Swept fan blade

Details Swept fan blade Swept fan blade

1998-10-09

2000-06-06

Kwon, John

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

416DIG2, 416DIG5, F04D 2934

Patent

active

060710772

ABSTRACT:
A swept fan blade design for the low pressure compressor rotor or fan rotor stage of a ducted fan gas turbine engine has a leading edge swept forward near the hub up to a first radial height, then rearward up to second radial height and finally is swept forward again up to the blade tip. The aerodynamic effect is to produce a mid-height bias to the airflow enabling the tip region to be given increased twist and to possess increased resistance to foreign object damage. The design also provides a rear radial blade stacking axis to help reduce internal stresses due to centrifugal forces.

REFERENCES:
patent: 3989406 (1976-11-01), Bliss
patent: 4358246 (1982-11-01), Hanson et al.
patent: 4488399 (1984-12-01), Robey et al.
patent: 4726737 (1988-02-01), Weingold et al.
patent: 4790724 (1988-12-01), Bousquet et al.
patent: 5064345 (1991-11-01), Kimball
patent: 5249922 (1993-10-01), Sato et al.
patent: 5642985 (1997-07-01), Spear et al.

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