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Keywords = supercavitating torpedo

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27 pages, 3255 KiB  
Review
A Review on Research of Load Reduction and Ballistic Stability During Cross-Media Water Entry Processes
by Qingxia Lu, Xiaojian Ma, Jing Zhao and Lin Shen
J. Mar. Sci. Eng. 2025, 13(4), 703; https://doi.org/10.3390/jmse13040703 - 1 Apr 2025
Viewed by 743
Abstract
The cross-media water entry problem widely exists in fields such as ocean engineering and aerospace. The highly non-stationary characteristics of the cross-media water entry process significantly influence the structural strength and ballistic stability of vehicles. This paper selects air-dropped torpedoes, supercavitating vehicles, and [...] Read more.
The cross-media water entry problem widely exists in fields such as ocean engineering and aerospace. The highly non-stationary characteristics of the cross-media water entry process significantly influence the structural strength and ballistic stability of vehicles. This paper selects air-dropped torpedoes, supercavitating vehicles, and high-speed projectiles as three typical types of cross-media vehicles for study. Based on their unique structural characteristics and typical water entry conditions, this paper focuses on the current status of their respective impact load and load reduction challenges, as well as water entry ballistic stability issues. At the research methodological level, this paper systematically reviews the progress of current research in three directions: theory, experiments, and numerical simulations, and introduces the application of artificial intelligence in solving cross-media problems. Finally, this paper looks forward to future development trends in cross-media water entry research, aiming to provide a reference for structural optimization design, motion stability control, and other related studies of cross-media vehicles. Full article
(This article belongs to the Section Ocean Engineering)
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14 pages, 3842 KiB  
Article
Cavitator Design for Straight-Running Supercavitating Torpedoes
by Min-Jae Kim, Seon-Hong Kim, Kurn-Chul Lee, Bu-Geun Paik and Moon-Chan Kim
Appl. Sci. 2021, 11(14), 6247; https://doi.org/10.3390/app11146247 - 6 Jul 2021
Cited by 5 | Viewed by 5121
Abstract
A practical cavitator design method for straight-running-type supercavitating torpedoes was developed in this paper. Design requirements were first drawn in terms of torpedo performance characteristics, such as maximum range and motion stability. This method determines the optimum cavitator satisfying the design requirements that [...] Read more.
A practical cavitator design method for straight-running-type supercavitating torpedoes was developed in this paper. Design requirements were first drawn in terms of torpedo performance characteristics, such as maximum range and motion stability. This method determines the optimum cavitator satisfying the design requirements that not only minimize the total drag of the torpedo, extending the maximum range, but also provide hydrodynamic forces required for straight level flight. The design procedure includes determining a design cavitation number and cavitator type (disk or cone) for obtaining the optimal cavitator that minimizes the total drag of a torpedo in straight level flight. To determine such an optimal cavitator, the equations of force and moment equilibrium for straight level flight were iteratively solved by the existing mathematical models that determine the cavity shapes generated by disk- and cone-shaped cavitators and hydrodynamic forces acting on the vehicle. For validation, model experiments on a small-scale supercavitating vehicle were conducted in a towing tank, and the results agree well with those of the mathematical models used in this study. A preliminary design based on the newly proposed method was also implemented for a realistic supercavitating vehicle. More precise computations using CFD should be conducted to investigate the physics in more detail in the near future. Full article
(This article belongs to the Special Issue Energy Saving Devices in Ship)
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