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Some Insights into Air Entrainment Characteristics of Artificial Supercavities

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Document pages: 3 pages

Abstract: Artificial supercavitation is a promising technology for the drag reduction of high-speed underwater vehicles, whereby a cavity is generated through air entrainment. Supercavitation experiments are conventionally done in closed wall water tunnels. In order to properly extend these results to the operation of underwater vehicles under the ocean, it is imperative to understand the underlying physics governing these processes. Thus, in the current study, artificial supercavitation experiments are carried out using small-scale water tunnel experiments with two different experimental models. Systematic studies are carried out using high-speed visualization and measurements of air entrainment at different stages. Our measurements suggest a marked difference of air entrainment behavior between the two models, particularly for formation and sustenance of supercavities. Such differences are explained based on the understanding of fundamental physical factors governing the process, such as bubble breakup, coalescence and the effect of the presence of a body inside the supercavity.

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