THE GENERATION OF STEERING FORCES BY NONAXISYMMETRIC PROPELLER SHROUDS

An analytical procedure is developed for the design of a nonaxisymmetric shroud with a prescribed circumferential and chordwise pressure distribution in uniform flow. Computations are made for two shrouds; one designed to operate in uniform flow, and the other 'adapted' to an existing propeller. Model tests of both shrouds conducted in the MIT Variable Pressure Tunnel are analyzed. These measurements include forces on both shroud and propeller. The results indicate that large lift coefficients can be developed by such a device with lift/drag ratios superior to conventional rudders, and show good agreement with theoretically predicted lift. (Author)

• Corporate Authors:

  Massachusetts Institute of Technology

  Department of Ocean Engineering, 77 Massachusetts Avenue
  Cambridge, MA  United States  02139
• Authors:
  • Kerwin, J E
• Publication Date: 1972-11

Media Info

• Pagination: 45 p.

Subject/Index Terms

• TRT Terms: Aerodynamic lift; Boundary layer separation; Cavitation (Mechanics); Drag; Force; Performance; Propellers; Shrouded propellers; Steerable propellers; Steering; Vortices
• Uncontrolled Terms: Model tests
• Old TRIS Terms: Marine propellers; Marine surface propulsion; Propeller forces; Propeller performance; Shroud rings
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00047624
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: 72-18
• Contract Numbers: N00014-67A-0204-0449
• Files: TRIS
• Created Date: Oct 18 1973 12:00AM