Design of Supercavitating Propellers Using a Vortex Lattice Method

概要

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This paper describes a rigorous design method for supercavitating propellers (SCPs). In a previous paper, the circulation distribution and hydrodynamic pitch were calculated by Goldstein's lifting theory. Lifting surface corrections were performed by two kinds of approximate methods. An improved correction method for camber effects was developed, using bi-parabolic polynomials. The correction for pitch including cascade effects was also made using a simple empirical formula obtained from series tests. In the present paper, the lifting surface correction was directly performed using a vortex lattice method. A more accurate circulation distribution was used, which was calculated by Lerbs' lifting line theory.Three SCPs were designed, manufactured and tested in a large cavitation tunnel at the Ship Research Institute. They all generated the required thrust at the design point except the one designed for a higher load condition. The efficiencies obtained are reasonably high for all propellers. It is concluded that the present design method is one of the most promising and reliable tools for designing high performance SCPs.
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