Acoustic Forcing and Control of Reflected Waves in the Klebanoff-Saric Wind Tunnel
Conference Paper
Overview
Identity
Other
View All
Overview
abstract
The infrastructure of the Klebanoff-Saric Wind Tunnel is upgraded in anticipation of boundary layer sound receptivity experiments. Five speakers, installed inside the tunnel, create planar, downstream-traveling sound, and multiple microphones measure the sound output in the test section. The change in wind tunnel area downstream of the test section creates a reflected, upstream-traveling wave during acoustic forcing. An active noise control system uses two speakers downstream of the test section to create upstream-traveling waves that destructively interfere with the reflections. Active noise control reduces the reflections up to 42.3 dB at 10 m/s and 33.2 dB at 20 m/s with an average reduction of 28.6 dB at 10 m/s and 23.2 dB at 20 m/s. Active noise control is also used to reduce upstream-traveling tonal background noise up to 5.6 dB. The adaptive control system allows greater experimental control during sound receptivity experiments. 2012 by the Authors. Published by the American Institute of Aeronautics and Astronautics, Inc.
name of conference
28th Aerodynamic Measurement Technology, Ground Testing, and Flight Testing Conference
