Products, detonation measured” product compositions

PETN density favors Mader s detonation product computations since, as shown above, Mader calculates that the amount of free carbon decreases with a decrease in PETN packing density The product compns measured by Ornellas (Table 8) and the Mader CJ compositions differ appreciably. The Q s are, however, very similar. The agreement between calorimeter and computed Q s is certainly unexpected in view of the different product compns. Nevertheless, as stated in Vol 7, H38—39, there is rather good agreement between calorimeter Q s for confined samples and the CJ Q s computed by Mader (Ref 40) for expls that are not too deficient in oxygen. The following tabulation illustrates this ... 

The measuring system used for the determination of detonation product composition is shown in Figure 4.75. 

Preceding discussions (in this chapter and Chapter 8) relate to problems attending the measurement of propagation rates in heavy-metal azides. The alternative of calculating the maximum, steady-state detonation rates in these azides from first principles is not well established. Nevertheless, a one-dimensional thermohydrodynamic model does exist which can yield reasonable values for detonation properties (velocity, pressure, product density and composition, particle velocity, etc.) [113-119]. 

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