Accession Number : AD0444376


Title :   FLOW NOISE AND DRAG MEASUREMENTS OF VEHICLE WITH COMPLIANT COATING


Corporate Author : NAVAL ORDNANCE TEST STATION CHINA LAKE CA


Personal Author(s) : Nisewanger, C R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/444376.pdf


Report Date : Jul 1964


Pagination or Media Count : 26


Abstract : The forward portion of a buoyancy-propelled test vehicle was coated with 'Lamiflo,' a liquidfilled compliant rubber skin intended to reduce drag. Self-noise and drag measurements were compared with those of the bare vehicle. The coating increased the drag slightly and shifted the transition forward, possibly because of a surface irregularity. Self-noise in the 31.4-kc band was decreased with a filling liquid having a viscosity of 2,000 centipoise but was not decreased with water filling. Turbulent boundarylayer pressure fluctuation levels (measured under the skin) were generally lower than those of the bare body, and the lower frequencies were attenuated more with the high-viscosity liquid than with water.


Descriptors :   *TORPEDO MODELS , TEST METHODS , TURBULENT BOUNDARY LAYER , PRESSURE , INSTRUMENTATION , PIEZOELECTRIC TRANSDUCERS , DRAG , FRICTION , LAMINAR FLOW , RUBBER COATINGS , NOISE


Subject Categories : Test Facilities, Equipment and Methods


Distribution Statement : APPROVED FOR PUBLIC RELEASE