Hydrodynamics and modeling of a ventilated supercavitating body in transition phase

作     者：KIM Seon-Hong KIM Nakwan 

作者机构：Department of Naval Architecture and Ocean Engineering Seoul National University 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2015年第27卷第5期

页      面：763-772页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) the Ministry of Education, Science and Technology (Grant No. NRF2012R1A1A2008633) supported by the Civil-Military Technology Cooperation Program funded by the Civil-Military Technology Cooperation Center (CMTC) (Grant No. 14-BR-EN-31) 

主　　题：entilated supercavity hydrodynamical modeling supercavitating body transition phase cavity closure mode dynamics modeling 

摘      要：Compared to other underwater vehicles, supercavitating vehicles can attain a high speed because they eliminate drag by creating a large cavity, thus establishing the so-called ＂supercavitating condition.＂ Such a cavity is difficult to develop under normal conditions, hence, ventilation is used to attain the supercavitating condition in the initial phase of flight. In this paper, we focus on the hydrodynamic characteristics of a ventilated supercavitating vehicle. First, dynamic modeling of the supercavitating vehicle is performed to calculate the hydrodynamic force/moment acting on the vehicle for a given size of cavity. We then define the relationship between the ventilation rate and the cavitation number based on an air entrainment model of the ventilated cavity. Numerical simulations were performed to analyze the physical feasibility and characteristics of the modeling. The results show that the cavity length/radius increases with the ventilation rate, proving that ventilation can be used to attain the supercavitating condition.