SOME INVESTIGATIONS ON PROPELLER OPEN-WATER CHARACTERISTICS FOR ANALYSIS OF SELF-PROPULSION FACTORS

The selection of propeller characteristics for the analysis of self-propulsion test result is one of the most important problems to be solved when standardising model/ship correlation. Two methods are widely used: (1) To use the propeller open-water characteristics at the same Reynolds number as in the self-propulsion tests. (2) To use the propeller open water characteristics at the standard Reynolds number. To find which was preferable, the boundary-layer flow on propeller blades was examined, both in open-water and behind conditions by using the oil-film method. Results showed that method (1), which is that used by the Nagasaki Experimental Tank, was rather better than (2), even though the turbulent boundary layer area on the blades was a little larger in behind condition than in open-water condition at the same Reynolds number. However, owing to the complexity of the flow track pattern in the oil film, it was difficult to reach a definite conclusion. Turbulence stimulators were used during the test to ensure that some boundary-layer flow on the propeller blades during the open-water and self-propulsion tests; further investigations are needed however to reduce the drag of the turbulence stimulators before adopting them as routine practice. Order from: BSRA as No. 46,891.

• Corporate Authors:

  Mitsubishi Heavy Industries Limited

  5-1 Marunouchi, 2-chome, Chiyoda-Ku
  Tokyo 100,   Japan 
• Authors:
  • Tamura, K
  • Sasajima, T
• Publication Date: 1977-3

Media Info

• Pagination: 12 p.
• Serial:
  • Mitsubishi Heavy Industries Technical Bulletin
  • Issue Number: 11
  • Publisher: Mitsubishi Heavy Industries Limited

Subject/Index Terms

• TRT Terms: Boundary layer; Boundary layer flow; Open water; Propeller blades; Propellers; Reynolds number; Tests; Turbulence; Turbulent boundary layer
• Old TRIS Terms: Propeller characteristics; Self propulsion
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00170174
• Record Type: Publication
• Source Agency: British Ship Research Association
• Report/Paper Numbers: No. 119
• Files: TRIS
• Created Date: Mar 7 1978 12:00AM