Experimental study and numerical simulation on bubble pulsation and water jet in near-field underwater explosion

WEN Yanbo; HU Liangliang; QIN Jian; ZHANG Yanze; WANG Jinxiang; LIU Liangtao; HUANG Ruiyuan

doi:10.11883/bzycj-2021-0206

Volume 42 Issue 5

May 2022

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WEN Yanbo, HU Liangliang, QIN Jian, ZHANG Yanze, WANG Jinxiang, LIU Liangtao, HUANG Ruiyuan. Experimental study and numerical simulation on bubble pulsation and water jet in near-field underwater explosion[J]. Explosion And Shock Waves, 2022, 42(5): 053203. doi: 10.11883/bzycj-2021-0206

Citation:

WEN Yanbo, HU Liangliang, QIN Jian, ZHANG Yanze, WANG Jinxiang, LIU Liangtao, HUANG Ruiyuan. Experimental study and numerical simulation on bubble pulsation and water jet in near-field underwater explosion[J]. Explosion And Shock Waves, 2022, 42(5): 053203. doi: 10.11883/bzycj-2021-0206

Citation:

WEN Yanbo, HU Liangliang, QIN Jian, ZHANG Yanze, WANG Jinxiang, LIU Liangtao, HUANG Ruiyuan. Experimental study and numerical simulation on bubble pulsation and water jet in near-field underwater explosion[J]. Explosion And Shock Waves, 2022, 42(5): 053203. doi: 10.11883/bzycj-2021-0206

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Experimental study and numerical simulation on bubble pulsation and water jet in near-field underwater explosion

doi: 10.11883/bzycj-2021-0206

1.
State Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
College of Civil Engineering, Fuzhou University, Fuzhou 350116, Fujian, China
3.
Aerospace System Engineering Shanghai, Shanghai 201109, China
4.
Naval Academy, Beijing 100161, China

Received Date: 2021-05-25
Rev Recd Date: 2021-08-23

Available Online: 2022-05-06

Publish Date: 2022-05-27

Abstract

Abstract

In marine warfare, the water jets formed by near-field underwater explosions can cause serious local damage to ship structures. With more knowledge on near-field underwater explosions, the phenomenon of water jet has become a hot research topic in recent years. To study the formation mechanism of water jet during near-field explosion under the bottom of a ship, an underwater explosion experiment was carried out, in which 2.5 g of TNT was detonated under the bottom of a clamped square plate at different explosion distances. A high-speed camera was used to record the evolution of the bubble jet. At the same time, a free-field underwater pressure sensor was used to measure the pressure field in the water tank. The experimental results show that with the increase of the burst distance, the process of bubbles evolving to form jets at the bottom of the square plate can be divided into two types; that is, the adsorption type and non-adsorption type. Then, by employing ABAQUS software andusing the CEL method, a series of numerical simulations were carried out for the experiment. The numerical simulation results show that the critical point for the conversion from the adsorption jet to the non-adsorption jet is between 0.821 times the maximum bubble radius and 0.867 times the maximum bubble radius. Because the upper part of the bubble is difficult to expand freely under the barrier of the steel plate, the corresponding burst distance when the bubble is adsorbed is smaller than the maximum bubble radius. By analyzing the velocity cloud diagram at the jet being formed, it is found that with the increase of the burst distance, because the clamped square plate accelerates the process of bubble collapse, the time of jet formation is advanced. The maximum velocity during the formation process of water jet and the velocity when water jet hits the steel plate both increase first and then decrease with the increase of the burst distance, reaching the maximum near the critical point. The maximum jet velocity can reach 621 m/s, the maximum jet velocity when jet hits the steel plate can reach 269 m/s. Because the larger the burst distance, the later the bubble collapses, and the more concentrated the energy in the bubble, which makes the jet velocity larger, but when the burst distance is too large, the Bjerknes effect of the steel plate on the bubble will be weakened, which will reduce the jet velocity. Consequently, a critical point of the burst distance exists, at which the jet velocity renders a maximum.
- underwater explosion,
- water jet,
- burst distance,
- adsorption jet,
- bubble collapse

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References(32)

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