Deterministic Model of AcousticWave Propagation in a Cavity

Conference paper (2019)

Authors

Colin VanDercreek Aircraft Noise and Climate Effects - Aerospace Engineering
P. Sijtsma Aircraft Noise and Climate Effects - Aerospace Engineering
M. Snellen Aircraft Noise and Climate Effects - Aerospace Engineering
D. Ragni Wind Energy - Aerospace Engineering
F. Avallone Wind Energy - Aerospace Engineering
D.G. Simons Aircraft Noise and Climate Effects - Aerospace Engineering
Research Group
Aircraft Noise and Climate Effects (Aerospace Engineering) (TU Delft)
Copyright: © 2019 Colin VanDercreek, P. Sijtsma, M. Snellen, D. Ragni, F. Avallone, D.G. Simons
DOI: https://doi.org/10.2514/6.2019-2425
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Published Date

2019

Language

English

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Faculty

Aerospace Engineering

Department

Control & Operations

Research Group

Aircraft Noise and Climate Effects

Abstract

A mathematical model is proposed that evaluates acoustic propagation of turbulent boundary layer waves on top of a cavity enclosing a microphone. The goal is to optimize these cavity geometries to improve the signal-to-noise ratio of acoustic measurements. This model predicts the attenuation of the turbulent boundary layer fluctuations propagating within the cavity for a given wind tunnel speed, porous surface resistance and cavity geometry. Duct acoustics predict that the spatial wave numbers of the turbulent boundary layer pressure fluctuations are shorter than the acoustic wavelength and are therefore evanescent in the cavity. These cavities are also covered with a porous material such as a metallic mesh or kevlar, to attenuate hydrodynamic fluctuations through the cavity. This model supports the investigation of 3D cylindrical cavities and incorporates both soft and hard cavity walls. Good agreement was found with experimental data.

Files

6.2019_2425.pdf
(pdf | 0.473 Mb)