Evolution Properties of Tail Cavity Oscillation of Underwater Launched Vehicle

doi:10.3969/j.issn.1000-1093.2021.08.017

Abstract

Abstract: In order to investigate the evolution characteristic of tail cavity formed by underwater vertical launch vehicle, as well as the influence of tail cavity on the hydrodynamics and upstream flow of the vehicle, an axisymmetric boundary element code based on potential flow theory was developed to analyze the transient flow field of vehicle with tail cavity. A numerical simulation was performed. The simulated results show that the oscillation of tail cavity has a significant influence on the upstream pressure, the drag force on wet surface and the upstream nose cavity. The oscillation of tail cavity can cause the upstream surface pressure to superimpose a certain amplitude of pressure fluctuations while dropping with the environmental static pressure. The pressure fluctuations are approximately exponentially distributed in space. The closer the position is from the tail cavitation, the greater the pressure fluctuation is. The oscillation of tail cavity makes the resistance of the wetted area of the vehicle show a trend of gradual increase during the oscillation; the oscillation of tail cavity can cause a slower evolution speed of shoulder cavity than that in the non-oscillation state, and the pressure inside the cavity and the peak end retroreflective pressure are larger.

Key words: underwatervehicle, potentialflow, boundaryelementmethod, tailcavityoscillation, underwaterlaunch

CLC Number:

TJ762.4⁺1

QUAN Xiaobo， YOU Tianqing， ZHANG Chenxing， WANG Fanyu， KONG Decai. Evolution Properties of Tail Cavity Oscillation of Underwater Launched Vehicle[J]. Acta Armamentarii, 2021, 42(8): 1728-1734.

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