NASA NTRS · 19740024305
Noise suppressor
Abstract
A tuned noise suppressor is described consisting of annular acoustically porous elements for incorporation into the inlet and exhaust ducts of turbofan engines. The apparatus uses sound wave absorption, reflection, and incompatibility for achieving high noise reduction in the short distance. In addition, it has a duct of uniform inner diameter which does not block the duct flow.
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Zorumski, W. E.. 1974-08-20. Noise suppressor. https://ntrs.nasa.gov/citations/19740024305
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