Accession Number : AD0427410


Title :   FLOW NOISE OF STREAMLINED BODIES FALLING FREELY IN WATER,


Corporate Author : NAVY ELECTRONICS LAB SAN DIEGO CALIF


Personal Author(s) : Laitinen,P O


Report Date : 19 Sep 1963


Pagination or Media Count : 90


Abstract : Sound pressure fluctuations were measured by single hydrophones imbedded in streamlined, plastic, laminar flow bodies about 10 inches long and with trailing cables while the bodies dropped through water at Lake Pend Oreille, Idaho. The pressure levels approximated those of the ambient noise measured with the bodies submerged at rest, unless the body boundary layers were intentionally tripped into turbulence by tripping wires. Relative broadband pressure values and relative pressure spectra were derived and are explained along with applicable flow noise theory. (Author)


Descriptors :   *FREE FALL MODELS , *UNDERWATER SOUND , UNDERWATER , NOISE , HYDRODYNAMIC CONFIGURATIONS , HYDROPHONES , INSTRUMENTATION , BOUNDARY LAYER , PRESSURE , VELOCITY , NOISE ANALYZERS , FLUID FLOW , TURBULENCE , FLUID MECHANICS , TURBULENT BOUNDARY LAYER , CONICAL BODIES , MODEL TESTS


Distribution Statement : APPROVED FOR PUBLIC RELEASE