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Interior Duct Wall Pressure Downstream of a Low-Speed Scott C. Morris

Summary: Interior Duct Wall Pressure Downstream of a Low-Speed
Scott C. Morris
, David B. Stephens
, Thomas D. Economon
, William K. Blakež
University of Notre Dame, Notre Dame, Indiana, 46556 USA
The region downstream of a ducted rotor has been experimentally investigated in terms
of its wake characteristics and the duct wall pressure fluctuations. The motivation for the
measurements was to document and understand the sources of structural excitation that
would lead to shell vibration. The wake measurements indicated a swirling hydrodynamic
flow field that decayed rapidly in the streamwise direction. The interior duct wall pressure
similarly indicated strong decay in the fluctuation levels in the streamwise direction. The
spectral features of the wall pressure at various speeds and axial positions were described,
and found to be influenced by the relative interactions of the blade rate harmonics and the
duct cut-on modes. A circumferential modal analysis was used to describe the specific
features of the hydrodynamic and acoustic pressure components.
I. Introduction
HE prediction of sound generated by turbomachines operating within a cylindrical duct represents one of the
canonical aeroacoustic problems. A significant source of radiated sound can be structure-borne when the duct


Source: Alonso, Juan J. - Department of Aeronautics and Astronautics, Stanford University


Collections: Engineering