| 摘要 |
PROBLEM TO BE SOLVED: To develop a device capable of attenuating noises of a fan and maintaining the aerodynamic performance and the mechanical integrity without increasing the mass. SOLUTION: The present invention relates to a structural or non-structural turbojet engine fan casing connecting arm (8B) that also acts as a flow straightener downstream of a fan rotor (3). A distinctive feature of the arm is that it is constructed in such a way as to form an acoustic attenuator. In particular, the arm comprises a closed cavity and perforations (83) on one of the faces (8Bin, 8Bex) so as to form a Helmholtz resonator. The arm forms part of an intermediate casing (8). COPYRIGHT: (C)2008,JPO&INPIT
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