| 摘要 |
FIELD: machine building.SUBSTANCE: axial gas turbine contains a rotor with alternating rows of air-cooled rotor blades and rotor heat shields, and the stator with alternating rows of air-cooled guide vanes and the stator heat shields installed in the holder of the guide vanes. The stator coaxially encloses the rotor outside with formation of the path of hot gases flow between them so that the rows of rotor blades and stator heat shields and rows of the guide vanes and rotor heat shields are located opposite to each other respectively. The row of the guide vanes and the next row of rotor blades downstream form a turbine stage. Rotor blades of the turbine stage are designed with external platforms on their ends. The turbine stage contains the devices guiding the cooling air already used for cooling of the profile part of the turbine stage guide vanes, into the first cavity located between external platforms of the rotor blades and stator heat shields located opposite for protection of stator heat shields against hot gases and for cooling of external platforms of the rotor blades. Each of the guide vanes contains an external platform. Devices for guiding of the cooling air include the second cavity for intake of the cooling air which leaves the profile part of the guide vane. Besides, the devices for guiding of the cooling air include devices of supply of received cooling air in the radial direction into the named first cavity.EFFECT: invention is aimed at improvement of cooling efficiency and minimising of cooling air consumption.7 cl, 6 dwg |
