Acoustic waves in a cylindrical duct with periodically varying cross section

• The null field approach is used to study the propagation of acoustic waves in a rotationally hard-walled duct with periodically varying cross section. For a radius that varies sinusoidally along the axial distance, numerical computations give the axial wave number and the passbands and stopbands of the modes of the duct. In particular, small passbands are seen to exist even for very large variations in radius, and probably all the way to the point where the duct is cut off. We also present some plots which show the pressure pattern inside the duct.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

Nyckelord

periodic cross section

duct

acoustics

Publikations- och innehållstyp

art (ämneskategori)

ref (ämneskategori)