Outer culvert electric drive variable cycle turbofan engine

By installing motors and outer culvert fans in variable cycle turbine engines, the coordinated work between the motor and outer culvert fans is solved, and the problem of insufficient impact of the power-electric conversion on thermal cycles in the existing technology is achieved, and the efficient matching of thermal "change" and "conversion" under multiple operating conditions is achieved, which improves the thrust of the engine and the installation performance of the aircraft.

CN119712347AActive Publication Date: 2025-03-28XIAMEN UNIV
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Patent Information

Application Number
CN202411967827.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-03-28
Estimated Expiration
2044-12-30

AI Technical Summary

Technical Problem

The existing variable cycle turbine engines have not yet fully considered the impact of functional electric conversion on thermal cycles, and it is difficult to achieve efficient matching of thermal "variable circulation" and functional electric "transformation" under multiple operating conditions.

Method used

The motor is installed on the low-pressure shaft of the dual-rotor hybrid turbofan engine, and the third duct is expanded behind the intake passage, and an outer duct fan is arranged. Through the coordinated work of the motor and the outer culvert fan, the core shaft work is extracted at the subsonic state and converted into electrical energy to increase the bypass ratio. In the ultrasonic state, the excess captured by the intake channel is used to flow to drive the fan to generate electricity, and the electrical energy is reversed to the engine's low voltage shaft.

Benefits of technology

It realizes efficient matching of thermal cycles and work-electric conversion under multiple operating conditions, reduces fuel consumption, increases engine thrust, and improves the installation performance and advance matching characteristics of the aircraft.

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Abstract

The invention discloses an outer culvert electrically-driven variable-cycle turbofan engine, and relates to aviation turbine engines. In combination with an air inlet channel, a fan, a high-pressure compressor, a combustion chamber, a turbine, a mixing chamber, a spray pipe and other components of the reference double-rotor mixed-exhaust turbofan engine, a motor, an outer culvert fan, electric equipment and an outer culvert spray pipe are additionally arranged. By optimizing thermodynamic cycle and power-electricity conversion, the engine can achieve thermodynamic'variable cycle 'under different working conditions, and extra electric energy is provided for an aircraft. During subsonic flight, the motor drives the outer culvert fan by using the work of the core crankshaft, so that the bypass ratio is increased, the oil consumption is reduced, and the thrust is improved. During supersonic flight, redundant air drives a fan to generate electricity, electric energy is supplied to a low-pressure shaft of an engine, and turbine power and overflow resistance of an air inlet channel are reduced. The design is small in change, high in feasibility, capable of effectively improving the engine installation thrust, reducing the oil consumption rate and achieving efficient energy utilization, and suitable for various flight conditions.
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