Swirl guiding acoustic device with an internal coaxially integrated swirl guide structure

A coaxially integrated swirl guiding acoustic device, comprising

• an elongated annular housing extending around a longitudinal axis and including an axially extending outer wall;
• an inlet end on a first end of said housing receiving airflow into said device;
• an axially extending annular inner wall arranged coaxially with and radially spaced from said outer wall, said inner wall defining an interior open central region through which said airflow is conducted through said housing;
• at least one acoustic resonator chamber is enclosed between said inner and outer walls, said at least one acoustic resonator chamber operable to attenuate a desired sound frequency spectrum of sound carried in said conducted airflow,
• wherein said inner wall includes at least one aperture fluidically connecting and extending between said open central region and said at least one acoustic resonator chamber;
• an airflow swirl guiding structure coaxially arranged within said open central region and interior to said resonator, said structure comprising at least one swirl guiding element configured to modify swirl characteristics of said conducted airflow.