A lifting-surface theory and the numerical procedure for design of supercavitating propellers are presented. The method is applied to the design of several supercavitating propellers whose design conditions are the same as those of existing supercavitating propellers. As in the case of a subcavitating propeller, the supercavitating propeller is represented by vortex and source distributions. The source strengths, unlike the subcavitating propeller, are related to the cavity thickness which is not known a priori, and have to be obtained via the solution of related integral equations. The numerical solution of the integral equations is obtained as a correction function to stripwise supercavitating cascade theory which together with lifting-line theory is used for preliminary design of supercavitating propellers. The induced axial, radial, and tangential velocities are obtained on a blade reference surface which allows arbitrary skew, rake, and radial pitch variation. The blade shape is obtained as a correction to the shape obtained from stripwise supercavitating cascade theory. From the pressure on the blade surface, the thrust and torque coefficients are obtained. The computation procedure is tested in a high-speed computer for several existing supercavitating propellers, and the computed results are compared with available experimental results. Reasonably good agreement is obtained. (DePo)
A lifting surface theory of supercavitating propellers
Theorie der Hubflaeche fuer superkavitierende Propeller
1978
17 Seiten, 9 Bilder, 1 Tabelle, 16 Quellen
Conference paper
English
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