Bubble and free surface dynamics in shallow underwater explosion

Li, Jian; Rong, Jili

doi:10.1016/j.oceaneng.2011.09.031

Cited by 39 publications

(18 citation statements)

References 20 publications

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“…Many researchers have studied characteristics of underwater explosion by means of underwater explosion experiment, most of which were carried out in small-scale. [1][2][3] In the experiments, explosive ball is placed in center of transparent water containers which is convenient for streak camera to record photographs. In the bubble pulsation stage, variation of gas-water interface is captured by streak camera and recorded in photos.…”

Section: Introductionmentioning

confidence: 99%

A modified method of characteristics and its application in forward and inversion simulations of underwater explosion

Zhang

Chao

2016

AIP Advances

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This paper introduces a modified method of characteristics and its application in forward and inversion simulations of underwater explosion. Compared with standard method of characteristics which is appropriate to homoentripic flow problem, the modified method can be also used to deal with isentropic flow problem such as underwater explosion. Underwater explosion of spherical TNT and composition B explosives are simulated by using the modified method, respectively. Peak pressures and flow field pressures are obtained, and they are coincident with those from empirical formulas. The comparison demonstrates the modified is feasible and reliable in underwater explosion simulation. Based on the modified method, inverse difference schemes and inverse method are introduced. Combined with the modified, the inverse schemes can be used to deal with gas-water interface inversion of underwater explosion. Inversion simulations of underwater explosion of the explosives are performed in water, and equation of state (EOS) of detonation product is not needed. The peak pressures from the forward simulations are provided as boundary conditions in the inversion simulations. Inversion interfaces are obtained and they are mainly in good agreement with those from the forward simulations in near field. The comparison indicates the inverse method and the inverse difference schemes are reliable and reasonable in interface inversion simulation.

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Section: Introductionmentioning

confidence: 99%

A modified method of characteristics and its application in forward and inversion simulations of underwater explosion

Zhang

Chao

2016

AIP Advances

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“…Figure 6 shows that the radius vs. time and the velocity vs. time curves of the initial bubbles for a 1 kg RDX/AP-based aluminized explosive charge detonated at a depth of 4.7 m, can be derived in accordance with the volume-acceleration model using the law of similarity coefficients of the shock wave [20]. The radius of the bubble increases and the radial velocity abruptly increases within 0.06 ms, before gradually decreasing with time.…”

Section: Simulation Of the Bubblementioning

confidence: 95%

Underwater Explosion Performance of RDX/AP-based Aluminized Explosives

Xiang¹,

Rong²,

He³

et al. 2017

Cent. Eur. J. Energ. Mater.

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Abstract:To understand the underwater explosion (UNDEX) performance of RDX/AP-based aluminized explosives, six formulations of the explosives were prepared, with Al content varying from 30% to 55% and ammonium perchlorate (AP) content from 45% to 20%. A series of UNDEX tests that used a 1 kg cylindrical charge was conducted underwater at a depth of 4.7 m. The pressure histories of the shock wave produced at different positions and the bubble periods were measured. The coefficients of the similarity law equation for the shock wave parameters were fitted with experimental data. The effect of the aluminum/ oxygen (Al/O) ratio on the performance of the energy output structure for RDX/AP-based aluminized explosives is discussed. The bubble motion during UNDEX was simulated using MSC.DYTRAN software, and the radius-time curves of the bubbles were determined. The results show that AP influences the detonation reaction mechanism of RDX/AP-based aluminized explosives, which causes different UNDEX performances. The bubble energy of the RDX/AP-based aluminized explosive was higher than that of RDX-based and HMX-based aluminized explosives.

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“…2) is used (Huang Li et al 2011Li et al , 2014. This system consists of an experiment bench frame, a loading system, and a monitoring system.…”

Section: Experimental Systemmentioning

confidence: 99%

“…Since the 1940s, many scholars have conducted experiments and theoretical studies on water pressure blasting, in which problems of the laws of transmission and attenuation of shock waves in water and bubble pulsation are sufficiently discussed (Li and Rong 2011;Wang 1994;Zhang et al 1998Zhang et al , 2012Menon and Lal 1998;Barras et al 2012;Chai and Liang 2012;Palmstrøm and Skogheim 2000;Hunter 2001). The research is mainly focused on the explosion in certain water areas.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Basic Law of the Fracture Spatial Morphology for Water Pressure Blasting in a Drillhole Under True Triaxial Stress

Huang

2014

Rock Mech Rock Eng

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The present literature on the morphology of water pressure blasting fractures in drillholes is not sufficient and does not take triaxial confining stress into account. Because the spatial morphology of water pressure blasting fractures in drillholes is not clear, the operations lack an exact basis. Using a large true triaxial water pressure blasting experimental system and an acoustic emission 3-D positioning system, water pressure blasting experiments on cement mortar test blocks (300 mm 9 300 mm 9 300 mm) were conducted to study the associated basic law of the fracture spatial morphology. The experimental results show that water pressure blasting does not always generate bubble pulsation. After water pressure blasting under true triaxial stress, a crushed compressive zone and a blasting fracture zone are formed from the inside, with the blasting section of the naked drillhole as the center, to the outside. The shape of the outer edges of the two zones is ellipsoidal. The range of the blasting fracture is large in the radial direction of the drillhole, where the surrounding pressure is large, i.e., the range of the blasting fracture in the drillhole radial cross-section is approximately ellipsoidal. The rock near the drillhole wall is affected by a tensile stress wave caused by the test block boundary reflection, resulting in more flake fractures appearing in the fracturing crack surface in the drillhole axial direction and parallel to the boundary surface. The flake fracture is thin, presenting a small-range flake fracture. The spatial morphology of the water pressure blasting fracture in the drillhole along the axial direction is similar to a wide-mouth Chinese bottle: the crack extent is large near the drillhole orifice, gradually narrows inward along the drillhole axial direction, and then increases into an approximate ellipsoid in the internal naked blasting section. Based on the causes of the crack generation, the blasting cracks are divided into three zones: the blasting shock zone, the axial extension zone, and the orifice influence zone. The explosion shock zone is the range that is directly impacted by the explosive shock waves. The axial extension zone is the axial crack area with uniform width, which is formed when the blasting fracture in the edge of the explosion shock zone extends along the drillhole wall. The extension of the orifice influence zone is very large because the explosion stress waves reflect at the free face and generate tensile stress waves. In the water pressure blasting of the drillhole, the sealing section should be lengthened to allow the drillhole blasting cracks to extend sufficiently under the long-time effect of the blasting stress field of quasi-hydrostatic pressure.

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Bubble and free surface dynamics in shallow underwater explosion

Cited by 39 publications

References 20 publications

A modified method of characteristics and its application in forward and inversion simulations of underwater explosion

A modified method of characteristics and its application in forward and inversion simulations of underwater explosion

Underwater Explosion Performance of RDX/AP-based Aluminized Explosives

Experimental Investigation on the Basic Law of the Fracture Spatial Morphology for Water Pressure Blasting in a Drillhole Under True Triaxial Stress

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