Variable pitch arrangement for a gas turbine engine

Details Variable pitch arrangement for a gas turbine engine Variable pitch arrangement for a gas turbine engine

1989-09-06

1990-11-06

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Having positive means for impeller adjustment

Power or manual actuator on non-rotatable part

416147, B64C 1132

Patent

active

049682172

ABSTRACT:
A variable pitch arrangement to enable reverse pitch settings of fan blades to be achieved without the leading and trailing edges of adjacent fan blades abutting each other comprises two sets of fan blades and two sets of actuators. The two sets of fan blades are rotatably mounted on the fan rotor, and arranged circumferentially on the fan rotor. The blades in the first set of fan blades are arranged alternately circumferentially with the blades in the second set of fan blades. There are equal numbers of blades in each set of fan blades. The two sets of actuators act independently of each other on the two sets of fan blades such that the pitch of the blades in the first set and the pitch of the blades in the second set are varied in a phased relation to prevent fouling of the blades. Initially one set of blades varies pitch quickly while the other set of blades varies pitch slowly, and then the first set of blades varies pitch slowly while the other set of blades varies pitch quickly.

REFERENCES:
patent: 3422625 (1969-01-01), Harris
patent: 3647320 (1972-03-01), Chilman et al.
patent: 3687569 (1972-08-01), Klompas
patent: 3720060 (1973-03-01), Davies et al.
patent: 3825370 (1974-07-01), McMurtry et al.
patent: 3870434 (1975-03-01), Paulson
patent: 3876334 (1975-04-01), Andrews
patent: 3893783 (1975-07-01), Keenan et al.
patent: 3901626 (1975-08-01), McMurtry
patent: 4047842 (1977-09-01), Avena et al.

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