Modelling of Wind Tunnel Wall Effects on the Radiation Characteristics of Acoustic Sources
Abstract
An important analytical result shows that it is not possible to obtain an accurate directivity in the tunnel environment unless the modal cut off ratio for the source exceeds unity for at least the lowest order mode generated. This result is verified numerically. Acoustic fields and their corresponding directivities in the wind tunnel and free field are compared for situations in which the cut-off condition is satisfied. Several propeller operating conditions and tunnel Mach numbers of M equals 0. 0 and M equals minus 0. 5 are investigated to determine if the number of cut-on modes or the mean flow convective effects have a significant influence on the matching of the tunnel and free field directivities.
Recommended Citation
W. Eversman and K. J. Baumeister, "Modelling of Wind Tunnel Wall Effects on the Radiation Characteristics of Acoustic Sources," AIAA Paper, American Institute of Aeronautics and Astronautics (AIAA), Jan 1984.
Meeting Name
AIAA Paper (1984, Williamsburg, VA, USA)
Department(s)
Mechanical and Aerospace Engineering
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 1984 American Institute of Aeronautics and Astronautics (AIAA), All rights reserved.
Publication Date
01 Jan 1984
