Patent
Air-start assembly and method
TLDR
In this paper, a gear train is selectively operatively joined between the first and second shafts by selectively engaging a first clutch for transmitting torque through the first clutch only in one direction from the first shaft to the second shaft.Abstract:
A method and assembly are effective for air-starting an aircraft gas turbine engine having a fan powered by a low pressure turbine through a first shaft, and a compressor powered by a high pressure turbine through a second shaft disposed coaxially therewith. A gear train is selectively operatively joined between the first and second shafts by selectively engaging a first clutch for transmitting torque through the first clutch only in one direction from the first shaft to the second shaft when the fan is windmilling for driving the second shaft to allow an air-start of the gas turbine engine during flight. In a preferred embodiment, a second clutch is operatively joined to the gear train and is selectively engageable at speeds of the second shaft below a predetermined release speed, and disengageable at the release speed and above for disconnecting the air-start assembly once the engine has been started.read more
Citations
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Patent
Gas turbine engine system
Arnold Charles Newton,John Sharp +1 more
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Patent
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References
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Book
Aircraft Gas Turbine Engine Technology
TL;DR: Aircraft Gas Turbine Engine Technology provides a comprehensive, easy-to-understand treatment of the background, development, and applications of the gas turbine engine it its various forms, such as turobjet, turbofan, turboprop, and turboshaft powerplants as mentioned in this paper.
Patent
Method and apparatus for windmill starts in gas turbine engines
TL;DR: In this paper, 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.
Patent
Apparatus for windmill starts in gas turbine engines
TL;DR: In this article, a torque converter is interconnected between the fan and core rotor of a turbofan engine such that the speed of the core rotor can be boosted from windmill speed to a speed sufficient to allow an in-flight start by selectively extracting power from the windmilling fan during the start sequence of the engine.
Patent
Turbopropeller or turbofan gas turbine engine
TL;DR: In this paper, a turbopropeller or turbofan, gas turbine engine comprising a single spool core engine arranged to drive a propeller or a fan via gear means was provided with a starter motor, and a clutch means.