Method and apparatus for windmill starts

Details Method and apparatus for windmill starts Method and apparatus for windmill starts

F - Mech Eng,Light,Heat,Weapons

02

C

60/57, 60/81

F02C 7/26 (2006.01)

Patent

CA 1096185

13DV-6680 METHOD AND APPARATUS FOR WINDMILL STARTS 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.

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