Jet‐Noise Reduction through Liquid‐Base Foam Injection
作者:
Lidia Manson,
H. L. Burge,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1971)
卷期:
Volume 50,
issue 4A
页码: 1067-1074
ISSN:0001-4966
年代: 1971
DOI:10.1121/1.1912730
出版商: Acoustical Society of America
数据来源: AIP
摘要:
An experimental investigation has been made of the sound‐absorbing properties of liquid‐base foams and of their ability to reduce jet noise. Protein, detergent, and polymer foaming agents were used in water solutions. A method of foam generation was developed to permit systematic variation of the foam density. The investigation included measurements of sound‐absorption coefficients for both plane normal incidence waves and diffuse sound fields. The intrinsic acoustic properties of foam, e.g., the characteristic impedance and the propagation constant, were also determined. The sound emitted by a 1‐in.‐diam cold nitrogen jet was measured for subsonic (300 m/sec) and supersonic (422 m/sec) jets, with and without foam injection. Noise reductions up to 10 PNdB were measured.
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