Turbomachine with unducted propellers

a turbomachine and propeller technology, applied in the direction of machines/engines, air-flow influencers, transportation and packaging, etc., can solve the problems of reducing the thrust produced by the downstream propeller, the noise generated by the turbomachine when operating, and the turbomachine must comply with relatively severe acoustical certification standards. , to achieve the effect of simple, effective and economical
US20100054913A1Inactive Publication Date: 2010-03-04SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
Publication Date
2010-03-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

Turbomachine, comprising two external coaxial and contra-rotating unducted propellers (122, 124), at least some of the blades (148) of the upstream propeller comprising substantially radial internal shafts for air circulation (150) communicating with air tapping orifices (152) in the boundary limits of the blades, and at their radially external ends with air outlet orifices (158).
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Description

[0001] This invention relates to a turbomachine of the unducted propeller type.BACKGROUND OF THE INVENTION

[0002] A turbomachine of this type comprises two contra-rotating and coaxial external propellers, respectively upstream and downstream, which are each secured in rotation to a turbine of the turbomachine and which extend substantially radially to the exterior of the nacelle of this turbomachine. This turbomachine has the advantage of being of high performance compared to other types of turbomachine because it consumes less fuel and because its contra-rotating propellers make it possible to provide a relative substantial thrust.

[0003] However, the major disadvantage with this type of turbomachine is the noise that it generates when operating. Yet, this turbomachine must comply with relatively severe acoustical certification standards, in particular during the take-off and landing phases of the aircraft provided with this turbomachine.

[0004] One of the sources of this noise is caused ...

Claims

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