Experimental study on effects of nozzles on gas bubble shapes and pressure characteristics of underwater detonation

LI Cheng; HUANG Xiaolong; LI Ning; LIU Wei; WENG Chunsheng

doi:10.11883/bzycj-2022-0268

Volume 43 Issue 3

Mar. 2023

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LI Cheng, HUANG Xiaolong, LI Ning, LIU Wei, WENG Chunsheng. Experimental study on effects of nozzles on gas bubble shapes and pressure characteristics of underwater detonation[J]. Explosion And Shock Waves, 2023, 43(3): 032202. doi: 10.11883/bzycj-2022-0268

Citation:

LI Cheng, HUANG Xiaolong, LI Ning, LIU Wei, WENG Chunsheng. Experimental study on effects of nozzles on gas bubble shapes and pressure characteristics of underwater detonation[J]. Explosion And Shock Waves, 2023, 43(3): 032202. doi: 10.11883/bzycj-2022-0268

Citation:

LI Cheng, HUANG Xiaolong, LI Ning, LIU Wei, WENG Chunsheng. Experimental study on effects of nozzles on gas bubble shapes and pressure characteristics of underwater detonation[J]. Explosion And Shock Waves, 2023, 43(3): 032202. doi: 10.11883/bzycj-2022-0268

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Experimental study on effects of nozzles on gas bubble shapes and pressure characteristics of underwater detonation

doi: 10.11883/bzycj-2022-0268

National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

Received Date: 2022-06-23
Rev Recd Date: 2022-08-22

Available Online: 2022-08-31

Publish Date: 2023-03-05

Abstract

Abstract

A detonation experimental system was established to explore the characteristics of underwater detonation gas jets from the detonation tubes with different types of nozzles. The effects of different types of nozzles on underwater bubble shapes and pressure characteristics during detonation were experimentally studied. The digital particle image velocimetry was used to visualize the bubble pulsation pictures captured by a high-speed camera, and the bubble velocity fields in the different nozzle cases were obtained. Two dynamic pressure sensors were installed at the end of the detonation tube to confirm whether the stable detonation wave was formed, and to observe the transmission and reflection characteristics of the detonation wave on the gas-liquid two-phase interface, respectively. An underwater explosion sensor was installed at a certain distance from the nozzle to measure the underwater pressure wave. The results show that the bubble pulsation process in the divergent nozzle case is basically the same as that in the case of the straight nozzle, but the divergent nozzle improves the gas jet velocity and increases the bubble volume of the first bubble pulsation. The combined effect of the convergent nozzle and its reflected shock wave reduces the injection speed of the detonation gas. Because of the continuity of the gas jet, the bubble pulsation process in the convergent nozzle case is obviously different. The maximum bubble volume in the convergent nozzle case is smaller, but the attenuation of the second bubble pulsation duration is smaller than that of the first pulsation duration. The divergent nozzle increases the gas velocity and kinetic energy, which enhances the bubble pulsation intensity, the bubble pulsation pressure and transmitted shock wave pressure in the divergent nozzle case are much higher than those in the straight nozzle case. The bubble pulsation pressure and the transmitted shock wave pressure in the convergent nozzle case are both low, but the continuity of the convergent nozzle gas jet retards the attenuation speed of the bubble pulsation pressure. Compared with the straight nozzle, the bubble pulsation time in the divergent nozzle case is longer, the bubble pulsation pressure and transmitted shock wave pressure are higher. The duration of the bubble pulsation in the convergent nozzle case is shorter, and the convergent nozzle can obviously inhibit the transmitted shock wave pressure and the bubble pulsation pressure.
- nozzle,
- underwater detonation,
- bubble pulsation,
- bubble shape,
- underwater pressure

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References(26)

References

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