Combustion engine, gas turbine, and abrasive layer

Details Combustion engine, gas turbine, and abrasive layer Combustion engine, gas turbine, and abrasive layer

F - Mech Eng,Light,Heat,Weapons

01

D

F01D 5/20 (2006.01) C25D 15/02 (2006.01) F01D 11/12 (2006.01) F02C 7/28 (2006.01)

Patent

CA 2407544

The present invention provides a gas turbine in which a proper clearance is kept between a rotor blade and a shroud for a long period of time from the start of operation, so that damage to the rotor blade is less likely to occur. In a turbine portion of the gas turbine, the rotor blade and the shroud face each other. At the tip end of the rotor blade an abrasive layer is formed, and on the inner peripheral surface of the shroud a heat insulating layer is formed. The abrasive layer is formed of a matrix with many abrasive particles dispersed in the matrix. The abrasive particles include protruding particles protruding from the matrix, and embedded particles embedded in the matrix. In the initial sliding of the rotor blade and the shroud in the early stage of operation, the inner peripheral surface of the shroud is ground by the protruding particles. After the protruding particles have disappeared, the inner peripheral surface of the shroud is ground by the embedded particles.

L'invention concerne une turbine à gaz assurant un jeu utile entre une pale de rotor et un épaulement longtemps après le démarrage d'une opération pour empêcher la dégradation de la pale de rotor. La pale de rotor fait face à l'épaulement dans la turbine. Une couche de polissage est formée au bout de la pale de rotor. Une couche de blindage thermique est formée sur la surface périphérique interne de l'épaulement. La couche de polissage est composée d'une matrice et d'un grand nombre de particules abrasives réparties dans la matrice. Ces particules abrasives contiennent des particules saillantes qui dépassent de la matrice et des particules noyées qui sont enfouies dans la matrice. La surface périphérique interne de l'épaulement est polie par les particules saillantes pendant le glissement initial entre la pale de rotor et l'épaulement au cours de l'étape initiale du fonctionnement, et, après dissipation des particules saillantes, la surface périphérique interne de l'épaulement est polie par les particules noyées.

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