Ram air turbine with secondary governor

Details Ram air turbine with secondary governor Ram air turbine with secondary governor

1994-11-18

1996-01-30

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Impeller rotation speed responsive

416 50, 416 52, 416 53, F01D 702

Patent

active

054876451

ABSTRACT:
A ram air turbine is provided for use in driving electric and/or hydraulic power systems in an aircraft, wherein the ram air turbine includes primary and secondary speed control governors. The primary governor includes centrifugal flyweights for cam-actuated adjustment of the pitch angle of a turbine blade or blades, within a selected adjustment range, to achieve substantially constant turbine speed in response to varying air speed and/or load. The secondary governor preloads the turbine blade or blades to a selected midrange pitch angle in the at-rest condition, wherein the midrange pitch angle is chosen for faster turbine acceleration on deployment to the desired full-speed rotation. The secondary governor controls blade pitch angle until the turbine reaches a selected rotational speed, after which the primary governor regulates and adjusts blade pitch angle within the selected adjustment range.

REFERENCES:
patent: 2382229 (1945-08-01), Humphreys
patent: 2876847 (1959-03-01), Blackburn et al.
patent: 4411596 (1983-10-01), Chilman
patent: 4743163 (1988-05-01), Markunas et al.
patent: 5249924 (1993-10-01), Brum

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