Experimental characteristic study on bubble pulsation and jet under cylindrical shell
WU Kailun
YU Fulin
AN Zhanyi
BAO Yongrui
WANG Zhipeng
Abstract：To investigate the dynamic characteristics of underwater explosion bubbles under cylindrical shell structure,an experimental system for bubble pulsation and jet under cylindrical shell is designed.Bubbles are generated using an electric spark generation device,and bubble dynamic characteristic images are captured by a high-speed camera.Pressure sensors are employed to collect data on pressure load variations at the bottom wall of the cylindrical shell,and the influence of the dimensionless parameter γ on the peak pressure and duration of bubble loads are analyzed.Experimental results indicate that when γ is 0.25 and 0.50,the bubble shape is inverted mushroom-shaped to cumulous-shaped;when γ is 0.75 and 1.00,the bubble shape is columnar to cumulous-shaped;when γ is 1.25 and 1.50,the bubble shape exhibits egg-shaped to fan-shaped morphology.For 0.25≤γ≤1.50,the peak pressure of bubble shock wave load decreases with increasing γ,while the duration of shock wave load peak pressure increases with increasing γ;the duration of peak pressure from the first-cycle pulsation and jet load is greater than that of the second-cycle pulsation and jet load.For 0.25≤γ≤0.75,the peak pressures of both first-cycle and second-cycle pulsation and jet loads decrease with increasing γ;for 0.75<γ≤1.00,the peak pressures of both first-cycle and second-cycle pulsation and jet loads increase with increasing γ;for 1.00<γ≤1.50,the peak pressure of first-cycle pulsation and jet load decreases with increasing γ,while the peak pressure of second-cycle pulsation and jet load increases slowly with increasing γ.
Keywords：underwater explosionbubblepulsationjetcylindrical shell
Publication Date：2026-01-31
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：9( 96-104 )