Numerical Analysis of the Drag of Conical Cavitators

- Journal title : Journal of the Society of Naval Architects of Korea
- Volume 52, Issue 4, 2015, pp.305-314
- Publisher : The Society of Naval Architects of Korea
- DOI : 10.3744/SNAK.2015.52.4.305

Title & Authors

Numerical Analysis of the Drag of Conical Cavitators

Kim, Hyoung-Tae; Lee, Hyun-Bae; Cho, Jung-Kyu;

Kim, Hyoung-Tae; Lee, Hyun-Bae; Cho, Jung-Kyu;

Abstract

In this paper, a numerical analysis is carried out to study the drag of conical cavitators, supercavity generation devices for the high-speed underwater vehicle. The realizable k-∊ turbulence model and the Schnerr-Sauer cavitation model are applied to calculate steady-state supercavitating flows around cones of various cone angles. The calculated drags of the cones are decomposed of the pressure and the friction parts and their dependency on the geometry and the flow conditions have been analyzed. It is confirmed that the pressure drag coefficients of the cones can be estimated by a simple function of both the cone angle and the cavitation number while the friction drag coefficients approximately by well-known empirical formulas, e.g., Schults-Grunow's for the drag of the flat plate. Finally a practical method for estimating the total drags of supercavitating cones is suggested, which can be useful consequently for the design of conical cavitaors.

Keywords

Supercavitating flows;Conical cavitators;Drag;

Language

Korean

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