Axial-flow or centrifugal fan - has auxiliary aerofoil slats at leading blade edges to reduce flow breakaway at low speed

摘要

The arrangement is intended for an axial-flow or a centrifugal fan with bladed impeller. To reduce break-away of the air flow from the blade surface at low circumferential speed, the blades are provided with auxiliary slats at their leading edges to form slotted aerofoils.