Reduced noise fan stationary blade

Abstract

There are provided a negative lean angle θL of a direction opposite to a rotation direction in the vicinity of a hub, and a positive lean angle θL of the rotation direction in other regions on a chip side. The negative lean angle θL is −10°±3° in a high loss region in the vicinity of the hub, and the positive lean angle θL is 30°±3° on the chip side. Moreover, there is provided a positive sweep angle θs. The positive sweep angle θs is 20°±3° on the hub side, and is also 20°±3° on the chip side. Total pressure losses on both the hub and chip sides are reduced, noises can be reduced on both the hub and chip sides, and thereby noise reduction can be achieved without deteriorating aerodynamic capabilities.

Dependencies are inferred from the claim text.