Experimental research on the free surface effect of shock wave and bubble behavior of small yield underwater explosion

FANG Houlin; LU Qiang; GUO Quanshi; LI Guoliang; LIU Cunxu; TAO Sihao; ZHANG Dezhi

doi:10.11883/bzycj-2024-0003

Volume 44 Issue 8

Aug. 2024

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Article Navigation > Explosion And Shock Waves > 2024 > 44(8): 081444

FANG Houlin, LU Qiang, GUO Quanshi, LI Guoliang, LIU Cunxu, TAO Sihao, ZHANG Dezhi. Experimental research on the free surface effect of shock wave and bubble behavior of small yield underwater explosion[J]. Explosion And Shock Waves, 2024, 44(8): 081444. doi: 10.11883/bzycj-2024-0003

Citation:

FANG Houlin, LU Qiang, GUO Quanshi, LI Guoliang, LIU Cunxu, TAO Sihao, ZHANG Dezhi. Experimental research on the free surface effect of shock wave and bubble behavior of small yield underwater explosion[J]. Explosion And Shock Waves, 2024, 44(8): 081444. doi: 10.11883/bzycj-2024-0003

Citation:

FANG Houlin, LU Qiang, GUO Quanshi, LI Guoliang, LIU Cunxu, TAO Sihao, ZHANG Dezhi. Experimental research on the free surface effect of shock wave and bubble behavior of small yield underwater explosion[J]. Explosion And Shock Waves, 2024, 44(8): 081444. doi: 10.11883/bzycj-2024-0003

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Experimental research on the free surface effect of shock wave and bubble behavior of small yield underwater explosion

doi: 10.11883/bzycj-2024-0003

Northwest Institute of Nuclear Technology, Xi’an 710024, Shaanxi, China

Received Date: 2024-01-02
Rev Recd Date: 2024-06-30

Available Online: 2024-07-01

Publish Date: 2024-08-05

Abstract

Abstract

In order to study the effects of free surface on underwater explosion shock wave, bubble behavior and water plumes formed by strong coupling between bubble and free surface, a small yield pentaerythritol tetranitrate (PETN) spherical charge near water surface underwater explosion experimental system was designed, five typical conditions of underwater explosion experiments were carried out, and the evolution process of bubble and water plumes, as well as time history of pressure at the gauge were obtained by high-speed camera and pressure sensor respectively. Based on the characteristics of shock waves and bubble time series, their free surface effects were analyzed separately. The shock wave mainly manifests as truncation effects. The interaction between bubble and free surface is manifested as complex bubble evolution and water plume generation and evolution, which were mainly analyzed through high-speed images, appropriately combined with pressure values. The free surface effects of the bubble were further quantitatively analyzed by the horizontal radius of the bubble, the offset displacement of the bubble, and the maximum height of water plume. The results show that with the decrease of the detonation depth , the difference of the surface reflection wave path decreases, and the truncation effect of the free surface on shock wave increases, that is, the time of the positive pressure of shock wave decreases, and the maximum deviation between the measured truncation time difference and the calculated time difference is 6.81%. With the decrease of the scaled detonation depth, the free surface effects increase, and the shapes of bubble and water plumes become more complicated. The bubble evolves from a sphere to an oval shape, even more complex shapes. The water plume gradually changes from a single water spike to a complex form such as a water spike-top splash column, a water spike-vertical jet column-water jet, etc. The change of the horizontal radius of the bubble no longer retain pulsation characteristics from the second pulsation period to the first pulsation period and even to the first bubble expansion stage. The offset displacement of the center of the bubble’s horizontal radius shows a two-stage variation law, and in the early rapidly-increasing stage (0–20 mm), the offset displacements at 4 scaled detonation depths show a linear variation law, and the linear coefficients are close.
- underwater explosion,
- shock wave,
- bubble behavior,
- free surface effect

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