Curved blade turbomachinery noise reduction

Details Curved blade turbomachinery noise reduction Curved blade turbomachinery noise reduction

F - Mech Eng,Light,Heat,Weapons

02

K

60/103, 60/75

F02K 1/00 (2006.01) F01D 5/14 (2006.01)

Patent

CA 1069321

CURVED BLADE FOR TURBOMACHINERY NOISE REDUCTION Abstract A turbomachinery stage comprising two axially spaced blade rows, one of which is rotatable, wherein the blades of the upstream row are contoured to present a leaned wake to the downstream row. In the preferred embodiment, the blades of the upstream row extend radially from a central hub and, at a radius above the hub, are physically curved circumferentially from a radial line through the hub. The physical lean locally complements the inherent aerodynamic lean at each radius such that the integrated acoustic power of the stage is essentially at a minimum, thus maximizing the acoustic attenuation, Preferably, the constraint is imposed that the blade physical curvature is essentially smooth, continuous and without an inflection point.

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