Acoustic liners for turbine engines
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsMichael G Jones, Joseph E Grady, James D. Kiser, Christopher Miller, James D. Heidmann
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Abstract
An improved acoustic liner for turbine engines is disclosed. The acoustic liner may include a straight cell section including a plurality of cells with straight chambers. The acoustic liner may also include a bent cell section including one or more cells that are bent to extend chamber length without increasing the overall height of the acoustic liner by the entire chamber length. In some cases, holes are placed between cell chambers in addition to bending the cells, or instead of bending the cells.
Claims7
An acoustic liner, comprising:
- a plurality of cells, each cell having a length, configured to absorb or dampen acoustic waves;
- a predetermined noise spectrum comprising one or more frequencies for attenuation through absorption and dampening;
- and
- wherein one or more cell lengths is varied by interconnecting one or more adjacent cells through a hole in a common wall between the one or more adjacent cells to create a longer acoustic path length configured to absorb or dampen longer acoustic waves at lower frequencies, where each cell length can be tuned to attenuate a corresponding frequency of the predetermined noise spectrum.
Dependencies are inferred from the claim text.