What is it about?
The noise reduction performance of resonant acoustic liners deteriorates in the presence of airflow. We show that noise reduction performance can be maintained even in the presence of airflow when a fine-perforated film is attached to the liner surface with a small gap.
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Why is it important?
In aircraft engines, noise is reduced by attaching resonant acoustic liner panels inside the nacelle. However, it is said that, in the presence of airflow, the noise reduction performance of the liner is reduced due to the flow entering the liner opening. In this study, we found that a fine-perforated film can solve this problem.
Perspectives
This research has shown that attaching a fine-perforated film to the surface of a resonant acoustic liner can maintain noise reduction performance even under grazing flow, but the mechanism is not necessarily clear. In the future, we would like to clarify the mechanism through experimental research and numerical simulation, and propose more effective noise reduction measures.
Hirofumi Daiguji
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This page is a summary of: Acoustic Liners Combined with Fine Perforated Film, AIAA Journal, June 2024, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/1.j063239.
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