Method and apparatus for windmill starts in gas turbine engines

Details Method and apparatus for windmill starts in gas turbine engines Method and apparatus for windmill starts in gas turbine engines

1976-05-13

1977-12-13

Croyle, Carlton R.

Power plants

Reaction motor

Method of operation

60226R, 60 3914, 60 3916S, 60 3918C, 60242, F02K 306, F02K 312

Patent

active

040621855

ABSTRACT:
A hydraulic pump and drive system is interconnected between the fan and compressor rotor of a turbofan engine such that the windmill speed of the core rotor can be boosted to a speed sufficient to allow a significantly increased in-flight start envelope by selectively extracting power from the windmilling fan prior to relight of the engine. Control logic is included to decouple the motor and pump whenever the engine is in the operating speed region and to selectively couple the fan-driven hydraulic pump to auxiliary machinery such as the nozzle actuators to obtain a dual-purpose function from the pump.

REFERENCES:
patent: 2952973 (1960-09-01), Hall et al.
patent: 3488947 (1970-01-01), Miller et al.
patent: 3940926 (1976-03-01), Craig

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