Methods for Controlling the Sideforce on Surface-Piercing Hydrofoil Struts
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP PERFORMANCE DEPT
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Possible means of reducing the sideforce due to sideslip angle on a surface-piercing hydrofoil strut were investigated. An experimental program was performed to test the effect on strut sideforce and ventilation characteristics of 50-percent chord trailing edge flaps, midchord spoilers split flaps, and airbleed air injection. The effect of fences was tested in combination with the trailing edge flap and airbleed. All systems were found to be effective in reducing or changing sideforce. Airbleed and spoilers reduced the abruptness of transition to the ventilated state under certain circumstances. Power requirements were evaluated for the case of flapped struts. Fences slightly increased drag, and had a smoothing influence on transition between ventilated and unventilated flow states.
- Marine Engineering
- Fluid Mechanics