Investigation to Study the Aerodynamic Ship Wake Turbulence Generated by a DD963 Destroyer.
Final rept. Apr 78-Aug 79,
BOEING VERTOL CO PHILADELPHIA PA
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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 180 scale DD 963 destroyer model. Early flow visualization work employing smoke and heliumsoap 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
- Marine Engineering