NUMERICAL ANALYSIS OF UNSTEADY OPEN WATER CHARACTERISTICS OF MARINE PROPELLERS BY SURFACE VORTEX LATTICE METHOD

This paper considers the application of the surface vortex lattice method(VLM) to marine propellers in non-uniform flow. Using the surface VLM based on the general vortex lattice method it is possible to simulate the flow around a lifting body including thickness and volume effects by distributing horse-shoe vortices and surface source distributions on both side surfaces of the blades. The advantage of this method compared to other panel methods is that the Kutta- condition is satisfied automatically in not only the steady condition but also the unsteady condition by convecting the trailing and the shed vortices. The geometry of the wake using the linear wake model having the geometrical pitch of blades and all shed vortices are convected to new positions step by step with a small time interval. Three propellers are used to confirm the accuracy of the results. The fluctuation of the thrust and the torque coefficients of a propeller in harmonic wake are calculated to compare the time derivative term with the results by VLM, and the pressure distribution on the blade concerning two full scale propellers are calculated. The results of these calculations are in good agreement with experimental results and other theoretical calculations.

  • Supplemental Notes:
    • J Soc Naval Arch Japan, v 178, Dec 1995, p 71 [11 p, 13 ref, 2 tab, 19 fig]
  • Authors:
    • Yamasaki, H
    • Ikehata, M
  • Publication Date: 1995

Language

  • Japanese

Subject/Index Terms

Filing Info

  • Accession Number: 00727993
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Nov 4 1996 12:00AM