Study on Attenuation of Sound by Droplets
Abstract
Attenuation of sound by water droplets in air is analytically investigated. This is one of the mechanisms of the noise reduction in actual rocket launch where water is injected to jet plume. The scattering and absorption by the droplets are considered as the attenuation mechanisms. It is found that the absorption is superior to the scattering for fine droplets, such as fog or mist. Then we estimate the attenuation of sound for the experiment using subscale solid rocket motors. The result agrees well with the experimental data within the frequency range where the assumptions of this study are valid.
- Publication:
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Japan Society of Aeronautical Space Sciences
- Pub Date:
- 2009
- DOI:
- 10.2322/jjsass.57.71
- Bibcode:
- 2009JSASS..57...71S
- Keywords:
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- Fluid Dynamics;
- Sound Attenuation;
- Multi-Phase Flow