AN INVESTIGATION OF FLOW IMPROVEMENT DEVICES FOR REDUCING PROPELLER EXCITED VIBRATION

The first purpose of the investigationm described was to compare the effectiveness of triangular vortex generators and cambered rectangular planform flow deflectors for improving a poor wake flow to cure propeller excited vibration, and the second purpose was to compare the relative power penalties involved. The wakes were investigated in a wind tunnel where a foreshortened double model was used so that the flow corrective devices would be more correctly scaled relative to the local boundary layer thickness than they would have been on an undistorted model. Propulsion experiments on a similarly distorted floating model were then made in a towing tank. The results suggest that the different devices would suffer comparable power penalties for comparable degrees of wake improvement, but reveal interesting differences in their mode of operation.

• Supplemental Notes:
  • Report
• Corporate Authors:

  National Maritime Institute, Feltham

  Middlesex,   England 

  Mechanical and Electrical Engineering Requirements Board

  ,   England 
• Authors:
  • Gadd, G E
• Publication Date: 1983-5

Media Info

• Features: References;
• Pagination: 28 p.

Subject/Index Terms

• TRT Terms: Flow; Fluid dynamics; Propellers; Racing; Vibration; Wakes
• Uncontrolled Terms: Fluid flow
• Old TRIS Terms: Flow deflectors; Propeller induced vibration; Vortex generators
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00661176
• Record Type: Publication
• Source Agency: Maritime Technical Information Facility
• Report/Paper Numbers: NMI-R157
• Files: TRIS
• Created Date: Jul 21 1994 12:00AM