A study on jet flow induced by underwater explosion at a pit-interface

ZHANG Guifu; ZHU Yujian; YANG Jiming

doi:10.11883/bzycj-2016-0238

Volume 38 Issue 2

Jan. 2018

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Article Navigation > Explosion And Shock Waves > 2018 > 38(2): 241-249

ZHANG Guifu, ZHU Yujian, YANG Jiming. A study on jet flow induced by underwater explosion at a pit-interface[J]. Explosion And Shock Waves, 2018, 38(2): 241-249. doi: 10.11883/bzycj-2016-0238

Citation:

ZHANG Guifu, ZHU Yujian, YANG Jiming. A study on jet flow induced by underwater explosion at a pit-interface[J]. Explosion And Shock Waves, 2018, 38(2): 241-249. doi: 10.11883/bzycj-2016-0238

ZHANG Guifu, ZHU Yujian, YANG Jiming. A study on jet flow induced by underwater explosion at a pit-interface[J]. Explosion And Shock Waves, 2018, 38(2): 241-249. doi: 10.11883/bzycj-2016-0238

Citation:

ZHANG Guifu, ZHU Yujian, YANG Jiming. A study on jet flow induced by underwater explosion at a pit-interface[J]. Explosion And Shock Waves, 2018, 38(2): 241-249. doi: 10.11883/bzycj-2016-0238

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A study on jet flow induced by underwater explosion at a pit-interface

doi: 10.11883/bzycj-2016-0238

Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, Anhui, China

Received Date: 2016-08-16
Rev Recd Date: 2017-01-18
Publish Date: 2018-03-25

Abstract

Abstract

In this study we conducted an experiment on the jetting flow induced by underwater wire explosion at an interface with a quasi-static hemispherical pit, in which the interfacial pit was created by the dripping of a liquid drop. Further, using high-speed video photography and Fluent numerical simulation, we revealed the development and features of the jetting flow, tested and verified the applicability of the pit creation method. The experimental results show that the explosion induces a slim and smooth central jet that arises from the bottom of a pit, and a circular side jet arises from the boundary region of the tube, which differs from the known jetting phenomenon without a pit at the surface. Further study reveals the central jet is a result of the energy concentration effect of the pit under impact and the circular side jet is caused by a combined effect of the disturbed initial interface and the friction of the tube wall. Both jets rise with an early constant velocity after a short acceleration process. Examination of the explosion energy indicates that the velocities of the two jets increase linearly with the charging voltage (or equivalently the square root of the explosion energy).The explosion energy barely affects the general feature of the central jet but has a significant influence on the appearance of the side jet.
- jet,
- underwater explosion,
- straight tube,
- falling droplet,
- pit

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References(23)

References

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