Losses of electromagnetic energy in compression of a magnetic field by a shock of the second kind

Бармин, А. А.; Melnik, Oleg; Prishchepenko, A. B.; Filippova, O. L.; Shakhbazov, A. Sh.; Shchelkachev, M. V.

doi:10.1007/bf01051833

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…The following step involved allowance for the compressibility of the material and estimation of its influence on results of compression. Numerical modeling schemes were developed by Nagayama [27] and Barmin with collaborators [28]. Nagayama performed calculations using the Mie-Griineisen approximation, and Barmin used approximations for the equation of state based on the theory of a free volume and, in a number of calculations, the model equation of state fitted to empirical data.…”

Section: Compression Of ~K Field With a Materialsmentioning

confidence: 99%

Two alternatives of magnetic cumulation

Bichenkov¹

2000

J Appl Mech Tech Phys

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Section: Compression Of ~K Field With a Materialsmentioning

confidence: 99%

Two alternatives of magnetic cumulation

Bichenkov¹

2000

J Appl Mech Tech Phys

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“…Several more comprehensive models were proposed later [9,14,18,20,21,23,[25][26][27]. These models reduce to MHD equations supplemented by the equation of state of the substance and by the law of variation of electrical conductivity under compression and heating.…”

Section: Introductionmentioning

confidence: 99%

“…The first investigations in this area were performed at the Lavrent'ev Institute of Hydrodynamics of the Siberian Division of the Russian Academy of Sciences (Russia) and at the Kumamoto University (Japan). Further studies of various aspects of shock-wave magnetic cumulation [20][21][22][23][24][25][26][27][28] contributed greatly to the development of the method. An important factor for understanding the method capabilities was the absence of growth of short-wave disturbances of the shock front [24].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of shock-wave magnetic cumulation

Гилев

2008

Combust Explos Shock Waves

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Experiments with aluminum, copper, and silicon powders are performed to study the mechanism of shock-wave magnetic cumulation. For all substances examined, the magnetic field as a function of the cavity area is described by a power dependence with a constant exponent α. The value of α depends substantially on the substance porosity and particle size. For copper and silicon powders and for small-size aluminum powder, the value of α is consistent with the ratio of the particle velocity u to the wave velocity D, as is predicted by a simple model of magnetic cumulation. For the fine and coarse aluminum powders, the value of α is noticeably smaller than the ratio u/D. The lower effectiveness of magnetic compression can be attributed to insufficiently high electrical conductivity (fine powder) and the emergence of conductivity with incomplete compression of the substance (coarse powder). In the first case, diffusion losses of the magnetic flux in the compressed substance are fairly noticeable. In the second case, the work against the magnetic forces is performed by a layer in the shocktransition region, which has a lower particle velocity. The mechanism of magnetic cumulation involves substance metallization under shock compression and expelling of some portion of the magnetic flux to the non-conducting region ahead of the shock front. The two-stage mechanism of cumulation known in the literature (metallization in the elastic precursor and subsequent compression of the field in the main wave) is not validated by experiments with measurements of the particle and wave velocities and electrical conductivity and by experiments on magnetic cumulation.

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In memory of Aleksei Alekseevich Barmin

2011

Fluid Dyn

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Losses of electromagnetic energy in compression of a magnetic field by a shock of the second kind

Cited by 3 publications

References 3 publications

Two alternatives of magnetic cumulation

Two alternatives of magnetic cumulation

Experimental study of shock-wave magnetic cumulation

In memory of Aleksei Alekseevich Barmin

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