Methods for Controlling the Sideforce on Surface-Piercing Hydrofoil Struts

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1976
Accession Number
ADA029456

Entities

People

  • David W Taylor
  • Michael F. Jeffers
  • Richard S. Rothblum
  • Russell P. Smith

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Air Flow
  • Air Supplies
  • Airfoils
  • Aspect Ratio
  • Control Systems
  • Flow
  • Flow Rate
  • Geometry
  • Hydrofoils
  • Measurement
  • Photographs
  • Pressure Distribution
  • Split Flaps
  • Surfaces
  • Tensile Strength
  • Trailing Edges
  • Two Dimensional

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Marine Propulsion Engineering and Naval Architecture