Turbofan arrangement
First Claim
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1. A bypass turbofan engine comprising:
- a first propulsion system comprising a first fan rotor, a core engine, a first low pressure turbine and a first fan shaft drivingly connecting the first turbine and the first fan rotor;
a second propulsion system comprising a second fan rotor drivingly connected to a second low pressure turbine via a second fan shaft, wherein in use a fluid drivingly flows through the first turbine then the second turbine, and wherein the first and second shafts are not coaxial with one another; and
a heat exchanger positioned between the first low pressure turbine and the second low pressure turbine, wherein said engine further comprising a compressor, a combustor and a valve, and wherein the heat exchanger is constructed and arranged to receive an airflow from the compressor such that the airflow may selectively be passed into the combustor by the valve.
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Abstract
A bypass turbofan engine comprises a first propulsion system and a second propulsion system. The first propulsion system comprises a first fan rotor, a core engine, a first low pressure turbine and a first fan shaft drivingly connecting the first turbine and the first fan rotor. The second propulsion system comprises a second fan shaft drivingly connecting to a second fan rotor and the first propulsion system and arranged so that the first and second shafts are not coaxial with one another.
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Citations
30 Claims
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1. A bypass turbofan engine comprising:
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a first propulsion system comprising a first fan rotor, a core engine, a first low pressure turbine and a first fan shaft drivingly connecting the first turbine and the first fan rotor; a second propulsion system comprising a second fan rotor drivingly connected to a second low pressure turbine via a second fan shaft, wherein in use a fluid drivingly flows through the first turbine then the second turbine, and wherein the first and second shafts are not coaxial with one another; and a heat exchanger positioned between the first low pressure turbine and the second low pressure turbine, wherein said engine further comprising a compressor, a combustor and a valve, and wherein the heat exchanger is constructed and arranged to receive an airflow from the compressor such that the airflow may selectively be passed into the combustor by the valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A bypass turbofan engine comprising:
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a first propulsion system comprising a first fan rotor, a core engine, a first low pressure turbine and a first fan shaft drivingly connecting the first turbine and the first fan rotor; a second propulsion system comprising a second fan rotor drivingly connected to a second low pressure turbine via a second fan shaft, wherein in use a fluid drivingly flows through the first turbine then the second turbine, and wherein the first and second shafts are not coaxial with one another; a heat exchanger positioned between the first low pressure turbine and the second low pressure turbine; and the core engine comprises, in flow sequence, a core compressor, a combustor and a core turbine, the core compressor is drivingly connected to the core turbine via the first fan shaft or a core shaft which is coaxial with the first fan shaft, wherein the engine is arranged so that the airflow from the core compressor flows through the heat exchanger and into the combustor, the fluid flow from the combustor drivingly flows through the core turbine, the first turbine and the heat exchanger thereby increasing the heat of the airflow from the core compressor to the combustor.
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26. A bypass turbofan engine comprising:
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a first propulsion system comprising a first fan rotor, a core engine, a first low pressure turbine and a first fan shaft drivingly connecting the first turbine and the first fan rotor; a second propulsion system comprising a second fan rotor drivingly connected to a second low pressure turbine via a second fan shaft, wherein in use a fluid drivingly flows through the first turbine then the second turbine, and wherein the first and second shafts are not coaxial with one another; a heat exchanger positioned between the first low pressure turbine and the second low pressure turbine; and the core engine comprises, in flow sequence, a core compressor, a combustor and a core turbine, the core compressor is drivingly connected to the core turbine via the first fan shaft or a core shaft which is coaxial with the first fan shaft, wherein a first valve is located upstream and adjacent the heat exchanger and a second valve is located between the core compressor and the combustor, the valves are operable to divert the compressor flow around the heat exchanger so that, in use, a desirable increase in engine power is achieved.
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27. A bypass turbofan engine comprising:
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a first propulsion system comprising a first fan rotor, a core engine, a first low pressure turbine and a first fan shaft drivingly connecting the first turbine and the first fan rotor; a second propulsion system comprising a second fan rotor drivingly connected to a second low pressure turbine via a second fan shaft, wherein in use a fluid drivingly flows through the first turbine then the second turbine, and wherein the first and second shafts are not coaxial with one another; a heat exchanger positioned between the first low pressure turbine and the second low pressure turbine; the core engine comprises, in flow sequence, a core compressor, a combustor and a core turbine, the core compressor is drivingly connected to the core turbine via the first fan shaft or a core shaft which is coaxial with the first fan shaft; and a first chamber and a second heat exchanger, the first chamber is located between and is in fluid communication with the first fan and the core compressor, the second heat exchanger is adjacent the first chamber and is arranged to receive fluid from the second compressor through the heat exchanger, and during operation cooling fluid from the first fan passes through the heat exchanger to cool the fluid from the second compressor so that the core compressor compresses the fluid more efficiently. - View Dependent Claims (28, 29, 30)
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Specification