Accession Number : ADA083663


Title :   Investigation to Study the Aerodynamic Ship Wake Turbulence Generated by a DD963 Destroyer.


Descriptive Note : Final rept. Apr 78-Aug 79,


Corporate Author : BOEING VERTOL CO PHILADELPHIA PA


Personal Author(s) : Garnett,Theodore S , Jr


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a083663.pdf


Report Date : Oct 1979


Pagination or Media Count : 425


Abstract : A wind tunnel program was accomplished in the Boeing Vertol Low Speed VSTOL facility to evaluate airwake turbulence behind the hull and superstructure of a 1/80 scale DD 963 destroyer model. Early flow visualization work employing smoke and helium/soap bubble techniques identified (and photographed) areas of major turbulence in the lee of prominent superstructure elements. Grids of hot wire anemometer probes were then used to quantitatively map three component velocity levels at selected locations above, behind, and on either side of the ship; for remote wind speeds of 20, 35 and 45 knots with ship yaw angles varied from 0 deg. to 180 deg., and hull roll angle set at 0 deg. and 15 deg. right and left. Digital listings of mean and standard deviation velocity components were prepared from recorded time history tapes of the actual airwake turbulence. The principal application of these test results is expected to include synthesis of a Strouhal Scaled DD 963 airwake math model for helicopter and VSTOL flight simulation work, and formation of a data base for design of shipboard equipment to interface the vessel with its aircraft. (Author)


Descriptors :   *TURBULENCE , *WIND TUNNEL TESTS , *WAKE , *DESTROYERS , DATA BASES , MATHEMATICAL MODELS , PROBES , INTERFACES , GRAPHS , FLOW VISUALIZATION , HELICOPTERS , TABLES(DATA) , SHIP MODELS , SHIP HULLS , HOT WIRE ANEMOMETERS , VERTICAL TAKEOFF AIRCRAFT , SHORT TAKEOFF AIRCRAFT , SUPERSTRUCTURES


Subject Categories : Aerodynamics
      Helicopters
      V/STOL
      Marine Engineering


Distribution Statement : APPROVED FOR PUBLIC RELEASE