CALCULATION OF INLET FLOWS BY MEANS OF A CLOSED VORTICITY DISTRIBUTION APPLIED TO DUCTED PROPELLERS

The investigation concerns inlet flow calculations applied to ducted propellers. The analysis is classified as that of an inlet flow since the ducted propeller wake is assumed to be at a constant diameter. A closed distribution of ring vortices is used to describe the duct and wake. By forming a closed distribution, the velocity can be equated directly to the vorticity. With this representation, singular integral equation of the first kind is formulated for the vorticity in terms of the streamline enclosing the duct and wake. Several techniques incorporated in the numerical solution of this integral equation are presented. This analysis provides a needed solution for ducted propellers operating at low speeds and statically, as well as at high speeds. (Author)

• Corporate Authors:

  University of Massachusetts, Amherst

  School of Engineering
  Amherst, MA  United States 
• Authors:
  • Weetman, R J
  • Cromack, D E
• Publication Date: 1972-12

Media Info

• Pagination: 106 p.

Subject/Index Terms

• TRT Terms: Confined flow; Ducted propellers; Shrouded propellers; Vortices; Wakes
• Old TRIS Terms: Vortex theory; Wake analysis
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00044240
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: UM-72-11
• Contract Numbers: N00014-68-A-0146
• Files: TRIS
• Created Date: May 11 1973 12:00AM