THE EFFECTS OF VARIATIONS OF SEVERAL PARAMETERS ON THE WAKE IN WAY OF THE PROPELLER PLANE FOR SERIES 60-0.60 CB MODELS.
The report presents the results of a series of wake surveys conducted on series 60-0.60 CB models with three different afterbody configurations. These tests were conducted with variations of the following parameters: speed, propeller position, displacement, trim, and deadwood area. This presentation includes the circumferential distributions of the longitudinal, tangential, and radial velocity component ratios; the radial distribution of the volumetric mean wake velocity ratio; the radial distribution of the amplitudes of the harmonics of the longitudinal and tangential velocity component ratios; and the radial distribution of the pressure factor and of the mean advance angle and the maximum positive and negative variations thereof. The most pronounced effect was achieved by removing a portion of the deadwood in way of the stern aperture. This alteration yielded a higher mean longitudinal velocity while reducing the harmonic amplitudes. The displacement and speed also had an effect on the wake distribution. The testing of the moderate U-and V-shaped sterns, however, did not indicate changes of the magnitude that were anticipated. ( Author )
Naval Ship Research and Development CenterWashington, DC United States
- Grant, Jerald W
- Lin, Alan CM
- Publication Date: 1969-6
- Pagination: 117 p.
- TRT Terms: Design; Sterns; Wakes
- Old TRIS Terms: Model testing; Stern arrangements; Wake surveys
- Subject Areas: Design; Marine Transportation; Vehicles and Equipment;
- Accession Number: 00001777
- Record Type: Publication
- Source Agency: Defense Documentation Center
- Report/Paper Numbers: NSRDS-3024 R & D Rpt.
- Files: TRIS
- Created Date: Oct 30 1973 12:00AM