THE EFFECT OF PROPELLER SKEW ON THE CAVITY GEOMETRY ON SUCTION SIDE OF BLADES

Four propellers with different skew angle distribution and constant pitch distributions were selected in order to clarify the skew effects on the hydrodynamic characteristics of propeller performance. Using these propellers, the effects of the skew distributions on the propeller open-water characteristics, cavity extents and cavity thickness distributions on the suction side of the propeller blades were investigated in towing tank tests and cavitation tests in uniform flow. The results showed that the increase of the skew angle induces the increase of thrust and torque coefficients, but only slightly changes the efficiency. The cavity extent and thickness near the blade tip also increased in proportion to the increase of the skew angle. The potential-based vortex lattice calculations were carried out to obtain detailed information for the calculation of the flow field around the propeller blades in the non-cavitating condition. Cavity extent and thickness distribution were also calculated by the linearized free streamline theory and compared with the experimental results. These results showed that the propeller loading near the blade tip increases and the loading near the root decreases with the increase of the skew angle. The calculated cavity thickness distributions near the blade tip were underestimated but those of the inner part were overestimated.

• Supplemental Notes:
  • J Kansai Soc Naval Arch, n 220, Sept 1993, p 97 [7 p, 5 ref, 1 tab, 14 fig]
• Authors:
  • OKAMOTO, Y
• Publication Date: 1993

Language

• Japanese

Subject/Index Terms

• TRT Terms: Cavitation (Mechanics); Cavitation erosion; Propellers
• Old TRIS Terms: Propeller efficiency; Skewed propellers
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00706518
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM