shields, and a stator including inner rings, alternating rows of air-cooled vanes, and stator heat shields mounted on the inner rings, wherein the stator coaxially surrounds the rotor to define a hot gas path therebetween, such that the rows of blades and stator heat shields, and the rows of vanes and rotor heat shields, are opposite to each other, respectively, and a row of vanes and an adjacent row of blades in the downstream direction define a turbine stage, wherein at least one of the vanes includes a projection extending downstream, and wherein the blades comprise tips and outer blade platforms at the tips; and wherein the outer blade platforms comprise a plurality of radially outer teeth running parallel to each other in the circumferential direction and being arranged one after the other in the direction of the hot gas flow, said teeth being divided into first and second teeth, wherein the second teeth are positioned downstream of the first teeth, wherein the first teeth are opposite to said projection of adjacent vanes of the turbine stage, and wherein the second teeth are opposite to respective stator heat shields.