Turbine blade cascade end wall

F - Mech Eng,Light,Heat,Weapons – 01 – D

Patent

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Details

F01D 5/14 (2006.01) F01D 9/02 (2006.01)

Patent

CA 2641806

In turbine blades having a large outflow angle, a cross flow generated on a turbine end wall and curling of flow on blade rear surfaces are reduced irrespective of the shape of the blades, thereby reducing a loss to improve performance of the entire turbine. The turbine cascade end wall (10) is positioned on the hub side and/or the tip side of the annularly arranged turbine blades (B). The turbine cascade end wall has first projections (13) each having a ridge lowering gently initially and sharply finally from the rear edge of a turbine blade toward the downstream side while extending along the rear surface of an adjacent turbine blade.

Selon l'invention, dans des aubes de turbine présentant un grand angle de sortie, l'écoulement transversal produit sur une paroi de bout de la turbine et l'enroulement de l'écoulement sur les surfaces arrière des aubes sont réduits indépendamment de la forme des aubes, ce qui permet de réduire ainsi les pertes et d'augmenter la performance de toute la turbine. La paroi de bout (10) de grille d'aubes de turbine est positionnée du côté du moyeu et/ou du côté de la pointe des aubes (B) de turbine disposées annulairement. La paroi de bout de grille d'aubes de turbine a des premières projections (13) ayant chacune une crête diminuant d'abord doucement puis plus fortement finalement depuis le bord arrière d'une aube de turbine vers le côté aval, tout en s'étendant le long de la surface arrière d'une aube de turbine adjacente.

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