STEADY AND UNSTEADY LOADINGS AND HYDRODYNAMIC FORCES ON COUNTERROTATING PROPELLERS

The linearized lifting surface theory has been applied to the evaluation of blade loadings and resultant hydrodynamic forces and moments (thrust, torgue; bearing forces and bending moments) of counterrotating propeller systems with equal and unequal number of blades operating in uniform and nonuniform inflow fields both units rotating with the same RPM. The mathematical model takes into account as realistically as possible the geometry of the propulsive device, the mutual interaction of both units and the three-dimensional spatially varying inflow field. A computer program has been developed adaptable to high-speed digital computers (CDC 66700-7600) for counterrotating propulsion systems of equal and unequal blade number in uniform inflow for comparison with experimental results if available. (Author)

• Supplemental Notes:
  • Presented at the Symposium on Naval Hydrodynamics (11th), April 76, London (England).
• Corporate Authors:

  Stevens Institute of Technology

  Davidson Laboratory, Castle Point Station
  Hoboken, NJ  United States  07030
• Authors:
  • TSAKONAS, S
  • JACOBS, W R
  • Ali, M R
• Publication Date: 1976-4

Media Info

• Pagination: 13 p.

Subject/Index Terms

• TRT Terms: Aerodynamic lift; Blade loading; Contrarotating propellers; Mechanical loads; Wakes
• Old TRIS Terms: Lifting surface theory; Propeller loading; Wake surveys
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00142821
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: SIT-DL-76-1899
• Contract Numbers: N00014-67-A0202-0047, N00014-75-C-0483
• Files: TRIS
• Created Date: Dec 15 1976 12:00AM