AXIAL GAS TURBINE Russian patent published in 2015 - IPC F01D5/08 F01D9/04 

FIELD: machine building.

SUBSTANCE: gas turbine comprises a rotor with alternating rows of air cooled working blades and rotor heat shields and a stator with alternating rows of air cooled guide blades and stator heat shields which are installed in the guide blade holder. The stator encloses the rotor from outside so that a hot gas path is formed between them and the working blade rows and heat shields of the rotor and guide blade rows and heat shields of the stator are set opposite each other respectively. A row of guide blade and the next row of working blades in the flow downstream direction form a turbine stage. Each working blade of a turbine stage is fitted by a tip at its end. Each guide blade of a turbine stage is fitted by an external platform of the guide blade. The external platforms of guide blades in the turbine stage and the adjacent heat shields of the stator are matched to each other due to the fact that every external guide blade platform is fitted by a projection on its back wall in the downstream direction. The projection passes downstream to the front edge of the working blade tip and into the respective recess made in the adjacent heat shield of the stator. The stator heat shields in the turbine stage are cooled by the introduction of cooling air into the cavity located at the back of each stator heat shield. The cooling air enters the hot gas path through the holes in the side surface of the stator heat shield passing upstream and downstream. The cavity for the cooling air to enter through the hole is located at the back of the external platform of every guide blade in the turbine stage. The cooling air jets are delivered to the working blade tips from the cavity by means of the holes passing through the said projection downstream. It is provided for the grooves passing in downstream direction through the projections to direct the cooling air flow exactly into the gap between the adjacent circumferential heat shields of the stator.

EFFECT: invention is aimed at cooling efficiency increase, decrease of cooling air mass flow rate.

3 cl, 7 dwg