PROPELLER-INDUCED VELOCITY FIELD DUE TO THICKNESS AND LOADING EFFECTS

The effect of thickness on the vibratory velocity field around the propeller is studied by means of the "thin body" approach, where the blade section is represented by a source-sind distribution of strength proportional to the slope of the blade thickness distribution. A numerical procedure is devised and adapted to the CDC-6600 high-speed digital computer for the evaluation of the thickness effect on the velocity field. The total propeller-induced velocity field is then obtained by adding the computed velocity computed velocity components due to thickness, with proper phase, to the results due to propeller loading calculated by means of the lifting surface theory. Set of calculations performed a 3-blade propeller operating in a 3-cycle screen-generated wake and for a 5-blade propeller operating in a realistic hull wake reveal that the effect of thickness in forming the components of the resultant velocity varies from moderate to large depending on the magnitude of the thickness distribution, on the location of the field point and on the intensity of the nonuniformity of the inflow field.

• Corporate Authors:

  Stevens Institute of Technology

  Davidson Laboratory, Castle Point Station
  Hoboken, NJ  United States  07030
• Authors:
  • JACOBS, W R
  • TSAKONAS, S
• Publication Date: 1973-7

Media Info

• Features: References;
• Pagination: 25 p.

Subject/Index Terms

• TRT Terms: Cavitation noise; Propellers; Vibration
• Old TRIS Terms: Propeller vibration
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00050999
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: SIT-DL-73-1681
• Files: TRIS
• Created Date: Feb 20 1974 12:00AM