EXPERIMENTAL INVESTIGATION OF THE EFFECT OF PROPELLER BLADE PITCH ON PROPELLER-PRODUCED UNSTEADY BEARING FORCES AND MOMENTS
Experimental results are presented to show the effect of pitch-diameter ratio on propeller-produced unsteady loads. Eight three-bladed propellers with changes of equal increments of pitch resulting in pitch-diameter ratios from 0.58 to 1.75 were tested in three-cycle and four-cycle wake screens. The data indicated that, in general, for the same thrust loading coefficient C sub Th, the unsteady thrust and bending moments tend to decrease with increasing pitch whereas the torque increases and the side forces change negligibly. However, it is impracticable to reduce unsteady thrust by altering pitch.
David Taylor Naval Ship R&D CenterBethesda, MD United States 20084
- Valentine, D T
- Kader, R D
- Publication Date: 1976-12
- Pagination: 58 p.
- TRT Terms: Alternatives analysis; Bearings; Bending moments; Diameter; Loads; Mechanical loads; Optimization; Pitch (Dynamics); Propeller blades; Propellers; Ratios; Thrust; Thrust bearings; Torque; Vibration; Wakes
- Old TRIS Terms: Blade pitch modification; Marine propellers; Periodic variations; Propeller loading; Propeller pitch; Propeller thrust; Unsteady loading
- Subject Areas: Marine Transportation; Vehicles and Equipment;
- Accession Number: 00154523
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: DTNSRDC-76-0137 R&D Rpt
- Files: TRIS
- Created Date: May 31 1977 12:00AM