Reduced noise fan stationary blade

F - Mech Eng,Light,Heat,Weapons – 01 – D

Patent

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Details

F01D 5/14 (2006.01) F01D 5/10 (2006.01) F02K 3/06 (2006.01)

Patent

CA 2407702

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°~3° in a high loss region in the vicinity of the hub, and the positive lean angle .theta.L is 30°~3° on the chip side. Moreover, there is provided a positive sweep angle .theta.S. The positive sweep angle .theta.S 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.

L'invention concerne une aube fixe de soufflante à faible bruit, où un angle oblique négatif theta L en direction opposée au sens de rotation est à proximité du moyeu, et un angle oblique positif theta L dans le sens de rotation se trouve à l'autre extrémité. L'angle oblique négatif theta L est de 10 DEG +/- 3 DEG dans une haute zone de perte proche du moyeu et l'angle oblique positif theta L est de 30 DEG +/- 3 DEG à l'extrémité. Cette aube a un angle de flèche positif theta s de 20 DEG +/- 3 DEG côté moyeu et de 20 DEG +/- 3 DEG côté extrémité, une perte de pression totale sur les deux côtés, moyeu et extrémité, pouvant être ainsi réduite. Le bruit peut être diminué sur ces deux côtés sans affaiblir la performance aérodynamique.

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