US 12,448,935 B2
Low-frequency acoustic center body
Jose S. Alonso-Miralles, Chula Vista, CA (US); and Ryan M. Robinson, San Diego, CA (US)
Assigned to Rohr, Inc., Chula Vista, CA (US)
Filed by ROHR, INC., Chula Vista, CA (US)
Filed on Sep. 13, 2024, as Appl. No. 18/885,392.
Application 18/885,392 is a division of application No. 18/420,473, filed on Jan. 23, 2024, granted, now 12,116,955.
Application 18/420,473 is a division of application No. 17/473,817, filed on Sep. 13, 2021, granted, now 12,078,125, issued on Sep. 3, 2024.
Prior Publication US 2025/0003374 A1, Jan. 2, 2025
Int. Cl. F02K 1/82 (2006.01); B64D 33/02 (2006.01); F02K 1/04 (2006.01); F02K 1/44 (2006.01); G10K 11/172 (2006.01)
CPC F02K 1/827 (2013.01) [F02K 1/04 (2013.01); F02K 1/44 (2013.01); B64D 2033/0206 (2013.01); F05D 2230/54 (2013.01); F05D 2230/60 (2013.01); F05D 2240/1281 (2013.01); F05D 2250/183 (2013.01); F05D 2250/191 (2013.01); F05D 2250/314 (2013.01); F05D 2250/38 (2013.01); F05D 2250/75 (2013.01); F05D 2260/963 (2013.01); G10K 11/172 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A center plug for attenuating noise in a gas turbine engine, comprising:
an inner skin, the inner skin having a substantially cylindrical shape and extending along an axial centerline;
an outer skin positioned radially outside the inner skin;
a forward bulkhead disposed proximate a forward end of the inner skin, the forward bulkhead connected to and extending radially outward from the inner skin;
an aft bulkhead disposed proximate an aft end of the inner skin, the aft bulkhead connected to and extending radially outward from the inner skin; and
an acoustic panel disposed within a volume defined by the inner skin, the outer skin and the forward bulkhead and the aft bulkhead, the acoustic panel including:
a resonator cavity comprised of a plurality of sub-cavities extending axially along the axial centerline and circumferentially about the axial centerline, the plurality of sub-cavities including a first sub-cavity, a second sub-cavity, and a third sub-cavity, the first sub-cavity being separated from the second sub-cavity in a circumferential direction by a first perforated wall, the second sub-cavity being separated from the third sub-cavity in the circumferential direction by a second perforated wall,
a first perforated surface extending in an axial direction and through the outer skin and into the first sub-cavity,
a non-perforated surface extending in the axial direction and covering the second sub-cavity, and
a second perforated surface extending in the axial direction and through the outer skin and into the third sub-cavity,
wherein the second perforated surface is spaced in the circumferential direction from the first perforated surface by the non-perforated surface.