Numerical Analysis of Artificial Supercavitation under the Gravity Effect

Kim, Ji-Hye; Jeong, So-Won; Ahn, Byoung-Kwon

doi:2017.20.5.665

J. KIMS Technol > Volume 20(5); 2017 > Article

Journal of the Korea Institute of Military Science and Technology 2017;20(5):665-672.
DOI: https://doi.org/10.9766/KIMST.2017.20.5.665

Numerical Analysis of Artificial Supercavitation under the Gravity Effect

Ji-Hye Kim, So-Won Jeong, Byoung-Kwon Ahn

Department of Naval Architecture and Ocean Engineering, Chungnam National University

중력 효과를 받는 인공 초공동에 대한 수치해석

김지혜, 정소원, 안병권

충남대학교 선박해양공학과

Abstract

Supercavitation can be generated at relatively lower speeds by injecting compressed air behind the cavitator. As a result, an artificially created supercavity is deformed and its tail tends to rise due to gravitational effects. However, practical prediction of the artificial supercavity currently depends on empirical results. In this study, a mathematical model for the artificial supercavity under the gravity effect is proposed. Based on a boundary element method, geometric characteristics of the supercavity at different flow conditions are examined. The results were compared with an existing empirical formula and also experimental observations carried out at a cavitation tunnel of the Chungnam National University.

Key Words: Cavitator, Artificial Supercavitation, Gravity Effect