Crossflow fan and air conditioner provided with same

摘要

A crossflow fan is provided with a rotatable impeller formed of curved blades (42). Each blade (42) has an outer peripheral edge portion (43), which is in proximity to the centrifugal end of the impeller, and an inner peripheral edge portion (44), which is in proximity to the rotational center of the impeller. A plurality of notches (45) are formed at given intervals along the outer peripheral edge portion (43) of each blade (42). In a negative pressure surface (4q) of each blade (42), dimples (48) for causing transition of a boundary layer from laminar flow to turbulence flow are formed in the proximity to the outer peripheral edge portion (43) in order to prevent the gas flowing to the blade (42) from separating from the blade (42).