Design and Verification of Seamless Intake Acoustic Liners for Business Jet Class Turbofan Engines

This paper describes recent research activities carried out by GKN Aerospace and Honeywell Aerospace to design, fabricate and test zero-splice intake acoustic liners. A comparative assessment of the performance of two different zero-splice intake acoustic liner concepts is presented. Demonstrators for a Seamless Single-Degree of Freedom (SDOF) Linear liner and a Seamless Double-Layer Liner were designed and manufactured at GKN Aerospace. Far field static engine noise tests were conducted at Honeywell's Acoustic Test Facility in San Tan, Arizona, to evaluate the effectiveness of the liners and their benefit to aircraft community noise reduction.