On an array-sensor technology for measuring bubble jet load generated by underwater explosion

SHENG Zhenxin; LIU Jianhu; ZHANG Xianpi; GAO Tao; CHEN Jiangtao; YANG Jing

doi:10.11883/bzycj-2020-0346

Volume 41 Issue 3

Mar. 2021

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Article Navigation > Explosion And Shock Waves > 2021 > 41(3): 031405

SHENG Zhenxin, LIU Jianhu, ZHANG Xianpi, GAO Tao, CHEN Jiangtao, YANG Jing. On an array-sensor technology for measuring bubble jet load generated by underwater explosion[J]. Explosion And Shock Waves, 2021, 41(3): 031405. doi: 10.11883/bzycj-2020-0346

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SHENG Zhenxin, LIU Jianhu, ZHANG Xianpi, GAO Tao, CHEN Jiangtao, YANG Jing. On an array-sensor technology for measuring bubble jet load generated by underwater explosion[J]. Explosion And Shock Waves, 2021, 41(3): 031405. doi: 10.11883/bzycj-2020-0346

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On an array-sensor technology for measuring bubble jet load generated by underwater explosion

doi: 10.11883/bzycj-2020-0346

China Ship Scientific Research Center, Wuxi 214082, Jiangsu, China

Received Date: 2020-09-22
Rev Recd Date: 2021-01-19

Available Online: 2021-03-05

Publish Date: 2021-03-10

Abstract

Abstract

There are two difficulties in the measurement of underwater explosion bubble jet load: (1) the bubble jet load is a non-uniform surface load, but its radius of action is only 1/10 of the maximum radius of the bubble, the density of sensitive elements which is limited to the size and installation space is low, so it is difficult to accurately obtain the spatial distribution of bubble jet load; (2) the mechanical environment of the sensor is very complex when measuring the bubble jet load, so the sensor is easy to be damaged, which makes it impossible to obtain the complete time history. Therefore, it is difficult to obtain the spatiotemporal distribution characteristics of bubble jet load by existing measurement methods. In view of this, an array sensor was designed. Several small sensitive elements were processed on a piece of PVDF piezoelectric film by special technology. The size of sensitive elements is 5 mm×5 mm, arranged in 8×8 matrix, and the density of sensitive elements is ≥1 cm⁻². At the same time, the sensor protection device was designed on the basis of revealing the damage mechanism of the sensor. The underwater explosion test of small equivalent explosive was carried out in a small observation tank, and the spatiotemporal distribution characteristics of bubble jet load were measured by using array sensor. The results show that: (1) the designed protection device can ensure that the sensor will not be damaged in the process of measuring the bubble jet load; (2) the load in the bubble jet center is the highest and decrease to the surrounding gradually. The peak pressure of the bubble jet load is about 35.6 MPa, which is about 1.16 times of the shock wave peak pressure. The array measurement technology can provide technical support for the in-depth study of underwater explosion bubble jet.
- bubble jet,
- array measurement,
- sensor protection,
- underwater explosion

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References

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