Aeroacoustic Source of a Shallow Cavity in a Pipeline

The flow-induced acoustic source of an axisymetric shallow cavity, coupled to longitudinal acoustic modes in a pipeline is characterized experimentally for circular pipes conveying fully developed turbulent flow. This aeroacoustic source is generated due to the interaction of the cavity shear layer oscillation with the resonant acoustic field in the pipe. The distributed aeroacoustic source is modeled by a lumped acoustic dipole source which is dependent on the Strouhal number and the acoustic particle velocity at the cavity. The amplitude and phase of this source are determined experimentally and presented in the form of a dimensionless complex source term.Copyright © 2011 by ASME