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This paper investigates the characteristics of the flow field induced by a supersonic jet at the tail of an underwater axisymmetric vehicles under different pressure ratio conditions, based on the volume of fluid (VOF) multiphase flow model. The study analyzes the evolution of the flow field at the tail of the axisymmetric vehicles and explores the morphological distribution of the induced cavity at various time instances under different pressure ratios. The research findings indicate a close relationship between the jet’s tail cavity morphology and the nozzle pressure ratio. When the pressure ratio is relatively low, the tail cavity exhibits a conical shape similar to the supercavitation. As the pressure ratio increases, the influence of the tail vortex on the jet gradually diminishes, and the high-pressure ratio jet evolves into a pulsating jet under the action of shear entrainment driven by the Kelvin-Helmholtz instability. Within the pulsating jet flow field, phenomena such as “back-attack” and pressure disturbances in the water medium lead to a “positive feedback” effect on the pulsation characteristics of the jet. After the high-pressure ratio jet transforms into a pulsating jet, the degree of jet necking fluctuates significantly with time, and the initial bubble breakup results in a random distribution of the jet necking location with time. With a further increase in pressure ratio, the morphology of the pulsating tail cavity tends to stabilize, and the pressure fluctuation amplitude at the bottom of the axisymmetric vehicles decreases.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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