초록 ▼

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 windm

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.

대표청구항 ▼

A method of starting a turbofan engine of the type having a compressor and a Fan adapted to bypass a portion of the airflow around the compressor during engine operation and separate turbine means for driving the compressor and fan, comprising a. connecting a power generation means to said fan to de

A method of starting a turbofan engine of the type having a compressor and a Fan adapted to bypass a portion of the airflow around the compressor during engine operation and separate turbine means for driving the compressor and fan, comprising a. connecting a power generation means to said fan to derive energy therefrom during selective periods in which it is rotating; b. selectively connecting a motor means to said power generation means to derive energy therefrom during predetermined periods of operation; and c. connecting said motor means to said compressor to rotate it to a speed sufficient to allow a windmill start of the engine.