Accession Number:

AD0436677

Title:

THE PHYSICAL PICTURE OF FLOW NOISE,

Descriptive Note:

Corporate Author:

ADVISORY GROUP FOR AERONAUTICAL RESEARCH AND DEVELOPMENT PARIS (FRANCE)

Report Date:

1963-04-01

Pagination or Media Count:

37.0

Abstract:

The study of flow noise is based on exact computation, on model studies, and on statistical analysis. Measurements were performed in the water tunnel and with the aid of buoyant units. The effect of surface roughnesses was studied with a rotating cylinder. Special attention is given to radiated noise, since hydrophones used in underwater acoustics are relatively large and record the radiation noise only. Flow noise was reduced by tripping the boundary layer by coating the surface with sound-absorbent varnishes. It seems probable that flow noise can be reduced by reducing wall vibrations. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE