REDUCED NOISE FAN STATIONARY BLADE

摘要

There are provided a negative lean angle .theta.L of a direction opposite to a rotation direction in the vicinity of a hub, and a positive lean angle .theta.L of the rotation direction in other regions on a chip side. The negative lean angle .theta.L is -10.degree.~3.degree. in a high loss region in the vicinity of the hub, and the positive lean angle .theta.L is 30.degree.~3.degree. on the chip sid e. Moreover, there is provided a positive sweep angle .theta.S. The positive sweep angle .theta.S is 20.degree.~3.degree. on the hub side, and i s also 20.degree.~3.degree. 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.