WAKE AND PROPELLER TESTING

The Author, of the HSVA (the Hamburg Ship Model Basin), discusses the methods used in model-testing facilities for investigating the interactions between hulls and propellers in simulated wake-fields, and examines in detail the problems involved. After a brief introduction in which the need for such investigations is explained, the paper is arranged under the headings:--The Wake; Scale Effects of Wake; Scale Effect on the Velocity Distribution in the Propeller Plane; Tangential and Radial Component of the Wake; The Parameters on which the Propeller Characteristics in Non-Uniform Flow Depend; Scale Effect of Pressure Distribution and Cavitation of Propeller Blade Sections; Techniques for Simulating Ship-Wakes in Model Testing Facilities; Froude Scaling; Nuclei Spectra; New Instrumentation for Wake Simulation Problems. Under this last heading, the Author discusses LASER velocimetry and its usefulness for the measurement of velocity distribution in planes ahead and astern of a rotating model of full-scale propeller without disturbing the flow. A LASER velocimeter system in the medium-size cavitation tunnel at the HSVA is briefly described, and a sample of results obtained with it is presented which clearly show the variation of the axial velocity behind the individual blades of the propeller. Other results, from a towing tank elsewhere, are also included and show axial wake distributions obtained with a LASER velocimeter. In a brief conclusion to the paper, it is mentioned that, despite wonderful new instruments with on-line data analysing equipment, there remains much hard work to be done before we can answer all the questions concerning propeller/hull interactions. Order from BSRA as No. 53,396.

• Supplemental Notes:
  • From the Proceedings of the Stone Manganese Marine/Newcastle University Conference "Model Experiments as an Aid to Advanced Propulsion", 24-27 September 1979.
• Corporate Authors:

  Newcastle upon Tyne University, England

  Claremont Tower, Claremont Road
  Newcastle NE1 7RU, Tyne and Wear,   England 
• Authors:
  • Rader, H P
• Publication Date: 1979

Media Info

• Features: References;
• Pagination: 18 p.

Subject/Index Terms

• TRT Terms: Cavitation; Cavitation erosion; Container tanks; Hulls; Lasers; Pressure; Propellers; Simulation; Towing devices; Velocimeters; Velocity; Wakes
• Uncontrolled Terms: Pressure distribution; Scale effect
• Old TRIS Terms: Hull propeller interaction; Model testing; Propeller wake; Simulated wake; Towing tanks; Velocity distribution; Wake analysis
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00316698
• Record Type: Publication
• Source Agency: British Ship Research Association
• Report/Paper Numbers: Paper No. 4 Conf Paper
• Files: TRIS
• Created Date: Oct 8 1980 12:00AM