Detonation of Condensed Explosives by Roger Cheret

By Roger Cheret

This paintings marks a degree within the evolution of a systematic and technical box which has been built by way of the Commissariat a l'Energie Atomique (CEA) over a number of a long time. Many individuals of the workers of the CEA have received re­ nown during this box, and their paintings has introduced it to the excessive measure of excel­ lence for which it really is across the world famous at the present time. those scientists needed to ponder each element of the sphere, because it involved: modeling, which has recourse to fluid thermodynamics, molecular phys­ ics, and chemistry; numerical review, which is determined by mathematical research and knowledge processing; and experiments within the firing zone, which require particular tension turbines and instrumentation. when this ebook is a testomony to the task and luck of employees of the CEA, it additionally studies a bunch ofthe advances made within the self-discipline. How­ ever, it's not meant to be an exhaustive account of these advances; it truly is assumed that the reader can, if wanted, seek advice the normal monographs, and more moderen, extra really expert works (notably W.C. Davis and W. Fickett, and C.L. Mader). The historical past of the self-discipline is fascinating in itself, and likewise as an illustra­ tion of the reasons which bring about development in a coherent physique of medical paintings. I may still wish to make a few reviews in this growth, of which there's a desirable precis within the creation, and with a view to determine mostly through the work.

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Detonation of Condensed Explosives

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Definition and General Properties The pressure of a fluid as the partial derivative of the mass density e(v, s) of internal energy in relation to the mass volume v was introduced above. 39) where y is a constant greater than 1, which ensures zero energy in infinite dilutions. 41) This definition calls for some important observations: (i) Taking account of the well-known definitions of the speed of sound, a 2 = 46 II. 42) a2 h=-- y - 1" (ii) The entropy s depends only on the product pvi', with the result that the isentropes are in the form pvi' = constant and the coefficient r == - a log pia log v(v, s) equals y.

J. = k k it can be deduced, by multiplying by mk and expanding uJ a - _(pyk) + (pykU~) . + (pykU~) at J . = pk. J ,J As in the above two subsections, a sensible expansion of the first two derivatives leads to p ° ] + (Py k"k) u· . ). J p k. Taking account of the equation of conservation of mass which cancels out the second term, and isolating the flow of mass associated with species k in the mixture the diffusion equations take the form dOyk p __ dt _ + (pkU~) . = pk. 45, k) 3. Continuum Model of the Reactive Fluid 19 They show how the variation of yk in the mixture is linked to diffusion (term pkUJ) and to chemical reaction (term pk).

Consequently, [H+] is the union of (R+) and (H+) and point J is the only C-J detonation point. From what goes before, it can also be held that w < a on the arc [CJ] (strong detonations), and w > a on the arc [BJ] (weak detonations). Finally, Jl. being the smallest value of Jl for which (R~) cuts (H+), and also therefore the smallest value of M on (H+), it can be concluded that the value D. 15) is the smallest value which w0 can have on (H+). (Po + Po)(vo - vo), from which hA(D) = eo - eA > O. Furthermore, let us consider the straight line (R~; Jl = poaA) and its current point R.

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