Study on multi-bubble coupling characteristics in underwater explosions under hypergravity conditions

GUO Quanshi; LU Qiang; ZHANG Liangyong; WU Zutang; DING Yang; GUO Zhiyun; FANG Houlin

doi:10.11883/bzycj-2026-0060

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GUO Quanshi, LU Qiang, ZHANG Liangyong, WU Zutang, DING Yang, GUO Zhiyun, FANG Houlin. Study on multi-bubble coupling characteristics in underwater explosions under hypergravity conditions[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2026-0060

Citation:

GUO Quanshi, LU Qiang, ZHANG Liangyong, WU Zutang, DING Yang, GUO Zhiyun, FANG Houlin. Study on multi-bubble coupling characteristics in underwater explosions under hypergravity conditions[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2026-0060

Citation:

GUO Quanshi, LU Qiang, ZHANG Liangyong, WU Zutang, DING Yang, GUO Zhiyun, FANG Houlin. Study on multi-bubble coupling characteristics in underwater explosions under hypergravity conditions[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2026-0060

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Study on multi-bubble coupling characteristics in underwater explosions under hypergravity conditions

doi: 10.11883/bzycj-2026-0060

(National Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi’an 710024, Shaan’xi, China

Received Date: 2026-02-11
Rev Recd Date: 2026-06-16

Available Online: 2026-06-22

Abstract

Abstract

The bubble coupling and morphological evolution characteristics in underwater multipoint explosions have long been a focus of research. Among various research approaches, the centrifuge-based hypergravity underwater explosion experiments have emerged as one of the most effective methods for conducting prototype experiments on large-yield underwater explosions, owing to its simultaneous satisfaction of both the Mach number and the Froude number. This study presents both experimental and numerical investigation into the coupling dynamics of underwater multipoint explosion bubbles under hypergravity conditions. First, two-point underwater explosion experiments were conducted under a hypergravity environment with a acceleration of 100g, and the morphological evolution of dual bubbles was captured with high precision using a high-speed camera. Second, a hypergravity underwater multi-point explosion numerical model, validated against the experimental data, was employed to further investigate the effects of gravitational field on the coupled morphological evolution and characteristic parameters of dual bubbles. The results indicate that under higher gravitational acceleration, the morphological evolution, pulsation, and migration characteristics of underwater explosion bubbles differ significantly from those under normal gravity. This hypergravity environment, as an extreme physical condition, intensifies the pressure gradient and buoyancy effects, leading to unique jetting behaviors. The hypergravity environment increases the vertical pressure gradient in the flow field, enhances the instability on the bubble surfaces, and induces more intense fluid acceleration, thereby leading to higher bubble migration velocities. In addition, the hypergravity field introduces a "spatiotemporal compression effect" on bubble pulsation and alters the buoyancy-inertia force balance of the bubble system, which significantly affects the jetting direction and the interaction intensity between the bubbles, consequently modifying the energy distribution within the dual-bubble system.
- underwater explosion,
- bubble coupling,
- hypergravity,
- bubble pulsation,
- jet

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References(33)

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