Gas turbine engine with variable overall pressure ratio
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United States of America Patent
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Jan 20, 2015
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app pub date -
Dec 9, 2011
filing date -
Dec 9, 2011
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Abstract
A gas turbine engine has a variable overall pressure rate (“OPR”). The engine includes a high pressure compressor having at least a primary stage having a set of primary rotors and a secondary stage having a set of secondary rotors. A clutch is provided to selectively engage the secondary rotors with the primary rotors. Engagement of the clutch may be controlled based on the vehicle travel mode, such as disengaging during a takeoff mode to reduce turbine entry temperature and engaging during a loiter mode to increase OPR.
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