Gas turbine engine with noise attenuating variable area fan nozzle
First Claim
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1. A rotary-wing aircraft comprising:
- a rotor system;
a secondary propulsion system transverse to said rotor system;
a gas generator operable to generate combustion gases;
a first power turbine to receive said combustion gases from said gas generator, said first power turbine operable to drive said rotor system;
an outer duct downstream of said first power turbine;
an inner duct at least partially within said outer duct to define a bypass passage between said inner duct and said outer duct; and
a retractable port movable between a closed position and an open position to selectively control flow of said combustion gases into said bypass passage to change a power distribution between said rotor system and said secondary propulsion system, wherein said secondary propulsion system is a pusher propeller.
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Abstract
A rotary-wing aircraft includes a retractable port movable between a closed position and an open position to selectively control flow of combustion gases into a bypass passage to change a power distribution between a rotor system and a secondary propulsion system.
22 Citations
20 Claims
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1. A rotary-wing aircraft comprising:
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a rotor system; a secondary propulsion system transverse to said rotor system; a gas generator operable to generate combustion gases; a first power turbine to receive said combustion gases from said gas generator, said first power turbine operable to drive said rotor system; an outer duct downstream of said first power turbine; an inner duct at least partially within said outer duct to define a bypass passage between said inner duct and said outer duct; and a retractable port movable between a closed position and an open position to selectively control flow of said combustion gases into said bypass passage to change a power distribution between said rotor system and said secondary propulsion system, wherein said secondary propulsion system is a pusher propeller. - View Dependent Claims (2, 3, 4, 5, 6, 17, 19, 20)
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7. A rotary-wing aircraft comprising:
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a rotor system; a secondary propulsion system transverse to said rotor system; a first power turbine operable to drive said rotor system; a second power turbine downstream of said first power turbine, said second power turbine operable to drive said secondary propulsion system; and an exhaust system to couple and uncouple said second power turbine and said first power turbine to change a power distribution between said rotor system and said secondary propulsion system, wherein said secondary propulsion system is a pusher propeller. - View Dependent Claims (8, 9, 10, 11, 12, 13, 18)
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14. A rotary-wing aircraft comprising:
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a rotor system; a secondary propulsion system transverse to said rotor system; a gas generator operable to generate combustion gases; a first power turbine to receive said combustion gases, said first power turbine operable to drive said rotor system; an outer duct downstream of said first power turbine; a second power turbine downstream of said first power turbine, said second power turbine operable to drive said secondary propulsion system; an inner duct within said outer duct to define a bypass passage between said inner duct and said outer duct; and a retractable port movable between a closed position and an open position to selectively control flow of said combustion gases from said first power turbine into said bypass passage and change a power distribution between said rotor system and said secondary propulsion system, wherein said secondary propulsion system is a pusher propeller. - View Dependent Claims (15, 16)
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Specification