Acoustic Core Assemblies with Mechanically Joined Acoustic Core Segments, and Methods of Mechanically Joining Acoustic Core Segments

    公开(公告)号:US20200109664A1

    公开(公告)日:2020-04-09

    申请号:US16150448

    申请日:2018-10-03

    IPC分类号: F02C7/045 G10K11/172 B32B3/12

    摘要: Acoustic core segments include splicing resonant cells that resemble a first segment of a whole resonant cell configured to overlap and align with counterpart splicing resonant cells of another acoustic core segment so as to define a splice joint. The splicing resonant cells include one or more fastening elements configured to couple with corresponding counterpart splicing resonant cells thereby together defining coupled resonant cells. Acoustic liners have an acoustic core assembly that includes a first acoustic core segment mechanically joined with a second acoustic core segment by a combination of splicing resonant cells of the first acoustic core segment overlapping and aligning with splicing resonant cells of the second acoustic core segment so as to define a splice joint, and a plurality of fastening elements coupling splicing resonant cells of the first acoustic core segment with splicing resonant cells of the second acoustic core segment.

    Durable riblets for engine environment

    公开(公告)号:US10107302B2

    公开(公告)日:2018-10-23

    申请号:US14964722

    申请日:2015-12-10

    摘要: An airfoil of a propulsion device having a first riblet laminate with a first adhesive layer on at least a first portion of the airfoil surface and a first riblet array sheet disposed on at least a portion of the first adhesive layer. The first riblet array sheet defines a first plurality of contiguous geometric features having rigid peaks and valleys extending in a first rib direction. The first plurality of contiguous geometric features define a total width to total height ratio W:H of about 1:1 to about 2.5:1 with a maximum total height of about 0.65 mm or less. A second riblet array laminate is also disclosed in an embodiment.