Blade group arrangement as well as turbomachine

摘要

A blade group arrangement for a turbomachine in order to form a blade-row group, whereby a front blade and a rear blade each form an overlapping area that has a contraction ratio of at least 1.2, and it also relates to a turbomachine having such a contraction ratio between a front blade and a rear blade.

主权项

1. A blade group arrangement for a turbomachine in order to form a blade-row group, comprising:
a front blade and a rear blade arranged offset from each other in the axial and circumferential directions and forming an overlapping area running between a pressure side of the front blade and a suction side of the rear blade, the front and rear blades in the overlapping area converging with a contraction ratio KV of KV≧1.2 between an inlet surface Dmin,1 defined as a smallest distance between a leading edge of the rear blade and the pressure side of the front blade, and an outlet surface Dmin,2 defined as a further smallest distance between the suction side of the rear blade and the pressure side of the front blade.