METHOD FOR INCREASING A BLADE PERFORMANCE (VARIANTS)

摘要

The invention relates to mechanical engineering, in particular to bladed machines for air pumping, in particular to fans and air blowers and to blades for different propelling devices. The inventive method for increasing a blade performance consists in producing a blade (1) in the from of a wing and in carrying out a boundary layer suction on the blade (1) surface on the opposite side with respect to the incoming flow through a system of slotted holes (4). The blade (1) is provided with a thick airfoil section. The air suction is carried out through the system of slotted holes (4) embodied along the blade (1) into cavities (5) which are embodied under said holes (4) along thereof and each of which is provided with a central longitudinal hollow body (6) arranged therein. Said body forms an annular channel (7) in each cavity (5) in such a way that a vortex current is produced by the incoming airflow therein. The air is sucked out from the cavities (5) and the central bodies (6) through branch channels (8) which are used for discharging air outside of the blade. The air flowing-off along the cavities (5) is limited inside the cavities (5) by baffles arranged therein and on the external surface of the blade (1) by rigs (9) mounted thereon. In another variant of the method, the cavity (5) is embodied without the central body (6). Said invention makes it possible to increase the blade performance.