INFLUENCES OF SKEW BACK OF PROPELLER AND WAKE DISTRIBUTIONS ON HULL PRESSURE FLUCTUATIONS CAUSED BY CAVITATING PROPELLERS

This paper deals with the influences of skew back of propeller and wake distributions on hull pressure fluctuations caused by cavitating propellers. Three model propellers with different skew angles were tested in a cavitation tunnel in the same model wake distribution. The extent of cavity, the cavity thickness distributions and the pressure fluctuation on the flat plate above the propeller were measured and compared with the calculation results based on linearized free stream line theory combined with unsteady lifting surface theory. The influence of the scale effect of wake distributions on the propeller cavitation and the hull pressure fluctuation were investigated by the same calculation method comparing the full scale and model scale data of Seiun-Maru. The results of the experiments showed the increase in the cavity thickness near the propeller tip passing through the high wake region as the increase of skew angle. The calculations estimated thicker cavity thickness near mid span region and thinner cavity thickness near the tip region than the experiments. The thicker cavity thickness due to the skew back could not be simulated by the calculations. The pressure amplitudes of the full scale ship could be reasonably estimated taking the scale effect of wake distributions into account, except for the case of a highly skewed propeller.

  • Supplemental Notes:
    • J Kansai Soc Naval Arch, n 223, March 1995, p 35 [8 p, 12 ref, 3 tab, 10 fig]
  • Authors:
    • OKAMOTO, Y
  • Publication Date: 1995

Language

  • Japanese

Subject/Index Terms

Filing Info

  • Accession Number: 00710942
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM