| 主权项 |
1. An axial gas turbine comprising:
a rotor with alternating rows of air-cooled blades and rotor heat shields; a stator with a vane carrier, alternating rows of air-cooled vanes, and stator heat shields mounted on the vane carrier, 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; a cavity on a backside of each stator heat shield; and holes at downstream and upstream sides of the stator heat shield; wherein the stator heat shields within the turbine stage are cooled when cooling air is introduced into the cavity of each stator heat shield, the cooling air being discharged into the hot gas path through the holes of the stator heat shield; wherein the blades of the turbine stage each comprise a tip and a blade crown on the tip, and the vanes of the turbine stage each comprise an outer vane platform; wherein the stator heat shields and the outer vane platforms within the turbine stage are adapted to one another such that air leaking through joints between the outer vane platforms and adjacent stator heat shields into the hot gas path is directed onto the blade crowns of the blades; wherein each of the outer vane platforms comprises a downstream projection at a rear wall, and each of the adjacent stator heat shields comprises a recess, the projection extends downstream to a leading edge of the blade crown of a respective one of the blades and into a respective recess; a hole and a cavity on the backside of the outer vane platform of each vane, and holes running downstream through said projection; wherein the vanes within the turbine stage are cooled when introducing cooling air through the hole on the backside of each outer vane platform, and jets of cooling air are directed onto the blade crowns from said cavity on the backside of each stator heat shield by the holes running downstream through said projection of each outer vane platform; slits running downstream through said projection, the slits being configured and arranged to direct cooling air into an interstice between circumferentially adjacent stator heat shields; and additional holes at the outer blades platforms configured and arranged to direct cooling air from the cavity on the backside of each of the outer vane platforms downstream onto the blade crowns of the blades below said projections of the outer vane platforms. |
