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An experimental investigation of ventilated supercavity under the action of tail jet

机译：An experimental investigation of ventilated supercavity under the action of tail jet

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摘要

Supercavitation is a beneficial method to reduce skin friction of underwater objects. To better predict and control the features of a supercavity under the influence of the tail jet, an experimental study of the supercavity under the tail jet condition is conducted in this paper. In this study, some underwater experiments were conducted in the test channel to observe the cavity appearance and internal flow in an environment with free-surface boundaries in which a body is moving and the fluid is resting. In the present experiments, the periodic gas leakage and ring vortices were observed and investigated the Strohal number of periodic gas leakage, which has rarely been mentioned in previous studies. In addition, the effect of tail-jet ventilation conditions on the natural supercavity was investigated. The findings demonstrate that when the ventilation volume is limited, the water vapor can still maintain its dominance and that gas and water vapor interaction takes place in the cavity's inner layer. After increasing the ventilation amount, the interaction surfaces of gas and water vapor in the cavity become more obvious and dominated by gas. The expansion trend of the cavity also alters as ventilation is increased.

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