Abstract
The demand for noise control within ducts advances the development of the liner design. Recently, the mode merging thought, originating from the Cremer concept for the optimal impedance of locally reacting liners, was extended to the bulk liner design by the authors and thus the Mode-merging Design Method (MMDM) was proposed. The current research is a continuation of the previous work to systematically investigate the acoustic optimality of bulk liners with porous material protected by a large-porosity faceplate based on the MMDM. The optimal transmission loss (TL) is focused on, along with the optimal chamber depth and flow resistivity of the porous material, in the parameter spaces spanning the Helmholtz number, the circumferential mode order and the Mach number. Besides, the effect of different faceplates on the optimality is investigated briefly. Some interesting conclusions are drawn and expected to be beneficial to the bulk liner design.
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