The effect of the wind tunnel wall boundary layer on the acoustic testing of propellersAn approximation based on the representation of the boundary layer by lamina of uniform flow with suitable interlayer boundary conditions is shown to be accurate, efficient, and compatible with finite element formulations. The approximation has been implemented using existing codes to produce a model for assessing the suitability of the acoustic environment in a wind tunnel for the acoustic testing of propellers. It is found that, with suitable acoustic treatment and with measurements made near the propeller and well removed from the walls, the free field directivity and level can be reproduced with good fidelity.
Document ID
19890046366
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Eversman, Walter (Missouri-Rolla, University Rolla, United States)