Perforated wall noise in the AEDC-PWT 16-ft and 4-ft transonic tunnels /
O.P. Credle.

Description

Main Author

Credle, O. P.

Related Names

ARO, Inc.
Arnold Engineering Development Center
United States. Air Force.

Language(s)

English

Published

Arnold Air Force Base, Tennessee : Arnold Engineering Development Center, Air Force Systems Command, United States Air Force, 1971.

Subjects

Wind tunnels > Wind tunnels / Noise.
Wind tunnel walls.
Transonic wind tunnels.

Summary

The report presents the results of recent studies of noise in Propulsion Wind Tunnel (16T) and Aerodynamic Wind Tunnel (4T). Noise levels in the free stream and at the test section wall were measured in both tunnels as a function of Mach number, Reynolds number, wall angle, and wall porosity. In Tunnel 4T, free-stream noise characteristics were also evaluated with solid (taped) test section walls. Test results revealed that the perforated test section wall holes generate discrete frequency, high energy noise. In Tunnel 16T, there is a critical Mach number range in which a wall hole frequency. Test section noise levels were found to vary slightly with wall angle and significantly with Mach number and wall porosity. The wall porosity corresponding to the minimum noise levels was found in Tunnel 4T. (Author).

Note

Report was prepared by ARO, Inc., a subsidiary of Sverdrup & Parcel and Associates, Inc.
Final Report: September 1969 to December 1970."
"October 1971."

Physical Description

71 pages : illustrations ; 28 cm

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