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Underwater continuous pulse shock wave generator

A technology of shock wave and generator, which is applied in the field of explosive applications, can solve the problems of explosive devices that have not yet discovered shock waves, and achieve the effects of rich frequency, convenient manufacture, and low manufacturing cost

Active Publication Date: 2013-11-06
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, no explosive device capable of generating periodic shock waves underwater has been found

Method used

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  • Underwater continuous pulse shock wave generator
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  • Underwater continuous pulse shock wave generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1 uses a long cylindrical metal body with equidistant thread protrusions on the surface and a detonating cord to make a pulse shock wave generator

[0026] see figure 1 , the long metal body 1 used is a solid cylindrical steel column with an outer diameter d 1 = 55mm, the surface has a raised helical thread, pitch s = 16mm, thread height 3mm, thread protrusion width 2mm, steel column length 1m, thread 50 turns in total. The outer diameter of the detonating cord 2 used is 2mm, the internal explosive is RDX, and the charge linear density is 2.7g / m, and the detonation velocity D=8100m / s is measured by "probe method".

[0027] Wind the above detonating cord 2 along the thread protrusion of the long metal body 1, close to the side of the thread protrusion and the surface of the steel column when winding, and wrap 44 times in total to obtain the pulse shock wave generator product.

[0028] According to the formula Calculate the time step T of the pulse shock wa...

Embodiment 2

[0033] Embodiment 2 Using a long metal body with unequal-spaced thread grooves on the surface and a detonating cord to make a pulse shock wave generator

[0034] The long metal body 3 used is a hollow steel column with unequal-spaced helical thread grooves on the surface. Steel column length 1m, outer diameter d 1 =5mm, inner hole diameter 20mm. A total of 40 turns of thread grooves, pitch (That is, the pitch of the first circle is 16mm, the pitch of the last circle is 32mm, and n refers to the thread of the nth circle), the depth of the thread groove is 3mm, and the width is 3mm. The used detonating cord 2 contains explosive PETN with a linear density of 2.3g / m, and its detonation velocity is measured by "probe method" D=8530m / s=8530×1000 / 10 6 mm / us. The detonating cord 2 is wound along the thread groove of the long metal body 3, close to one side when winding, and tightly attached to the surface of the steel column. A total of 40 circles, get as image 3 pulse shock w...

Embodiment 3

[0038] Embodiment 3 uses a conical long metal body and a detonating cord to make a pulse shock wave generator

[0039] The long metal body 3 used is a circular platform, and the material is a solid steel column. Radius r of the upper bottom of the circular platform 1 =30mm, bottom radius r 2 =100mm, height h=1000mm. The surface helical thread has a pitch s=100mm, a total of 11 turns of the thread, a thread height of 20mm, and a width of 15mm. The used detonating cord 2 contains explosive HMX, the linear density is 180g / m, and its detonation velocity D=8900m / s is measured by "probe method". When making the pulse shock wave generator, the detonating cord 2 is wound along the thread of the long metal body 3, close to one side of the thread when winding, and tightly attached to the surface of the steel column. A total of 11 windings, see Figure 4 .

[0040] The formula for calculating the pulse time step of the nth detonating cord of the shock wave generator is:

[0041] ...

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Abstract

The invention belongs to the technical field of explosion application, and more particularly relates to an underwater explosion technology. An underwater continuous pulse shock wave generator comprises a long metal body, wherein a spiral detonating cord is wound on the surface of the long metal body, or a spiral groove or a raised structure is preset on the surface of the long metal body, and the detonating cord is wound on the surface of the long metal body along the groove or the raised side wall; the long metal body is a solid piece or a hollow pipe fitting; and the detonating cord is a metal pipe, a cavity of which is filled with explosive, and the density of the charging line of the detonating cord is 1 to 200 g / m. The generator generates periodical shock wave in underwater explosion. The explosive in the detonating cord has higher output power, so the generated continuous pulse shock waves can reach higher transmitting power; and the shock waves of different frequencies can be obtained by changing the outside diameter of the long metal body and the pitch of the detonating cord wound on the long metal body, so that the frequencies of sound waves contained in the continuous pulse shock wave generator are very abundant and can be set differently as required.

Description

Technical field: [0001] The invention belongs to the technical field of explosion application, and also relates to underwater explosion technology. Background technique: [0002] When the explosive explodes underwater, a shock wave with high pressure will be generated. The speed of the shock wave in water is the sum of the local sound speed and the speed of the water medium. For the water medium with no velocity along the direction of shock wave movement, the velocity of shock wave in water is the same as the local speed of sound (the speed of sound in 258C water is 1500m / s). Although the shock wave moves at the local speed of sound in water, the shock wave generated by the explosion has a very high pressure. As water is an incompressible medium, the shock wave decays very slowly in water. Therefore, the shock wave propagating in water has the characteristics of high pressure, slow attenuation, and propagation at the speed of sound. Due to the short duration of the explosi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D1/00
Inventor 马宏昊范志强沈兆武倪小军
Owner UNIV OF SCI & TECH OF CHINA